| GOTO Takuya |  |
| Faculty of Science and Engineering Department of Environmental Systems Science | |
| Professor |
Last Updated :2025/01/02
Researcher Profile and Settings
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Research Areas
Degree
Published Papers
- Electrochemical synthesis of C2 and C3 hydrocarbons from CO2 on an Ag electrode in DEME-BF4 containing H2O and metal hydroxides
Saya Nozaki; Yuta Suzuki; Takuya Goto
Electrochimica Acta, Elsevier BV, 493 144431 - 144431, Jul. 2024, Scientific journal - High-efficient acetylene synthesis by selective electrochemical formation of CO2-derived CaC2
Yuta Suzuki; Seiya Tanaka; Takashi Watanabe; Takane Tsuchii; Tomohiro Isogai; Akiyoshi Yamauchi; Yosuke Kishikawa; Takuya Goto
Chemical Engineering Journal, Elsevier BV, 153013 - 153013, Jun. 2024, Scientific journal - New Route of Acetylene Synthesis via Electrochemical Formation of Metal Carbides from CO2 in Chloride Melts
Yuta Suzuki; Seiya Tanaka; Takashi Watanabe; Tomohiro Isogai; Akiyoshi Yamauchi; Yosuke Kishikawa; Takuya Goto
ACS Sustainable Chemistry & Engineering, American Chemical Society (ACS), 25 Jan. 2024, Scientific journal - Preface for the 69th Special Feature — “Frontiers of Molten Salts and Ionic Liquids”
Toshiyuki NOHIRA; Yasushi KATAYAMA; Takuya GOTO; Tetsuya TSUDA
Electrochemistry, 2024, Scientific journal - Electrochemical and spectroscopic study on corrosion behavior of Ni-based alloys in chloride melts: Materials for an integral molten salt fast reactor
Yuta Suzuki; Takashi Watanabe; Takuya Goto
Nuclear Engineering and Design, 415, 15 Dec. 2023, Scientific journal - Electrodeposition of Carbon from CO2 in Room-Temperature Ionic Liquid Triethylpentylphosphonium Bis(trifluoromethanesulfonyl)imide
Shoma Tchorap-Yamamoto; Yuta Suzuki; Seiya Tanaka; Hidekazu Kobatake; Takuya Goto
Journal of The Electrochemical Society, The Electrochemical Society, 15 Sep. 2023, Scientific journal - Direct Electrochemical Formation of Carbonaceous Material from CO2 in LiCl-KCl Melt
Yuta Suzuki; Tsubasa Takeda; Takuya Goto
Electrochimica Acta, Elsevier BV, 142464 - 142464, Apr. 2023, Scientific journal - 溶融塩電気化学によるCO₂資源化の試み—CO₂ Utilization by Molten Salt Electrolysis—特集 カーボンニュートラルに貢献する表面技術
後藤 琢也
表面技術 = Journal of the Surface Finishing Society of Japan, 表面技術協会, 73(12) 592 - 597, Dec. 2022 - Microscopic Corrosion Process and Electrochemical Properties of JLF-1 Steel (Fe-9Cr-2W) in the Molten Salt LiF-NaF-KF
Gaku Yamazaki; Yuta Suzuki; Takuya Goto; Takuya Nagasaka; Daisuke Nagata; Jingjie Shen; Kazuki Saito; Takashi Watanabe
Fusion Science and Technology, Informa UK Limited, 77(7-8) 766 - 772, 17 Nov. 2021, Scientific journal - Mode-selective excitation of an infrared-inactive phonon mode in diamond using mid-infrared free electron laser
Rei Akasegawa; Heishun Zen; Kan Hachiya; Kyohei Yoshida; Takuya Goto; Takashi Sagawa; Hideaki Ohgaki
Japanese Journal of Applied Physics, IOP Publishing, 60(10) 102001 - 102001, 01 Oct. 2021, Scientific journal - Electrochemical measurements of the corrosion of pure Fe and JLF-1 steel in HF-containing molten FLiNaK salt
Gaku Yamazaki; Takuya Nagasaka; Juro Yagi; Takuya Goto; Teruya Tanaka; Takashi Watanabe; Akio Sagara
Fusion Engineering and Design, Elsevier BV, 162 112134 - 112134, Jan. 2021, Scientific journal - Raman Spectroscopy for Determination of Silicon Oxyfluoride Structure in Fluoride Melts
Yuta Suzuki; Taebyung Park; Kan Hachiya; Takuya Goto
Journal of Fluorine Chemistry, Elsevier BV, 238 109616 - 109616, Oct. 2020, Scientific journal - Two-photon selective excitation of phonon-mode in diamond using mid-infrared free-electron laser
Oji Sato; Kyohei Yoshida; Heishun Zen; Kan Hachiya; Takuya Goto; Takashi Sagawa; Hideaki Ohgaki
Physics Letters, Section A: General, Atomic and Solid State Physics, 384(10), Apr. 2020, Scientific journal - Interfacial phenomena associated with Li electrodeposition on liquid Ga substrates in propylene carbonate
Y. Suzuki; Y. Fukunaka; T. Goto
Electrochemistry Communications, 100 20 - 25, Mar. 2019, Scientific journal - Electrochemical Cs removal and crystal formation from Fukushima weathered biotite in molten NaCl-CaCl2
M. Honda; T. Goto; Y. Sakanaka; T. Yaita; S. Suzuki
AIMS Electronics and Electrical Engineering, American Institute of Mathematical Sciences (AIMS), 3(2) 102 - 110, 2019, Scientific journal - Effects of oxide ions on the electrodeposition process of silicon in molten fluorides
Yuta Suzuki; Yosuke Inoue; Masayuki Yokota; Takuya Goto
Journal of the Electrochemical Society, ELECTROCHEMICAL SOC INC, 166(13) D564 - D568, 2019, Scientific journal - Electrodeposition of nanocrystalline nickel embedded with inert nanoparticles formed via inverse hydrolysis
Febe Merita; Daisuke Umemoto; Motohiro Yuasa; Hiroyuki Miyamoto; Takuya Goto
Applied Surface Science, 458 612 - 618, 15 Nov. 2018, Scientific journal - Hydrogen inventory control for vanadium by Ti metal powder mixing in molten salt FLiNaK
Juro Yagi; Akio Sagara; Takuya Nagasaka; Teruya Tanaka; Takuya Goto; Sadatsugu Takayama; Takeo Muroga
FUSION ENGINEERING AND DESIGN, ELSEVIER SCIENCE SA, 124 748 - 751, Nov. 2017, Scientific journal - Electrodeposition of Si in molten LiF-NaF-KF mixed with various sized SiO
2 particles
Y. Suzuki; M. Yokota; Y. Sakanaka; Y. Fukunaka; T. Goto
ECS Transactions, 80(10) 823 - 831, 2017, International conference proceedings - New route of the formation of ordered FeNi by electrochemical nitriding and de-nitriding processes
Y. Sakanaka; E. Watanabe; Y. Hayashi; T. Goto
Journal of the Electrochemical Society, 164(14) E525 - E528, 2017, Scientific journal - Electrodeposition of porous Si film from SiO
2 in molten BaCl2 -CaCl2 -NaCl
Yoshihide Sakanaka; Akira Murata; Takuya Goto; Kan Hachiya
Journal of Alloys and Compounds, ELSEVIER SCIENCE SA, 695 2131 - 2135, 2017, Scientific journal - Nanocrystalline nickel dispersed with hydrolyzed nano-size tungsten oxide particles by electrodeposition
Tomoki Mifune; Yushi Kato; Hiroyuki Miyamoto; Hiroshi Fujiwara; Takuya Goto
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, The Japan Institute of Metals and Materials, 80(2) 109 - 113, 2016, Scientific journal - Electrodeposition of Si film on Ag substrate in molten LiF-NaF-KF directly dissolving SiO
2
Yoshihide Sakanaka; Takuya Goto
Electrochimica Acta, 164 139 - 142, 10 May 2015, Scientific journal - Electrochemical formation of Ca-Si in molten CaCl
2 -KCl
Y. Sakanaka; T. Goto; Kan Hachiya
Journal of the Electrochemical Society, 162(4) D186 - D191, 2015, Scientific journal - "溶融塩の物性―イオン性無機液体の構造，熱力学，輸送現象の微視的側面":田巻 繁 著（アグネ技術センター）
後藤 琢也
材料, 公益社団法人 日本材料学会, 63(9) S12 , 2014 - Boron-Doped Diamond Electrodes in Molten Chloride Systems
Takuya Goto; Yuya Kado; Rika Hagiwara
Molten Salts Chemistry, 187 - 205, Aug. 2013, In book - Thermodynamic and kinetic properties of oxide ions in a LiCl-KCl-CsCl eutectic melt
Yuya Kado; Takuya Goto; Rika Hagiwara
Journal of the Electrochemical Society, 160(9), 2013, Scientific journal - Plasma-Induced Molten Salt Electrolysis to Form Functional Fine Particles
Yasuhiko Ito; Tokujiro Nishikiori; Takuya Goto
Molten Salts and Ionic Liquids: Never the Twain?, 169 - 180, 03 Jul. 2012, In book - Nanocrystalline nickel dispersed with nano-size WO
3 particles synthesized by electrodeposition
H. Miyamoto; S. Takehara; T. Uenoya; H. Fujiwara; T. Goto
Journal of Materials Science, 47(12) 4798 - 4804, Jun. 2012, Scientific journal - Electrodeposited nanocrystalline nickel dispersed with Nano-Size WO
3 particles
Hiroyuki Miyamoto; Shota Takehara; Toshiyuki Uenoya; Hiroshi Fujiwara; Takuya Goto
Materials Transactions, 53(5) 1026 - 1028, 2012, International conference proceedings - Thermodynamics of the O
2 /O2- redox couple in molten (LiCl + KCl + Li2 O) systems
Yuya Kado; Takuya Goto; Rika Hagiwara
Journal of Chemical Thermodynamics, 42(10) 1230 - 1233, Oct. 2010, Scientific journal - Magnesium silicide film on a silicon substrate prepared by electrochemical method in LiCl-KCl
Goto Takuya; Hachiya Kan; Hagiwara Rika
Trans. Mat. Res. Soc. Japan, The Materials Research Society of Japan, 35(1) 77 - 80, 2010 - Behavior of a Boron-Doped Diamond Electrode in Molten Chlorides Containing Oxide Ion
Yuya Kado; Takuya Goto; Rika Hagiwara
Green Energy and Technology, 44 234 - 239, 2010, Scientific journal - Electrochemical properties of alkali bis(trifluoromethylsulfonyl)amides and their eutectic mixtures
Keigo Kubota; Kenichiro Tamaki; Toshiyuki Nohira; Takuya Goto; Rika Hagiwara
Electrochimica Acta, PERGAMON-ELSEVIER SCIENCE LTD, 55(3) 1113 - 1119, 01 Jan. 2010, Scientific journal - Fundamental Studies on O_2 Gas Evolution Reaction with Molten Salt Electrolysis
GOTO Takuya; NOHIRA Toshiyuki; HACHIYA Kan; HAGIWARA Rika; FUKUNAKA Yasuhiro; WAKATSUKI Takao; TAKAYANAGI Masahiho; YODA Shinichi
JASMA : Journal of the Japan Society of Microgravity Application, 26(4) 352 - 352, 19 Oct. 2009 - Stability of a boron-doped diamond electrode in molten chloride systems
Yuya Kado; Takuya Goto; Rika Hagiwara
Diamond and Related Materials, 18(9) 1186 - 1190, Sep. 2009, Scientific journal - Selected topics of molten fluorides in the field of nuclear engineering
Takuya Goto; Toshiyuki Nohira; Rika Hagiwara; Yasuhiko Ito
Journal of Fluorine Chemistry, 130(1) 102 - 107, Jan. 2009, Scientific journal - Oxygen electrode reaction in a LiCl-KCl eutectic melt
Yuya Kado; Takuya Goto; Rika Hagiwara
Journal of the Electrochemical Society, 156(11), 2009, Scientific journal - Binary and ternary mixtures of MFSA (M = Li, K, Cs) as new inorganic ionic liquids
Keigo Kubota; Toshiyuki Nohira; Takuya Goto; Rika Hagiwara
ECS Transactions, 16(24) 91 - 98, 2009, International conference proceedings - Transport in molten LiF-NaF-ZrF
4 mixtures: A combined computational and experimental approach
Mathieu Salanne; Christian Simon; Henri Groult; Frédéric Lantelme; Takuya Goto; Abdeslam Barhoun
Journal of Fluorine Chemistry, ELSEVIER SCIENCE SA, 130(1) 61 - 66, Jan. 2009, Scientific journal - Dissolution behavior of lithium oxide in molten LiCl-KCl systems
Yuya Kado; Takuya Goto; Rika Hagiwara
Journal of Chemical and Engineering Data, 53(12) 2816 - 2819, 11 Dec. 2008, Scientific journal - Novel inorganic ionic liquids possessing low melting temperatures and wide electrochemical windows: Binary mixtures of alkali bis(fluorosulfonyl)amides
Keigo Kubota; Toshiyuki Nohira; Takuya Goto; Rika Hagiwara
Electrochemistry Communications, 10(12) 1886 - 1888, Dec. 2008, Scientific journal - Ternary phase diagrams of alkali bis(trifluoromethylsulfonyl)amides
Keigo Kubota; Toshiyuki Nohira; Takuya Goto; Rika Hagiwara
Journal of Chemical and Engineering Data, AMER CHEMICAL SOC, 53(9) 2144 - 2147, Sep. 2008, Scientific journal - A rechargeable lithium metal battery operating at intermediate temperatures using molten alkali bis(trifluoromethylsulfonyl)amide mixture as an electrolyte
Atsushi Watarai; Keigo Kubota; Masaki Yamagata; Takuya Goto; Toshiyuld Nohira; Rika Hagiwara; Koichi Ui; Naoaki Kumagai
Journal of Power Sources, ELSEVIER SCIENCE BV, 183(2) 724 - 729, 01 Sep. 2008, Scientific journal - Thermal properties of mixed alkali bis(trifluoromethylsulfonyl)amides
Rika Hagiwara; Kenichiro Tamaki; Keigo Kubota; Takuya Goto; Toshiyuki Nohira
Journal of Chemical and Engineering Data, AMER CHEMICAL SOC, 53(2) 355 - 358, Feb. 2008, Scientific journal - Development of new intermediate temperature molten salts and their electrochemical applications
野平 俊之; 後藤 琢也; 萩原 理加
Molten salts, 電気化学会溶融塩委員会, 51(1) 148 - 154, 2008 - Electrochemical behavior of oxide ion in a LiCl-NaCl- CaCl
2 eutectic melt
Yuya Kado; Takuya Goto; Rika Hagiwara
Journal of the Electrochemical Society, 155(7), 2008, Scientific journal - XPS study and optical properties of Si films electrodeposited in a room-temperature ionic liquid
Yusaku Nishimura; Yasuhiro Fukunaka; Toshiyuki Nohira; Takuya Goto; Kan Hachiya; Tetsuo Nishida; Rika Hagiwara
ECS Transactions, 13(10) 37 - 52, 2008, International conference proceedings - Optical properties of thin-film magnesium silicide prepared by electrochemical process
Kan Hachiya; Takuya Goto; Rika Hagiwara
Electrochimica Acta, 53(1) 46 - 49, 20 Nov. 2007, Scientific journal - Morphologic and crystallographic studies on electrochemically formed chromium nitride films
Koji Amezawa; Takuya Goto; Hiroyuki Tsujimura; Yoshiharu Uchimoto; Rika Hagiwara; Yoichi Tomii; Yasuhiko Ito
Electrochimica Acta, PERGAMON-ELSEVIER SCIENCE LTD, 53(1) 122 - 126, 20 Nov. 2007, Scientific journal - 溶融塩関連分野での応用(2) : 高温溶融塩
後藤 琢也
電気化学および工業物理化学 : denki kagaku, 公益社団法人 電気化学会, 75(11) 901 - 905, 05 Nov. 2007 - Development of a zirconium recycle process from zircaloy waste of a Boiling Water Reactor (BWR)
Reiko Fujita; Hitoshi Nakamura; Yoshiko Haruguchi; Ryota Takahashi; Kazuhiro Utsunomiya; Mitsuyoshi Sato; Yasuhiko Ito; Takuya Goto; Takayuki Terai; Satoru Ogawa
Transactions of the Atomic Energy Society of Japan, Atomic Energy Society of Japan, 6(3) 343 - 357, Sep. 2007, Scientific journal - Electrolytic synthesis of ammonia from water and nitrogen under atmospheric pressure using a boron-doped diamond electrode as a nonconsumable anode
Tsuyoshi Murakami; Toshiyuki Nohira; Yasuhiro Araki; Takuya Goto; Rika Hagiwara; Yukio H. Ogata
Electrochemical and Solid-State Letters, ELECTROCHEMICAL SOC INC, 10(4) E4 - E6, 2007, Scientific journal - 溶融ハロゲン化物中における酸化物および窒化物の電気化学挙動
後藤 琢也
溶融塩および高温化学, 電気化学会溶融塩委員会, 49(2) 75 - 81, 2006 - Structural and optical properties of LiZnN prepared by electrochemical formation in a LiCl-KCl-Li
3 N melt
Kazuaki Toyoura; Takuya Goto; Kan Hachiya; Rika Hagiwara
Journal of the Electrochemical Society, 153(1), 2006, Scientific journal - Oxygen gas evolution on boron-doped diamond electrode in molten chloride systems
Takuya Goto; Yasuhiro Araki; Rika Hagiwara
Electrochemical and Solid-State Letters, 9(2), 2006, Scientific journal - Electrochemical deposition of metal nitride films in a molten chloride system
Takuya Goto; Aiko Niki; Hiroyuki Tsujimura; Yasuhiko Ito
Proceedings - Electrochemical Society, PV 2004-24 964 - 969, 2006, International conference proceedings - Thermodynamics of the N
2 /N3- redox couple in a LiBr-KBr-CsBr melt
Katsutoshi Kobayashi; Hironori Nakajima; Takuya Goto; Yasuhiko Ito
Journal of Physical Chemistry B, 109(50) 23972 - 23975, 22 Dec. 2005, Scientific journal - Optical properties of zinc nitride formed by molten salt electrochemical process
Kazuaki Toyoura; Hiroyuki Tsujimura; Takuya Goto; Kan Hachiya; Rika Hagiwara; Yasuhiko Ito
Thin Solid Films, 492(1-2) 88 - 92, 01 Dec. 2005, Scientific journal - Structural and optical properties of magnesium nitride formed by a novel electrochemical process
Kazuaki Toyoura; Takuya Goto; Kan Hachiya; Rika Hagiwara
Electrochimica Acta, 51(1) 56 - 60, 05 Oct. 2005, Scientific journal - Electrolytic ammonia synthesis from water and nitrogen gas in molten salt under atmospheric pressure
Tsuyoshi Murakami; Toshiyuki Nohira; Takuya Goto; Yukio H. Ogata; Yasuhiko Ito
Electrochimica Acta, 50(27) 5423 - 5426, 20 Sep. 2005, Scientific journal - Electrochemistry of nitrogen and nitrides in molten salts
Yasuhiko Ito; Takuya Goto
Journal of Nuclear Materials, 344(1-3) 128 - 135, 01 Sep. 2005, International conference proceedings - Zirconium recovery process for spent zircaloy components from Light Water Reactor (LWR) by electrorefining in molten salts
Reiko Fujita; Hitoshi Nakamura; Koji Mizuguchi; Mitsuyoshi Sato; Takayuki Shibano; Yasuhiko Ito; Takuya Goto; Takayuki Terai; Satoru Ogawa
Electrochemistry, 73(8) 751 - 753, Aug. 2005, Scientific journal - Electrochemical nitriding of Sn in LiCl-KCl-Li
3 N systems
Takuya Goto; Yasuhiko Ito
Journal of Physics and Chemistry of Solids, 66(2-4) 418 - 421, Feb. 2005, International conference proceedings - Electrochemical formation of AlN in molten LiCl-KCl-Li
3 N systems
Takuya Goto; Takayuki Iwaki; Yasuhiko Ito
Electrochimica Acta, 50(6) 1283 - 1288, 2005, Scientific journal - Thermodynamic investigations of nitrogen electrode reaction in a LiCl-KCl-CsCl Melt
Katsutoshi Kobayashi; Hironori Nakajima; Takuya Goto; Yasuhiko Ito
Journal of the Electrochemical Society, 152(7), 2005, Scientific journal - Development of zirconium recovery process for zircaloy claddings and channel boxes from boiling water reactors by electrorefining in molten salts
R. Fujita; H. Nakamura; Y. Haruguchi; R. Takahashi; M. Sato; T. Shibano; Y. Ito; T. Goto; T. Terai; S. Ogawa
Proceedings of the American Nuclear Society - International Congress on Advances in Nuclear Power Plants 2005, ICAPP'05, 6 3429 - 3436, 2005, International conference proceedings - Formation and control of zinc nitride in a molten LiCl-KCl-Li
3 N system
Takuya Goto; Kazuaki Toyoura; Hiroyuki Tsujimura; Yasuhiko Ito
Materials Science and Engineering A, 380(1) 41 - 45, 25 Aug. 2004, Scientific journal - Electrochemical surface nitriding of pure iron by molten salt electrochemical process
Hiroyuki Tsujimura; Takuya Goto; Yasuhiko Ito
Journal of Alloys and Compounds, 376(1-2) 246 - 250, 11 Aug. 2004, Scientific journal - Growth kinetics of nitrided layers on stainless steels during electrochemical nitriding in molten LiCl-KCl-Li
3 N systems
H. Tsujimura; T. Goto; Y. Ito
Journal of New Materials for Electrochemical Systems, 7(3 SPEC. ISS.) 221 - 230, Jul. 2004, Scientific journal - Electrochemical surface nitriding of zirconium in LiCl-KCl-Li
3 N systems
Takuya Goto; Hajime Ishigaki; Yasuhiko Ito
Materials Science and Engineering A, 371(1-2) 353 - 358, Apr. 2004, Scientific journal - Surface nitriding of SUS 304 austenitic stainless steel by a molten salt electrochemical process
Hiroyuki Tsujimura; Takuya Goto; Yasuhiko Ito
Journal of the Electrochemical Society, 151(8), 2004, Scientific journal - Electrochemical nitriding of cobalt by molten salt electrochemical process
Hiroyuki Tsujimura; Takuya Goto; Yasuhiko Ito
Journal of the Electrochemical Society, 151(9), 2004, Scientific journal - Electrochemical surface nitriding of SUS 430 ferritic stainless steel
Hiroyuki Tsujimura; Takuya Goto; Yasuhiko Ito
Materials Science and Engineering A, 355(1-2) 315 - 319, 25 Aug. 2003, Scientific journal - Anode discharge electrolysis of molten LiCl-KCl system
T. Oishi; T. Goto; Y. Ito
Journal of the Electrochemical Society, 150(1), Jan. 2003, Scientific journal - Formation of carbon nitride by anode-discharge electrolysis of molten salt
T. Oishi; T. Hattori; T. Goto; Y. Ito
Journal of the Electrochemical Society, 149(11), Nov. 2002, Scientific journal - Formation of metal oxide particles by anode-discharge electrolysis of a molten LiCl-KCl-CaO system
T. Oishi; T. Goto; Y. Ito
Journal of the Electrochemical Society, 149(11), Nov. 2002, Scientific journal - Formation of transition metal sulfide particles by anode discharge electrolysis of molten LiCl-KCl-KSCN system
Tetsuo Oishi; Takuya Goto; Yasuhiko Ito
Electrochemistry, 70(9) 697 - 700, Sep. 2002, Scientific journal - Electrochemical formation and control of chromium nitride films in molten LiCl-KCl-Li
3 N systems
Hiroyuki Tsujimura; Takuya Goto; Yasuhiko Ito
Electrochimica Acta, 47(17) 2725 - 2731, 05 Jul. 2002, Scientific journal - Formation of III-V nitrides by molten salt electrochemical process
T Goto; Y Ito
PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON MOLTEN SALT CHEMISTRY AND TECHNOLOGY, SHANGHAI UNIV, 126 - 129, 2001, International conference proceedings - Effect of absorbed hydrogen on surface nitriding by molten salt electrochemical process
T. Nishikiori; T. Nohira; T. Goto; Y. Ito
Electrochemical and Solid-State Letters, 3(12) 552 - 554, Dec. 2000, Scientific journal - Electrochemical formation of iron nitride film in a molten LiCl-KCl-Li
3 N system
Takuya Goto; Ryoji Obata; Yasuhiko Ito
Electrochimica Acta, 45(20) 3367 - 3373, 23 Jun. 2000, Scientific journal - Acceleration of electrochemical titanium nitride growth by addition of LiH in a molten LiCl-KCl-Li
3 N system
T. Nishikiori; T. Nohira; T. Goto; Y. Ito
Electrochemical and Solid-State Letters, 2(6) 278 - 280, Jun. 1999, Scientific journal - Electrochemical reduction of nitrogen gas in a molten chloride system
Takuya Goto; Yasuhiko Ito
Electrochimica Acta, 43(21-22) 3379 - 3384, 01 Jul. 1998, Scientific journal - 溶融塩系での窒素およびその化合物の電気化学
伊藤 靖彦; 後藤 琢也
溶融塩および高温化学, 電気化学協会溶融塩委員会, 41(2) 137 - 148, May 1998 - Electrochemical behavior of nitride ions in a molten chloride system
Takuya Goto; Masayuki Tada; Yasuhiko Ito
Journal of the Electrochemical Society, 144(7) 2271 - 2276, Jul. 1997, Scientific journal - Electrochemical reduction of N
2 gas and its application to energy systems
Yasuhiko Ito; Takuya Goto
Proceedings of the Intersociety Energy Conversion Engineering Conference, 2 787 - 792, 1997, International conference proceedings - The implantation of Si and formation of silicide by molten salt electrochemical process
T. Ueda; T. Goto; Y. Ito
Hyomen Gijutsu/Journal of the Surface Finishing Society of Japan, The Surface Finishing Society of Japan, 46(12) 1173 - 1179, 1995, Scientific journal - Electrochemical surface nitriding of titanium in molten salt system
T. Goto; M. Tada; Y. Ito
Electrochimica Acta, 39(8-9) 1107 - 1113, Jun. 1994, Scientific journal - Surface Nitriding of Titanium by Electrochemical Process.
GOTO Takuya; TADA Masayuki; ITO Yasuhiko
Jitsumu Hyomen Gijutsu, The Surface Finishing Society of Japan, 44(7) 643 - 644, 1993
MISC
- OS1102 Strength and thermal properties of nanocrystalline Ni-WOx by electrodeposition
MIYAMOTO Hiroyuki; KATO Yushi; MIFUNE Tomoki; FUJIWAEA Hiroshi; GOTO Takuya
M&M材料力学カンファレンス, The Japan Society of Mechanical Engineers, 2014 "OS1102 - 1"-"OS1102-3", 19 Jul. 2014 - High-Temperature Electrochemical Synthesis for Energy Conversion Materials (第49回同志社大学理工学研究所研究発表会 2011年度学内研究センター合同シンポジウム 講演予稿集)
GOTO Takuya; ITO Yasuhiko
同志社大学理工学研究報告, 同志社大学理工学研究所, 52(4) 106 - 110, Jan. 2012 - ナノ構造エネルギー変換貯蔵デバイスの非平衡電気化学プロセシング
Fukunaka Yasuhiro; Homma Takayuki; Hagiwara Rika; Nohira Toshiyuki; Hachiya Kan; Matsuoka Toshifumi; Liang Yunfeng; Goto Takuya; Yasuda Hideyuki; Matsushima Hisayoshi; Kishimoto Naoki; Ito Tomonori; Takahashi Yasuo; Kinoshita Kyoichi; Takayanagi Masahiro; Sone Yoshitsugu; Ishikawa Takehiko; Wakatsuki Takao; Nishikawa Kei; Yoda Shinichi
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS), (27) 227 - 230, Mar. 2011 - 331 Making of oxide dispersion nano crystal Ni by electrodeposition
竹原 翔太; 宮本 博之; 後藤 琢也
学術講演会講演論文集, 日本材料学会, 60 219 - 220, 2011 - Advanced functional films prepared by electrochemical process and their physico-chemical properties (第47回同志社大学理工学研究所研究発表会 2009年度学内研究センター合同シンポジウム 講演予稿集)
後藤 琢也; 伊藤 靖彦
同志社大学理工学研究報告, 同志社大学理工学研究所, 50(4) 89 - 93, Jan. 2010
Research Projects
- Study on air revitalization using CO2 electrolysis aiming for high O2 recovery rate
Sakurai Masato
In this study, we investigated the possibility of extracting oxygen and electrolyzing CO2 at low temperature by utilizing carbon production by electrolysis of CO2 in ionic liquid. In order to saturate the ionic liquid with CO2 gas, CO2 gas was introduced into the ionic liquid at 1 atm. From the results of cyclic voltammetry in a 25:75 mol% mixture of [DEME] [TFSI] and [BMIM] [BF4], a reduction current was observed at a negative potential of -0.5 V or higher. The current was thought to correspond to the electrochemical reduction of CO2 in the melt. Constant potential electrolysis was performed in the range of －0.8V to －1.0V, and the obtained sample was measured using SEM and EDS. As a result, carbon was detected in the sample obtained by electrolysis at -1.0 V., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2018/04 -2022/03, Grant-in-Aid for Scientific Research (C), Japan Aerospace EXploration Agency - Electrochemical formation Si film in LiF-KF
Goto Takuya
Electrochemical formation of silicon film has been studied in LiF-KF. The silicon nucleation process has been observed after conducting potentiostatic electrolysis at 0.7 V for 0.0002 seconds. The numbers of nucleation sites have increased with increasing the electrolysis durations. We confirmed that dendrites formation of silicon by prolonging the electrolysis times., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2015/04 -2018/03, Grant-in-Aid for Scientific Research (C), Doshisha University - Development of new insoluble oxygen evolution ceramic electrode used for electrolysis in molten salts
HIROTA KEN; KATO Masaki; GOTO Takuya
The present applicants focused attention on a metal oxide of spinel FeAl2O4 as the insoluble oxygen evolution electrodes at high temperatures. To improve both the electrical conductivity and the durability in the molten salts, the present applicants have synthesized solid solution Fe1+Al2O4 ceramics by controlling the content of Fe from the chemical stoichiometry of 1. Their electrical resistivity ρ of spinel Fe1+δAl2O4 ceramics was much reduced from 1.46 x10∧4 (δ=0) to 4.46 x10∧0 Ω・m (δ=0.45) with increasing δ value. Some physical and chemical properties of the present spinel ceramics have been investigated from the viewpoints of the anode electrode for oxygen generating in the molten fluoride salts during electrolyzing test. The possibility of Fe1.25Al2O4 being used as non-consumable anode electrode is suggested and usability of oxide electrodes is recognized., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2013/04 -2016/03, Grant-in-Aid for Scientific Research (B), Doshisha University - Electrochemical formation of diamond
GOTO Takuya; HACHIYA Kan
Diamond has discriminative properties, such as electrical insulator and super high hardness material, and diamond plays a greater role not only in jewelry but also in industrial use. Electrochemical formation of diamond has been developed by anodic reaction of carbide ion according to the reaction: C_2^<2-> → 2C + 2e^-. In particular, the effects of applied potential on the carbon morphology and the initial stage of carbon formation were investigated. Polyhedral shape of carbon was obtained at more positive potential than 2.4 V on Au wire. The polyhedral shape of carbon was determined as diamond by Raman spectroscopy. Results of chronoamperometry and SEM observation implied that double layer charging and carbon formation occur simultaneously., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2011 -2013, Grant-in-Aid for Scientific Research (C), Doshisha University - Development of energy conversion and storage devices of the next generation using ionic liquids
HAGIWARA Rika; NOHIRA Toshiyuki; GOTO Takuya
Ionic liquids with high conductivity and excellent electrochemical stability have been developed and successfully applied for the electrolytes of fuel cells operating at middle-ranged temperatures without humidification, electrochemical capacitors, rechargeable lithium and sodium batteries operating at middle-ranged temperatures., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2008 -2012, Grant-in-Aid for Scientific Research (A), Kyoto University - Comprehensive study on material damage mechanism by experimental and theoretical methods and development of materials for high-energy quantum-beam field
KAWAI Masayoshi; WATANABE Seiichi; KOKAWA Hiroyuki; KAWASAKI Akira; HASEGAWA Akira; KURISHITA Hiroaki; KIKUCHI Kenji; YOSHIIE Toshimasa; KAMIYAMA Takashi; HARA Nobuyoshi; YAMAMURA Tsutomu; FUTAKAWA Masatoshi; FUKAHORI Tokio; SAITO Shigeru; MAEKAWA Katsuhiro; ITO Takahiro; GOTO Takuya; SATO Koichi; HASHIMOTO Satoshi; TERASAWA Michitaka; WATANABE Yukinobu; XU Chao-Nan; ISHINO Shiori; SHIBAYAMA Tamaki; SAKAGUCHI Norihito; SHIMAKAWA Satoshi; NAO Takashi; IWASE Hiroshi; KANEKO Yoshihisa; KISHIDA Ippei; TAKENAKA Nobuyuki; NAKAI Kiyomichi
The material in a high energy intense proton beam field receives damage due to an intense thermal shock and radiation. A shock damage process and influence were investigated experimentally and the easing method was drawn. Moreover, the simulation code which evaluates a radiation trauma theoretically was developed. Furthermore, our grain boundary engineering method has succeeded the four times increase in corrosion resistivity of various austenite stainless steels. New tungsten material developed with a ultra-fine grain powder has four times higher toughness than that of commercial tungsten and does ductility even at a room temperature. The quantitative method using the stress luminescence material in a shock experiment was devised to improve a material dynamics study., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2007 -2010, Grant-in-Aid for Scientific Research (S), High Energy Accelerator Research Organization - Low dimensional ionic liquids with high conductivities and breaking-up voltages
HAGIWARA Rika; GOTO Takuya; NOHIRA Toshiyuki; KOHARA Shinji; SAITO Yuria
Fluorohydrogenates of cyclic ammonium cations such as 1,3-dialkylimidazolium and N,N-dialkylpyrrolidinium, Cat(FH)_nF (n < 2.3), exhibit excellent stability without liberating HF at ambient condition. Oligo-fluorohydrogenate anions FHF^-, (FH)_2F^- and/or (FH)_3F^- co-exist in the salt changing the composition to give the corresponding n values. These anions exchange HF among them rapidly to give a single signal of ^1H- and ^<19>F-NMR even at -40℃. These salts possess low viscosities in the order of 10^0 to 10^1 cP and high ionic conductivities of 10^1 to 10^2 mS cm^<-1>. A phase diagram of l-ethyl-3-methylimidazolium fluorohydrogenates, EMIm(FH)_nF, has been constructed in the composition range of n= 1 to 2.6. The liquidus temperatures of lower than 25℃ are observed for the salts with n >1.3. Viscosity, conductivity and the results of PGSE-NMR studies characterize the fast ion conduction of these salts affected by the association of the ions in the salt. The cathode limit is the reduction of fluorohydrogenate ions to evolve hydrogen. The anode limit is the oxidation of the cation which shifts depending on the electrochemical stability of them. As a result, the electrochemical windows of these ionic liquids fall in the range of 3 to 5 volts. The applications of these fluorohydrogenates have been studied as the electrolytes of electrochemical devices such as dye-sensitized solar cells, electric double layer capacitors and fuel cells operating at intermediate temperatures (more than 100℃) without humidification., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2004 -2006, Grant-in-Aid for Scientific Research (B), Kyoto University - イオン性液体とポリマーのコンポジットを電解質に用いる無加湿型燃料電池
萩原 理加; 後藤 琢也; 野平 俊之
本年度は昨年度の動作原理の確認に引き続き、新しいコンセプトのイオン液体燃料電池の発電性能の向上にむけた研究に着手した。イオン液体をヒドロキシエチルメタクリレートモノマーと混合し、均一な溶液を作り、これを支持体である多孔質フィルムに含浸させ、重合開始剤を加えて熱重合させることにより、イオン液体とポリマーのコンポジット膜を作成した。組成を変えて重合させることにより、ポリマーのイオン液体保持力および機械的強度について膜組成の最適化を行い、重量比で約50対50を得た。また熱測定により、この膜が120℃でも重量減少がなく、安定であり、フッ化水素などの遊離も起こらないことを確認した。この電解質フィルムと集電体および触媒が一体となったMEAを作成した。これをガス流路付きのセパレータではさんだ試験セルを構成し、発電試験をおこなったところ、無加湿条件(H_2およびO_2 1atm、25℃)において、セル電圧0.5V、電流密度100mA cm^<-2>(出力密度50mW cm^<-2>)の発電性能が得られた(7th International Symposium on Molten Salt Chemistry and Technology, Toulouse, France, 8/29-9/2(2005)にて発表)。この値は、現在までに報告されているプロトン伝導性イオン液体のコンポジット膜による燃料電池と比較した場合、10倍以上である。さらに、100℃の無加湿条件下においても、少なくとも同程度の出力が得られることを確認した。なお本研究申請時に使われていた「イオン性液体」の用語は最近「イオン液体」に変わりつつあり、学術的にもより適切な用語であると考えられるので、当報告ではタイトルは申請時のままにしているが、本文中は新しい用語に改めている。, 日本学術振興会, 科学研究費助成事業, 2004 -2005, 萌芽研究, 京都大学 - 新規な機能性ノンストイキオメトリックナイトライドの創製
後藤 琢也
平成16年度までに、形成のモデルケースとして、電気化学インプランテーションによるアルミニウム窒化、亜鉛窒化物、スズ窒化物の形成を行い、形成条件と得られる窒化物の構造的特性・電子状態との相関を明らかにし、新規な窒化物半導体薄膜の創製手法を確立した。このような結果を踏まえ、平成17年度は、溶融LiCl-KCl中(450℃)におけるマグネシウム窒化物の形成とその物性評価を行った。まず、熱力学的考察により、LiCl-KCl中(450℃)におけるMg-N系の電位-pN3-図を作成し、Mg3N2化合物の熱力学的な安定電位領域を明らかにした。次に、窒化リチウム(Li3N)を添加したLiCl-KCl中(450℃)において、マグネシウム電極を用いてサイクリックボルタンメトリーを行い、電極挙動を明らかにするとともに、実際の窒化物形成電位に関する知見を得た。さらに、マグネシウム電極を用いて、種々の電位で定電位電解を行い、得られたサンプルをX線回折法により分析した。その結果、0.3V vs.Li+/Liより卑な電位領域では、Mg-Li合金が形成することを明らかにした。また、0.4-0.8V vs.Li+/Liにおいては、黄色のMg3N2化合物薄膜が形成することを確認した。また、この化合物薄膜の紫外可視領域の反射率測定を行った結果、バンドギャップが、直接遷移型を仮定した場合3.15eV、間接遷移型を仮定した場合2.85eVとなることを明らかにした。, 日本学術振興会, 科学研究費助成事業, 2003 -2005, 若手研究(A), 京都大学 - 溶融塩を用いる先進的窒化物燃料再処理プロセスのための化学的・電気化学的研究
伊藤 靖彦; 野平 俊之; 後藤 琢也; 萩原 理加
窒化物燃料乾式再処理法の工学的な適応性評価を行うために必要不可欠となる、LiCl-KCl系をはじめとする種々の溶融塩中での窒素およびその化合物に関する熱力学的および速度論的基礎データの集積を行うことを目的とした研究を平成15年度に行った。 1)まずプロセスの熱力学的な観点からの可能性を検討するために、使用済み窒化物燃料に含まれると考えられる全ての化学種(金属、金属イオン、窒化物、酸窒化物等)について、窒素ガス分圧、窒化物イオン濃度と電位で整理する電位-pN^<3->図を作成した。ここでは、申請者らが既に求めた、溶融LiCl-KCl中での窒化物イオンの化学ポテンシャルを利用し、さらに、既存の熱化学データと組み合わせることで図の作成が可能となった。実際のプロセスを考える上で、様々な温度での電位-pN^<3->図が必要となるため、窒素ガス電極を用いて、広い温度範囲で測定を行い、窒化物イオンの化学ポテンシャル、エントロピー、エンタルピーなどを求めた。 2)模擬使用済み窒化物として、希土類窒化物を電気化学的に溶融塩中で形成した。さらに、得られた窒化物の溶解電位をサイクリックボルタンメトリーにより求めた。 3)これらと並行して、溶融LiCl-KCl系での実験ノウハウを駆使して、低温系の溶融アルカリハライド塩(LiCl-KCl-CsCl, LiBr-KBr-CsBr)を用いて、まず、窒化物イオンに関する電気化学挙動の検討を行う。これらの実験を通して、各溶融塩系における窒化物イオンの化学ポテンシャルや、エンタルピー、エントロピーを実験的に決定する。得られたデータをもとに、各溶媒中での平衡論的検討を行った。 以上の基礎的研究を通じて、窒化物燃料の乾式再処理に必要な基礎的データの指針が得られた。, 日本学術振興会, 科学研究費助成事業, 2002 -2003, 萌芽研究, 京都大学 - Novel ambient temperature molten fluorides Scale up of syntheses and application to electrochemical systems
HAGAIWARA Rika; MOMOTA Kunitaka; GOTO Takuya; NOHIRA Tashiyuki
Room temperature molten salts have received an attention for their excellent characteristics from the viewpoint of electrochemical and synthetic applications. In 1999, we developed a new ionic liquid, 1-ethyl-3-methylimidazolium fluorohydrogenate, EMIm(HF)_<2.3>F, having a high ionic conductivity (100 mScm^<-1>). In a series of studies supported by this grant, we have reported some studies on their physical and chemical properties, and practical applications for electrolytes of some electrochemical systems. EMIm(HF)_<2.3>F is prepared by metathesis of starting chloride and anhydrous hydrogen fluoride. EMImHF_2 prepared by thermal decomposition of EMIm(HF)_<2.3>F is a colorless crystalline solid at room temperature. The reaction of the salt with stoichiometric amount of aHF gives EMIm(HF)_nF (1 - Electrochemical Implantation/displantation
ITO Yasuhiko; NOHIRA Toshiyuki; GOTO Takuya; HAGIWARA Rika
We succeeded in constructing anew electrolysis cell in an argon glove box having a gas purification equipment. By using this apparatus, we conducted anodic electrolysis at various kinds of metal electrodes in a molten LiCI-KCl-Li:3N system at 723-773 K to nvestigate the electrochemical implantation of nitrogen. We succeeded in the formations of Ti-N, Fe-N, Al-N, Zr-N, Ga-N, Cr-N, Zn-N, SUS 430-N, SUS304-N. It was found that the addition of LiH to the melt is effective to accelerate the formation rate of the nitrides. It is a characteristic of this method to be able to control the nitrogen concentration in nitrides by electrolysis potential. In addition, the rate controlling process in the nitride growth was found to be the diffusion of nitrogen atoms in the nitride layer since the growth obeyed the parabolic rate law. We also investigated the electrochemical implantation of various rare earths (RE) into some transition metal substrates, which was conducted by eathodic polarization of the transition metal electrodes in molten LiCI-KCI-RECI3 systems, where RE = Y, La, Ce, Pr, Nd, Sin, Gd, Tb, Dy, Er and Yb. We found that some selected alloy phases, i.e., Ni_2Y, Ni_2La, Ni_2Ce, Ni_2Pr, Ni_2Nd, Ni_2Sm, Ni_2Dy, Ni_2Yb, CoGd:_3, Pd_3Y, Pd_3La, Pd_3Ce and Si_2Er, are formed quite rapidly. According to the transmission electron microscopy, the cause of the rapid formation was indicated to be due to the fast diffusion of atoms near the grain boundaries. When the.rapidly formed rare earth alloys were anodically polarized in the same melt, it was possible to dissolve only the rare earth elements from the electrodes, which was termed "electrochemical displantation". For the electrochemical, displantation, rare earth concentrations in the alloys can be controlled by electrolysis potential and quantity of electricity., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2000 -2003, Grant-in-Aid for Scientific Research (B), KYOTO UNIVERSITY - 電気化学インプランテーションによる窒化物形成
後藤 琢也
平成13年度は、電気化学インプランテーションによる窒化物薄膜形成のモデルケースとして、2元系窒化物のCr-N、Al-Nおよび3元系窒化物のFe-Sm-Nに関して、電気化学パラメータと得られる窒化物の相関を明らかにすることを第一の目的とした。その結果、Cr-Nに関しては、窒素濃度も、電解電位が貴である試料ほど、高くなることが分かった。即ち、電気化学インプランテーションを用いることで、電解電位により不定比性の遷移金属窒化物中の窒素濃度を、容易に制御出来ることが示せた。 次に、形成させた窒化物薄膜についてXPS、X線回折、DTA、SEMなどを併用して、本手法による窒化物形成メカニズムの解明を行った。その結果、吸着窒素の化学ポテンシャルが、形成した窒化物中での窒素原子の拡散速度および、表面形態等に影響を与えていることが分かった。また、窒化アルミニウムについてフォトルミネッセンス測定したところ、可視光領域に発光が観測された。このことは、本プロセスにより得られた窒化アルミニウムに欠陥が導入されたことを示唆する結果であり、不定比型遷移金属窒化物のみならず窒化アルミニウム等の典型金属窒化物に欠陥を導入することが出来うる有用な方法であることが明らかとなった。また、3元系窒化物についても、電解電位を種々変化させることにより、それぞれの電位に対応した3元系の窒化物を得ることが出来ることが分かった。 これらの研究と並行して、窒素ガスの陰極還元反応を利用した高効率なナイトライドイオンの供給を可能とする窒素ガス電極を目指し、電極材料と構造に関し検討を行った。具体的には、平成12年度の研究で分極特性が優れていることが明らかとなったニッケル多孔質を電極基体に用い、これに触媒となる金属を担持することで、庚なるガス電極の性能向上を目的とする実験を行った。その結果、ニッケル多孔質電極に白金族微粒子を極微量単担持することで、未担持ニッケルと比較して約5倍程度分極特性が向上した。, 日本学術振興会, 科学研究費助成事業, 2000 -2001, 奨励研究(A), 京都大学 - 凝縮プラズマ系下の金属-超軽元素化合物生成機構の基礎的解明
冨井 洋一; 雨澤 浩史; 桑原 秀行; 高田 潤; 野平 俊之; 後藤 琢也
昨年度に引き続き、以下に示す予定の2小研究項目を遂行し、以下の成果を得た。 1.凝縮プラズマ系反応による、非平衡物質の創製と高機能性およびマイクロキャラクタリゼーション 前年度のTi-N系での成果を踏まえて、Al-Ti-C系の物質創製が試みられた。 Al-Ti-C系は、AlTiやAl_3Ti等の化合物を高温の液体下では容易に生成するが、これらの化合物の分離・成長が著しく、マトリックスの強化にはほとんど効果が認められなかった。しかしながら、このようなAl-Ti系に、CH_4を添加したプラズマガスを高温(【similar or equal】1400℃)の融体下で作用させると、表面に特異な厚膜が生成した。この厚膜は、厚さが【similar or equal】mmに及び、その硬度はmHv【similar or equal】500に達することが測定され、XRD及びEPMAの分析によって、Al-Ti-Cの複合化合物の超微細粒子の分散による可能性の高いことが示唆された。 2.凝縮プラズマ生成非平衡物質の熱力学的安定性 この以上に硬度値の高い厚膜の安定性が、熱的及び腐食環境下で調べられた。その結果、耐食性に著しい向上が認められ、900〜1000℃の高温下でも安定であった。Al-C系では空気中の水分によっても容易に分解されるが、この厚膜は水中でも何ら腐食することなく安定であった。この原因は、Al-C系にTiをプラズマ反応によって非平衡的に含ませることによるものと解析された。 以上のような実験的進展と成果の蓄積に伴い、プラズマ材料創製から実用化に向けた今後の課題として以下の点が指摘された。 (1)Al-Ti-C系厚膜部の微細構造の透過形電子顕微鏡による解明 (2)Al-Ti-C系厚膜組成のマトリツクスアルミニウムへの分散法の確立 これらの2点の実験的解明と確立については、今後も引き続き行われる。, 日本学術振興会, 科学研究費助成事業, 2000 -2001, 基盤研究(B), 京都大学 - Intercalation compounds of fluoroacid as precursors for the syntheses of functional materials
HAGIWARA Rika; GOTO Takuya; NOHIRA Toshiyuki
A study was made on the thermal decomposition products of fluorine-graphite intercalation compounds with a 1st stage structure. Graphite fluoride prepared by the reaction of elemental fluorine and graphite in the presence of HF contains a small amount of HF which is eliminated by the reaction with liquid ammonia or heating at 〜250 ℃. This method is applicable to the preparation of homogeneous graphite compounds as electronic materials. The insertion of HF in the graphite fluoride gallery is reversible. The interaction of the HF molecule and graphite fluoride in the gallery is strong enough to decrease the conductivity of the compound by one order of magnitude. The first stage graphite fluoride possesses a semi ionic C-F bonding to show a thermal stability up to 350 ℃. A thermal decomposition without a stage transition proceeds above this temperature to give a residual carbon. The averaged F/C ratio of the fluorocarbon gases evolved by the decomposition is 1〜3. The residual carbon possesses a low crystallinity. The crystallite size along a and c axes are 50 and 5 nm, respectively. The layer separation is also increased by 〜14 pm., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 1999 -2001, Grant-in-Aid for Scientific Research (C), KYOTO UNIVERSITY - Establishment of anhydrous synthesis process using molten salts as reaction media
ITO Yasuhiko; NOHIRA Toshiyuki; GOTO Takuya; HAGIWARA Rika
The purpose of this project is to establish the anhydrous synthesis process that consists of purification of molten slats and separation/recovery of products. In year 1999, we succeeded in reducing the size of electrolysis cell to one half and the volume of molten salts to one tenth. In year 2000, we constructed a new electrolysis cell in an argon glove box having a gas purification equipment. By using this apparatus, it was found that water contamination level in LiCl-KCl melts could be reduced to one tenth compared to a conventional preparation method. In LiCl-KCl-DyCl_3 melts, a DyNi_2 film having 60 μm thickness was formed by potentiostatic cathodic electrolysis at a Ni electrode for 2 hours at 723 K. In LiCl-KCl-SmCl_3 melts, a SmNi_2 film having 20μm thickness was formed by galvanostatic cathodic electrolysis at a Ni electrode for 1hour at 723 K. In year 2001, we synthesized and/or searched for new room-and middle-temperature molten salts. At middle temperature range (200-300℃), it was found that the melting point of LiBr-KBr-CsBr was around 230℃, which was the lowest value among molten alkali halides. When LiH was added to this melt, it was found that hydride ion was formed. By using the electrode reaction of hydride ions, hydrogen absorption properties were evaluated for Ti electrode. At room temperature range, we succeeded in synthesizing a novel room temperature molten salt, EMIF-2.3HF, that has the highest conductivity among all room temperature molten salts at 25℃. It was found that EMIF-2.3HF had a electrochemical window of about 3.2 V. A high performance capacitor was constructed by using this melt., Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 1999 -2001, Grant-in-Aid for Scientific Research (B), KYOTO UNIVERSITY - 低温溶融塩を用いる新規な水素-リチウム熱再生型燃料電池
伊藤 靖彦; 野平 俊之; 後藤 琢也; 萩原 理加
本研究は、EMIC(エチルメチルイミダゾリウムクロリド)-AlCl_3系低温溶融塩を用いる新規な水素-リチウム熱再生型燃料電池の開発を目的としている。平成12年度は、水素源として水素化アルミニウムリチウム(LiAlH_4)を添加した、LiCl緩衝中性溶融塩系(AlCl_3:EMIC:LiCl=1.1:1:0.2)における水素電極反応を調べた。浴のラマン分光分析の結果から、水素を含むアニオン種(Al_2Cl_6H^-、Al_2Cl_5H_2^-等)の存在が示唆された。W電極を用いた電気化学測定の結果、-0.4V(vs.Al(III)/Al)よりも貴な電領域において、これらのアニオン種のアノード酸化による水素ガス発生が起こることが確認された。また、電極にPdおよびTiを用いた場合、電極中への電気化学的な水素吸蔵が起こることも分かった。さらに、一度水素を吸蔵させたPd電極を-0.7Vで保持することにより、電極中の水素が電気化学的に放出されることも分かった。しかし、この系におけるAlの析出反応が-0.8V付近に存在するため、水素-リチウム熱再生型燃料電池を構築した場合、起電力が大きくとれないことが予想される。この結果を踏まえ、新たな電解質として、水素化ホウ素リチウム(LiBH_4)を添加したEMIC-AlCl_3系低温溶融塩に関して検討を行った。ラマン分光分析の結果、塩基性溶融塩(AlCl_3:EMIC=44:56)にLiBH_4を添加した場合、BH_4^-およびB_2H_7^-が生成することが分かった。W電極を用いた電気化学測定により、-0.6V(vs.Al(III)/Al)よりも貴な電位領域でアノード反応により水素ガス発生が起こることが確認された。この浴の卑な側の電位窓限界は、約-1.8V(vs.Al(III)/Al)であるため、水素-リチウム熱再生型燃料電池を構築した場合に、起電力は1V以上得られる可能性が示された。, 日本学術振興会, 科学研究費助成事業, 1999 -2000, 萌芽的研究, 京都大学
