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Study of catalytic reaction at electrode-electrolyte interfaces by a CV-XAFS method

草野 翔吾*; 松村 大樹; 朝澤 浩一郎*; 岸 浩史*; 坂本 友和*; 山口 進*; 田中 裕久*; 水木 純一郎*

Journal of Electronic Materials, 46(6), p.3634 - 3638, 2017/06

 被引用回数:2 パーセンタイル:15.07(Engineering, Electrical & Electronic)

A method combining cyclic voltammetry (CV) with X-ray absorption fine structure (XAFS) spectroscopy, viz. CV-XAFS, has been developed to enable in situ real-time investigation of atomic and electronic structures related to electrochemical reactions. We use this method to study the reaction of a Pt/C cathode catalyst in the oxygen reduction reaction (ORR) in an alkaline electrolyte. It was found that the current induced by the ORR was first observed at approximately 0.08 V versus Hg/HgO, although the Pt valence remained almost unchanged. The electronic structure of the catalytic surface in the ORR was observed to be different in the negative and positive scan directions of CV measurements. Hydrogen adsorption is also discussed on the basis of the observation of this spectral change. We have demonstrated that CV-XAFS provides dynamical structural and electronic information related to electrochemical reactions and can be used for in situ real-time measurements of a catalyst.


Negative correlation between electrical response and domain size in a Ti-composition-gradient Pb[(Mg$$_{1/3}$$Nb$$_{2/3}$$)$$_{1-x}$$Ti$$_{x}$$]O$$_{3}$$ crystal near the morphotropic phase boundary

清水 大輔*; 塚田 慎也*; 松浦 直人*; 坂本 潤哉*; 小島 誠治*; 並河 一道*; 水木 純一郎; 大和田 謙二

Physical Review B, 92(17), p.174121_1 - 174121_5, 2015/11

 被引用回数:11 パーセンタイル:47.08(Materials Science, Multidisciplinary)



Progress of divertor simulation research toward the realization of detached plasma using a large tandem mirror device

中嶋 洋輔*; 武田 寿人*; 市村 和也*; 細井 克洋*; 大木 健輔*; 坂本 瑞樹*; 平田 真史*; 市村 真*; 池添 竜也*; 今井 剛*; et al.

Journal of Nuclear Materials, 463, p.537 - 540, 2015/08

 被引用回数:18 パーセンタイル:84.74(Materials Science, Multidisciplinary)

A divertor simulation experimental module (D-module) with a V-shaped divertor target is installed in the west end-sell in GAMMA 10 large tandem mirror device, and a hydrogen plasma irradiation experiment to the target have been started to investigate radiation cooling mechanism on the target. A gas injection system is installed in the D-module and Langmuir probe and calorie meter array are mounted on the target plate. During the plasma irradiation, the highest electron density of 2.4 $$times$$ 10$$^{18}$$ m$$^{-3}$$ and a significant reduction of the electron temperature from a few tens of eV to 2 eV are achieved on the target plate by hydrogen and noble gas injection into the D-module.


Development of divertor simulation research in the GAMMA 10/PDX tandem mirror

中嶋 洋輔*; 坂本 瑞樹*; 吉川 正志*; 大木 健輔*; 武田 寿人*; 市村 和也*; 細井 克洋*; 平田 真史*; 市村 真*; 池添 竜也*; et al.

Proceedings of 25th IAEA Fusion Energy Conference (FEC 2014) (CD-ROM), 8 Pages, 2014/10

In the large tandem mirror device GAMMA 10/PDX, a divertor simulation experimental module (D-module) with a V-shaped divertor target have been installed in the end-mirror. A massive gas injection of hydrogen and noble gases (argon and xenon) into the D-module during hydrogen plasma irradiation onto the target was performed, and plasma detachment from the target was investigated. Electron temperature measured by Langmuir probe array on the target was significantly reduced from a few tens of eV to $$<$$ 3 eV, and particle flux was also reduced. A bright H$$alpha$$ emission in the upstream region of the D-module and strong reduction near the target were observed by a two-dimensional image of H$$alpha$$ emission in the target observed with a high-speed camera. Molecular activated recombination (MAR) process is expected to contribute to the reduction of the electron temperature and the particle flux.



坂本 瑞樹*; 大野 哲靖*; 朝倉 伸幸; 星野 一生

プラズマ・核融合学会誌, 90(8), p.473 - 479, 2014/08

国際熱核融合実験炉ITERの建設が進む中、近年、原型炉(DEMO)に関する課題が活発に議論され、国内では文部科学省の原子力科学技術委員会核融合研究作業部会の下に「核融合原型炉開発のための技術基盤構築の中核的役割を担うチーム(合同コアチーム)」が作られ、IAEAではDEMO Programme Workshopが開催されている。このような背景の中で、直線型プラズマ生成装置の果たす役割とDEMOにおけるダイバータ設計の課題を議論する。直線型プラズマ生成装置の研究状況についての説明、トカマクDEMOでのダイバータの役割と熱粒子制御における課題の説明、現状のDEMO概念とダイバータ検討の概要、DEMO設計で重要な役割を果たすダイバータシミュレーションとモデリングの開発課題について解説する。


ダイバータ, スクレイプオフ層およびプラズマ壁相互作用

仲野 友英; 坂本 瑞樹*

プラズマ・核融合学会誌, 88(11), p.672 - 674, 2012/11



Eddy current-adjusted plasma shape reconstruction by Cauchy condition surface method on QUEST

中村 一男*; Jiang, Y.*; Liu, X.*; 御手洗 修*; 栗原 研一; 川俣 陽一; 末岡 通治; 長谷川 真*; 徳永 和俊*; 図子 秀樹*; et al.

Fusion Engineering and Design, 86(6-8), p.1080 - 1084, 2011/10

 被引用回数:4 パーセンタイル:33.79(Nuclear Science & Technology)

CCS (Cauchy Condition Surface) method is a numerical approach to reproduce plasma shape, which has good precision in conventional tokamak. In order to apply it in plasma shape reproduction of ST (Spherical Tokamak), the calculation precision of the CCS method in CPD ($$B$$$$_{rm t}$$ = 0.25 T, $$R$$ = 0.3 m, $$a$$ = 0.2 m) has been analyzed. The precision was confirmed also in ST and decided to be applied to QUEST ($$B$$$$_{rm t}$$ = 0.25 T, $$R$$ = 0.68 m, $$a$$ = 0.40 m). In present stage from the magnetic measurement, it is known that the eddy current effect is large in QUEST experiment, and there are no special magnetic measurements for eddy current now, so some proper model should be selected to evaluate the eddy current effect. The eddy current density by not only CS (Center Solenoid) coil but also plasma current is calculated using EDDYCAL (JAEA), the eddy currents are taken as unknown variables and solved together with plasma shape reconstruction. The result shows that the CCS method with eddy current adjustment achieves stable, accurate reconstruction of plasma shape in application to QUEST.


Structural changes in surface and bulk LiNi$$_{0.5}$$Mn$$_{0.5}$$O$$_{2}$$ during electrochemical reaction on epitaxial thin-film electrodes characterized by ${it in situ}$ X-ray scattering

坂本 和幸*; 平山 雅章*; 小西 宏明*; 園山 範之*; Dupr$'e$, N.*; Guyomard, D.*; 田村 和久; 水木 純一郎; 菅野 了次*

Physical Chemistry Chemical Physics, 12(15), p.3815 - 3823, 2010/04

 被引用回数:32 パーセンタイル:74.64(Chemistry, Physical)



Surface structure of LiNi$$_{0.8}$$Co$$_{0.2}$$O$$_{2}$$; A New experimental technique using in situ X-ray diffraction and two-dimensional epitaxial film electrodes

坂本 和幸*; 平山 雅章*; 園山 範之*; 森 大輔*; 山田 淳夫*; 田村 和久; 水木 純一郎; 菅野 了次*

Chemistry of Materials, 21(13), p.2632 - 2640, 2009/05

 被引用回数:36 パーセンタイル:71.58(Chemistry, Physical)




栗原 研一; 川俣 陽一; 末岡 通治; Wang, F.*; 中村 一男*; 御手洗 修*; 佐藤 浩之助*; 図子 秀樹*; 花田 和明*; 坂本 瑞樹*; et al.

九州大学応用力学研究所RIAMフォーラム2008講演要旨, p.66 - 69, 2008/06

JT-60で開発したプラズマ最外殻磁気面の同定法であるコーシー条件面(CCS)法は、穴の開いた特異性のある真空場の厳密解を基本とし、電磁気センサー信号を用いて精度よくプラズマの断面形状を同定できる。このCCS法を九州大学で平成20年度より稼動計画のプラズマ境界力学実験装置QUEST(Q-shu University Experiment with Steady State Spherical Tokamak)のプラズマ平衡実時間制御へ適用し、高精度にプラズマ断面形状を再構築することを確認した。本発表は、QUESTに対して、JT-60での経験に基づいた実時間制御システム構成や実時間プラズマ形状再構築手法の提案における一連の検討結果報告である。


Characterization of electrode/electrolyte interface using ${it in situ}$ X-ray reflectometry and LiNi$$_{0.8}$$Co$$_{0.2}$$O$$_{2}$$ epitaxial film electrode synthesized by pulsed laser deposition method

平山 雅章*; 坂本 和幸*; 平出 哲也*; 森 大輔*; 山田 淳夫*; 菅野 了次*; 園山 範之*; 田村 和久; 水木 純一郎

Electrochimica Acta, 53(2), p.871 - 881, 2007/12

 被引用回数:41 パーセンタイル:65.57(Electrochemistry)



Mechanistic study on lithium intercalation using a restricted reaction field in LiNi$$_{0.5}$$Mn$$_{0.5}$$O$$_{2}$$

坂本 和幸*; 小西 宏明*; 園山 範之*; 山田 淳夫*; 田村 和久; 水木 純一郎; 菅野 了次*

Journal of Power Sources, 174(2), p.678 - 682, 2007/12

 被引用回数:24 パーセンタイル:60.33(Chemistry, Physical)



Physics issues and simulation of the JT-60 SA divertor for large heat and particle handling

朝倉 伸幸; 川島 寿人; 清水 勝宏; 櫻井 真治; 藤田 隆明; 竹永 秀信; 仲野 友英; 久保 博孝; 東島 智; 林 孝夫; et al.

Europhysics Conference Abstracts (CD-ROM), 31F, 4 Pages, 2007/00



Overview of national centralized tokamak program; Mission, design and strategy to contribute ITER and DEMO

二宮 博正; 秋場 真人; 藤井 常幸; 藤田 隆明; 藤原 正巳*; 濱松 清隆; 林 伸彦; 細金 延幸; 池田 佳隆; 井上 信幸; et al.

Journal of the Korean Physical Society, 49, p.S428 - S432, 2006/12



Magnetic sensor dependence of CCS method to reproduce ST plasma shape

Wang, F.*; 中村 一男*; 御手洗 修*; 栗原 研一; 川俣 陽一; 末岡 通治; 佐藤 浩之助*; 図子 秀樹*; 花田 和明*; 坂本 瑞樹*; et al.

九州大学応用力学研究所RIAMフォーラム2006講演要旨, p.138 - 141, 2006/06



Overview of the national centralized tokamak programme

菊池 満; 玉井 広史; 松川 誠; 藤田 隆明; 高瀬 雄一*; 櫻井 真治; 木津 要; 土屋 勝彦; 栗田 源一; 森岡 篤彦; et al.

Nuclear Fusion, 46(3), p.S29 - S38, 2006/03

 被引用回数:13 パーセンタイル:42.6(Physics, Fluids & Plasmas)



Engineering design and control scenario for steady-state high-beta operation in national centralized tokamak

土屋 勝彦; 秋場 真人; 疇地 宏*; 藤井 常幸; 藤田 隆明; 藤原 正巳*; 濱松 清隆; 橋爪 秀利*; 林 伸彦; 堀池 寛*; et al.

Fusion Engineering and Design, 81(8-14), p.1599 - 1605, 2006/02

 被引用回数:1 パーセンタイル:10.2(Nuclear Science & Technology)



Design study of national centralized tokamak facility for the demonstration of steady state high-$$beta$$ plasma operation

玉井 広史; 秋場 真人; 疇地 宏*; 藤田 隆明; 濱松 清隆; 橋爪 秀利*; 林 伸彦; 堀池 寛*; 細金 延幸; 市村 真*; et al.

Nuclear Fusion, 45(12), p.1676 - 1683, 2005/12

 被引用回数:15 パーセンタイル:46.57(Physics, Fluids & Plasmas)



Progress in physics and technology developments for the modification of JT-60

玉井 広史; 松川 誠; 栗田 源一; 林 伸彦; 浦田 一宏*; 三浦 友史; 木津 要; 土屋 勝彦; 森岡 篤彦; 工藤 祐介; et al.

Plasma Science and Technology, 6(1), p.2141 - 2150, 2004/02

 被引用回数:2 パーセンタイル:6.59(Physics, Fluids & Plasmas)



Objectives and design of the JT-60 superconducting tokamak

石田 真一; 阿部 勝憲*; 安藤 晃*; Chujo, T.*; 藤井 常幸; 藤田 隆明; 後藤 誠一*; 花田 和明*; 畑山 明聖*; 日野 友明*; et al.

Nuclear Fusion, 43(7), p.606 - 613, 2003/07


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