九州大学 研究者情報
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基本情報 研究活動 教育活動 社会活動
渡邉 賢(わたなべ けん) データ更新日:2020.07.16



主な研究テーマ
全固体Liイオン二次電池に関する研究
キーワード:全固体
2013.07.
自己拡散を用いた酸化物中の欠陥評価
キーワード:自己拡散
2009.06.
半導体ガスセンサに関する研究
キーワード:ガスセンサ
2009.04.
混合導電性ぺロブスカイト型酸化物を用いた酸素分離
キーワード:混合導電体、ぺロブスカイト型酸化物
2003.04.
従事しているプロジェクト研究
戦略的創造研究推進事業、先端的低炭素化技術開発
2016.04~2022.03, 代表者:渡邉 賢, 国立大学法人 九州大学, 国立研究開発法人科学技術振興機構.
研究業績
主要原著論文
1. Ken Watanabe, Isao Sakaguchi, Minako Hashiguchi, Noriko Saito, Emily M. Ross, Hajime Haneda, Takeo Ohsawa, Naoki Ohashi, Isotope tracer investigation and ab-initio simulation of anisotropic hydrogen transport and possible multi-hydrogen centers in tin dioxide, Journal of Applied Physics, 10.1063/1.4953387, 119, 22, 2016.06, [URL], Hydrogen as an impurity in single crystals of tin dioxide was investigated through diffusivity and vibrational-mode analyses performed using isotope tracers and density functional theory calculations. It was found that hydrogen diffusion along the 001 axis is very fast, even at relatively low temperatures (400 �C), but is considerably slower within the (001) plane. Using transitional state calculations, this diffusion behavior was determined to be the result of anisotropy in the migration barrier for interstitial hydrogen (Hi). In addition, the two distinct vibrational modes observed in the optical spectrum were identified as the O-H stretching modes of Hi and the substitutional hydrogen at the tin sites..
2. Ken Watanabe, Takeo Ohsawa, Isao Sakaguchi, Oliver Bierwagen, Mark E. White, Min Ying Tsai, Ryosuke Takahashi, Emily M. Ross, Yutaka Adachi, James S. Speck, Hajime Haneda, Naoki Ohashi, Investigation of charge compensation in indium-doped tin dioxide by hydrogen insertion via annealing under humid conditions, Applied Physics Letters, 10.1063/1.4870425, 104, 13, 2014.03, [URL], The behavior of hydrogen (H) as an impurity in indium (In)-doped tin dioxide (SnO2) was investigated by mass spectrometry analyses, with the aim of understanding the charge compensation mechanism in SnO2. The H-concentration of the In-doped SnO2 films increased to (1-2)×1019cm-3 by annealing in a humid atmosphere (WET annealing). The electron concentration in the films also increased after WET annealing but was two orders of magnitude less than their H-concentrations. A self-compensation mechanism, based on the assumption that H sits at substitutional sites, is proposed to explain the mismatch between the electron- and H-concentrations..
3. Ken Watanabe, Isao Sakaguchi, Shunichi Hishita, Naoki Ohashi, Hajime Haneda, Visualization of grain boundary as blocking layer for oxygen tracer diffusion and a proposed defect model in non doped BaTiO3 ceramics, Applied Physics Express, 10.1143/APEX.4.055801, 4, 5, 2011.05, [URL], We performed visualization of the oxygen diffusion path in oxidized and reduced BaTiO3 ceramics by utilizing an ion-imaging technique. The oxygen tracer diffused quickly from the surface up to the grain boundary, and then behaved as discontinuous steps at the grain boundary. The grain boundary acted as a blocking layer against oxygen diffusion. The reduction process enhanced the blocking effect. The blocking of oxygen diffusion at the grain boundary originated in the formation and distribution of complex defects between the charged oxygen vacancy and the reduced Ti near the grain boundary..
4. Watenabe, Ken; Yuasa, Masayoshi; Kida, Tetsuya; Teraoka, Yasutake; Yamazoe, Noboru; Shimanoe, Kengo, High-Performance Oxygen-Permeable Membranes with an Asymmetric Structure Using Ba0.95La0.05FeO3-delta Perovskite-Type Oxide, ADVANCED MATERIALS, 10.1002/adma.200903953, 22, 21, 2367-2370, 2010.06.
5. Ken Watanabe, Masayoshi Yuasa, Tetsuya Kida, Kengo Shimanoe, Yasutake Teraoka, Noboru Yamazoe, Dense/porous asymmetric-structured oxygen permeable Membranes based on la0.6Ca0.4CoO3 perovskite-type oxide, Chemistry of Materials, 10.1021/cm8013144, 20, 22, 6965-6973, 2008.11, [URL], To achieve high-efficiency oxygen permeation using mixed (ionic and electronic) conducting perovskite-type oxides, we examined asymmetric-structured membranes of La0.6Ca0.4CoO3 in which a thin dense membrane was deposited on a porous support. The La0.6Ca 0.4CoO3 porous support was fabricated using irregular-shaped precursor particles prepared through an oxalate method. The fabricated support had good gas permeability and thermal stability, showing sufficient properties as a support for dense thin membranes. A dense membrane of 10 μm thickness was successfully formed on the porous support by coating a La0.6Ca0.4CoO3 slurry and subsequent densification by sintering. The deposited thin membrane was gastight and free from clacks, as revealed by gas permeation tests and SEM observations. The asymmetric membrane exhibited a high oxygen permeability of 1.66 cm3 (STP, standard temperature and pressure) min-1 cm-2 at 930 °C, which was four times higher than that of a typical sintered-disk type membrane with 1200 μm thickness, demonstrating its feasibility as a high-performance oxygen separation membrane..
主要総説, 論評, 解説, 書評, 報告書等
主要学会発表等
1. Ken Watanabe, Koichi Suematsu, Kengo Shimanoe , Low temperature sintering of garnet-type Li7La3Zr2O12 for all solid state Li-ion battery
, OptoX-NANO 2019, 2019.12.
2. Ken Watanabe, Challenge toward co-sintering of all solid-state Li ion battery based on oxides, The 11th International Conference on the Science and Technology for Advanced Ceramics, 2019.07.
3. Ken Watanabe, Shingo Ide, Koichi Suematsu, Kengo Shimanoe, New concept of solid electrolyte gas sensor based on oxide-ionic conductor, 22th international Conference on Solid State Ionics, 2019.06.
4. @K. Watanabe, Material design for an electrode of oxygen pumps based on oxide-ion conductors, CIMTEC2018 (14th International Ceramics Congress), 2018.06.
5. #吉野嵩啓,渡邉賢,末松昂一,西堀麻衣子,島ノ江憲剛, Li-B系酸化物を用いたLi7 La3 Zr2O12 の低温焼結, 第 56 回セラミックス基礎科学討論会プログラム, 2018.01.
6. @K. Watanabe, Material design for gas sensor based on defect in metal oxide semiconductor, the 7th edition of the Gospel Workshop, 2017.11.
7. @K. Watanabe, Hydrogen in Metal oxides semiconductor, TVS-2017, 2017.10.
学会活動
所属学会名
電気化学会
日本セラミックス協会
化学センサ研究会
学術論文等の審査
年度 外国語雑誌査読論文数 日本語雑誌査読論文数 国際会議録査読論文数 国内会議録査読論文数 合計
2018年度      
2017年度      
2016年度      
受賞
2019年JCS-JAPAN優秀論文賞, 日本セラミックス協会, 2020.05.
平成31年度科学技術分野の文部科学大臣表彰 若手科学者賞, 文部科学省, 2019.04.

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