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Affiliation |
Engineering educational research section Research & Development Center for Sustanable Energy and Environmental Engineering |
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Professor |
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External Link |
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NISHIOKA Kensuke
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Degree 【 display / non-display 】
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Doctor (Engineering) ( 2004.3 Nara Institute of Science and Technology )
Research Areas 【 display / non-display 】
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials
Papers 【 display / non-display 】
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Chimney-ladder sulfide Sr9Ti8S24 as a thermoelectric material with low thermal conductivity Reviewed
Kamimizutaru K., Nagaoka A., Shigeeda Y., Nishioka K., Higashi T., Yasui S., Yoshino K.
Journal of Physics and Chemistry of Solids 163 2022.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics and Chemistry of Solids
Chimney-ladder sulfide Sr9Ti8S24 (STS) has potential as a thermoelectric (TE) material because of its intrinsic low thermal conductivity. We studied the growth of a polycrystalline STS sample and its fundamental TE properties. The resistivity of n-type polycrystalline STS can be described as thermal activation and the potential barrier at grain boundary. Regarding the TE properties, n-type STS polycrystalline samples exhibit a low thermal conductivity <1 W/mK between 323 and 673 K caused by a large unit cell with an axis = 12.15 Å, c axis = 42.32 Å, and Umklapp scattering. Consequently, the figure of merit for the STS sample reaches 3.0 × 10−4 at 673 K.
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Impact of climatic conditions on prospects for integrated photovoltaics in electric vehicles Reviewed International coauthorship
Thiel C., Gracia Amillo A., Tansini A., Tsakalidis A., Fontaras G., Dunlop E., Taylor N., Jäger-Waldau A., Araki K., Nishioka K., Ota Y., Yamaguchi M.
Renewable and Sustainable Energy Reviews 158 2022.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Renewable and Sustainable Energy Reviews
Integrated photovoltaics are an emerging technology which can extend the range of electric vehicles. However, up to now there is a lack of a consensus method that would provide consumers with an estimate of the fraction of annual driving which could be covered by solar power generated onboard in different usage scenarios and locations. To address this, we assess the energy implications of vehicle integrated photovoltaics for a commuter car and light delivery van for six climatic regions and for typical daily usage profiles over a ten-year period. The analysis captures the energy needs for driving and cabin temperature control to an unprecedented level of detail. Our results reveal that the grid power needed to drive such vehicles on identical routes can vary by more than 44% between climate regions. In the best case the solar power generated can cover up to 35% of the driving range per year. This contribution can vary by a factor of 2.5 between different climates, from 1800 to 5100 km annually, considerably mitigating the effect of ambient conditions on electric range. We propose developing consumer labels for solar electric vehicles that would consider this variation according to climatic conditions. The method described in this paper could help to frame initial discussions for such labels. We identify further requirements for research and development, standardisation, and policy needs.
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Ota Y., Araki K., Nagaoka A., Nishioka K.
Cleaner Engineering and Technology 7 2022.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Cleaner Engineering and Technology
By mounting photovoltaics (PV) on the roof of an electric vehicle (EV), solar energy can be used to supply a considerable portion of the energy demand of the EV. The roof is the best place for PV installation on the vehicle body because doors and engine hood have less yearly-average sunlight available and more stringent mechanical requirements. The roof of a modern passenger vehicle such as a sedan is not flat, and parts with high curvature or a significant slope do not need to be covered. However, there are no design rules available for mounting PV on a vehicle roof, such as determining the coverage ratio. In this study, the distributions of roof shapes and sizes were obtained from trace drawings of various commercially available passenger vehicles. This was then used to calculate the distributions of the mechanical (i.e., local curvature) and optical (i.e., local solar utilization rate) properties. Based on the results, general guidelines were developed, including a potential coverage ratio of 96% for a hemispherical roof with a radius of curvature of 1 m. These guidelines have already been successfully demonstrated and prototyped with a small module.
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Impact and recent approaches of high-efficiency solar cell modules for PV-powered vehicles Reviewed
Masafumi Yamaguchi, Taizo Masuda, Kenji Araki, Yasuyuki Ota, and Kensuke Nishioka
Japanese Journal of Applied Physics 61 SC0802 2022.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics and Chemistry of Solids
Chimney-ladder sulfide Sr9Ti8S24 (STS) has potential as a thermoelectric (TE) material because of its intrinsic low thermal conductivity. We studied the growth of a polycrystalline STS sample and its fundamental TE properties. The resistivity of n-type polycrystalline STS can be described as thermal activation and the potential barrier at grain boundary. Regarding the TE properties, n-type STS polycrystalline samples exhibit a low thermal conductivity <1 W/mK between 323 and 673 K caused by a large unit cell with an axis = 12.15 Å, c axis = 42.32 Å, and Umklapp scattering. Consequently, the figure of merit for the STS sample reaches 3.0 × 10−4 at 673 K.
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Shigeeda Y., Nagaoka A., Yoshino K., Nishioka K.
Journal of Physics and Chemistry of Solids 161 2022.2
Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics and Chemistry of Solids
We investigated the growth mechanism and the thermoelectric (TE) properties of the II-IV-V2 group chalcopyrite ZnSnSb2 with a pseudocubic structure, which is a key strategy for improving the TE performance by increasing the degeneracy at the valence band edge. The growth mechanism of ZnSnSb2 shows the peritectic reaction as: ZnSb + SnSb + liquid phase ↔ ZnSnSb2 for 320–360 °C. The ZnSnSb2 single phase was obtained from the starting composition of Zn:Sn:Sb = 1:5:2. The high-temperature TE properties were measured up to 573 K, and the thermal conductivity values were 1.5 times lower than the reported value, which was caused by enhanced phonon scattering by the off-stoichiometric composition. Consequently, the TE figure of merit for off-stoichiometric ZnSnSb2 reached 0.12 at 573 K, which is 1.4 times higher than that of the reported stoichiometric sample.
Books 【 display / non-display 】
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水素の製造、輸送・貯蔵技術と材料開発 事例集
西岡賢祐（ Role： Contributor）
㈱技術情報協会 2019.4
Language：Japanese Book type：Scholarly book
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Concentrator Photovoltaic Systems: Introduction, Wiley Encyclopedia of Electrical and Electronics Engineering
Kensuke Nishioka, Yasuyuki Ota（ Role： Joint author）
John Wiley & Sons, Inc. 2017.11
Total pages：12 Responsible for pages：12 Language：English Book type：Dictionary, encyclopedia
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太陽熱発電の最新動向
西岡賢祐 (玉浦裕 監修)（ Role： Joint author）
シーエムシー出版 2014.11
Language：Japanese Book type：Scholarly book
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新太陽エネルギー利用ハンドブック 第Ⅴ編 太陽光発電技術
西岡賢祐（ Role： Joint author）
一般社団法人日本太陽エネルギー学会 2013.12
Language：Japanese Book type：Scholarly book
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高効率太陽電池
山口真史 監修（ Role： Joint author）
NTS出版 2012.5
Language：Japanese Book type：Scholarly book
MISC 【 display / non-display 】
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太陽光由来の貯蔵可能燃料 Invited
西岡賢祐
カーボン・エネルギーコントロール社会協議会 (CanApple): CanAppleニュース ( 230 ) 2022.4
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media) Publisher：一般財団法人光産業技術振興協会
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MBD活用デジタル制御の太陽光発電・水素製造システム Invited
中島 善康、米澤 遊、太田 靖之、西岡 賢祐
エネルギー・資源 43 ( 251 ) 44 - 49 2022.1
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media) Publisher：一般財団法人光産業技術振興協会
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最新の太陽光発電応用技術 Invited Reviewed
西岡賢祐
オプトニューズ テクノロジートレンド 15 ( 3 ) 16 - 20 2020.9
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media) Publisher：一般財団法人光産業技術振興協会
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Multivariate Analysis Using R for Various Climatic Effects on the Output Performances of CIGS and Multi-Crystalline Si Photovoltaic Systems Installed in Miyazaki, Japan
Kyaw Myo WIN, Yasuyuki OTA, Kensuke NISHIOKA, Tatsuya SAKODA, Noriyuki HAYASHI
宮崎大学工学部紀要 49 119 - 127 2020.9
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution) Publisher：国立大学法人宮崎大学
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論説「太陽エネルギーや焼酎バイオマスからのエネルギー・資源回収について」 Invited Reviewed
西岡賢祐
都市清掃 72 ( 349 ) 268 - 279 2019.5
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media) Publisher：社団法人全国都市清掃会議
Presentations 【 display / non-display 】
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レーザ受光用InGaAsP光電変換素子における窓層の効果の評価 Invited
本村優芽, 櫛山爽, 西岡賢祐, 荒木昌和
2022年 第69回応用物理学会春季学術講演会 (青山学院 相模原キャンパス ＋ オンライン) 2022年 第69回応用物理学会春季学術講演会
Event date： 2022.3.22 - 2022.3.26
Language：Japanese Presentation type：Oral presentation (general)
Venue：青山学院 相模原キャンパス ＋ オンライン
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SnSバルク結晶へのSbドーピング Invited
大澤育巳, 石谷康平, 野瀬嘉太郎, 永岡章, 西岡賢祐
2022年 第69回応用物理学会春季学術講演会 (青山学院 相模原キャンパス ＋ オンライン) 2022年 第69回応用物理学会春季学術講演会
Event date： 2022.3.22 - 2022.3.26
Language：Japanese Presentation type：Poster presentation
Venue：青山学院 相模原キャンパス ＋ オンライン
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シリコン太陽電池の魅力的なアプリケーション Invited
西岡賢祐
2022年 第69回応用物理学会春季学術講演会 (青山学院 相模原キャンパス ＋ オンライン) 2022年 第69回応用物理学会春季学術講演会
Event date： 2022.3.22 - 2022.3.26
Language：Japanese Presentation type：Oral presentation (invited, special)
Venue：青山学院 相模原キャンパス ＋ オンライン
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The resilience of PV-powered Vehicles (VIPV) International conference
Kenji Araki, Yasuyuki Ota, Kensuke Nishioka
The 31st International Photovoltaic Science and Engineering Conference (PVSEC-31) (Online) The 31st International Photovoltaic Science and Engineering Conference (PVSEC-31)
Event date： 2021.12.13 - 2021.12.15
Language：English Presentation type：Oral presentation (general)
Venue：Online
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Outdoor evaluation of plastic-integrated concentrating photovoltaic module with 1-eV-bottom subcell triple-junction solar cell International conference
Taichi Uno, Yasuyuki Ota, Shutetsu Kanayama, Kenji Araki, Kensuke Nishioka
The 31st International Photovoltaic Science and Engineering Conference (PVSEC-31) (Online) The 31st International Photovoltaic Science and Engineering Conference (PVSEC-31)
Event date： 2021.12.13 - 2021.12.15
Language：English Presentation type：Oral presentation (general)
Venue：Online
Awards 【 display / non-display 】
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第4回フロンティア太陽電池セミナー 優秀賞
2019.11 フロンティア太陽電池セミナー実行委員会 多接合太陽電池の出力解析モデルの確立および精度検証
才木 大夢, 西岡 賢祐
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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2019年度第16回日本熱電学会学術講演会 優秀講演賞
2019.9 一般社団法人日本熱電学会 Se混晶によるCu2ZnSn(SXSe1-X)4単結晶のZT向上
永岡 章, 吉野 賢二, 増田 泰造, Michael Scarpulla, 西岡 賢祐
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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応用物理学会春季学術講演会 講演奨励賞
2019.9 公益社団法人応用物理学会 ZT＞1を示す環境調和型熱電変換材料Cu2ZnSnS4バルク単結晶の開発
永岡 章, 吉野 賢二, 増田 泰造, Michael Scarpulla, 西岡 賢祐
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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第16回「次世代の太陽光発電システム」シンポジウム Innovative PV賞
2019.7 日本学術振興会産学協力研究委員会 第175委員会 宮崎の特長を活かした太陽光発電応用研究開発
西岡 賢祐, 霧村 雅昭, 永岡 章, 太田 靖之
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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2019 5th International Conference on Environment and Renewable Energy (ICERE 2019) Best Presentation Award
2019.2 ICERE 2019 Organizing Committee Accurate voltage measurement of a photovoltaic module by a non-contact electrostatic voltmeter
Sakutaro Miyajima, Akira Nagaoka, and Kensuke Nishioka
Award type：Award from international society, conference, symposium, etc. Country：Viet Nam
Grant-in-Aid for Scientific Research 【 display / non-display 】
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固体高分子水電解における不純物起因劣化メカニズムの解明および特性回復手法の確立
Grant number：19K12401 2019 - 2022.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
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高効率太陽電池材料の高倍率集光時におけるキャリアの動的ふるまいの解明
2013.04 - 2018.03
科学研究費補助金 基盤研究(B)
Authorship：Principal investigator
高効率太陽電池材料の高倍率集光時におけるキャリアの動的ふるまいの解明
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直線偏光Nd:YAGレーザーによる微細金属ドットの2次元規則配列加工に関する研究
2006.04 - 2008.03
科学研究費補助金 若手研究(B)
コヒーレントな直線偏光Nd:YAGパルスレーザーを試料に照射することにより溶融金属内に自発的に発生するレーザー誘導周期的エネルギー密度分布を利用し、位置と大きさを制御した規則性配列微細金属ドットの形成に取り組んだ。直線偏光Nd:YAGパルスレーザーをSi酸化膜上に堆積したニッケル薄膜に照射するだけで、位置と大きさを制御した規則性配列微細ニッケルドットを形成することに成功した。