ARAKI Takuto

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Professor

Date of Birth

1975


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Education 【 display / non-display 】

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    2003

    Kyoto University   Department of Mechanical Engineering   Doctor Course   Completed

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    2000

    Kyoto University   Department of Mechanical Engineering   Master Course   Completed

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    1998

    Kyoto University   Department of Engineering Science

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Degree 【 display / non-display 】

  • Doctor of Engineering - Kyoto University

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Campus Career 【 display / non-display 】

  • 2020.4
    　
    　

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Professor  

  • 2007.4
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    2020.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2021.4
    　
    　

    Concurrently   Yokohama National UniversityInterfaculty Graduate School of Innovative and Practical Studies   Professor  

  • 2020.10
    　
    　

    Concurrently   Yokohama National UniversityInstitute of Advanced Sciences   Professor  

  • 2020.4
    　
    　

    Concurrently   Yokohama National UniversityGraduate School of Engineering   Department of Systems Integration   Professor  

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External Career 【 display / non-display 】

  • 2004.1
    -
    2007.3

    Toyohashi University of Technology   Department of Electrical and Electronic Engineering   Research Assistant  

  • 2003.7
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    2003.12

    JSPS Postdoc, University of California Los Angels   Special researcher of the Japan Society for the Promotion of Science  

  • 2002.4
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    2003.6

    JSPS Postdoc, Kyoto University, Fuclty of Engineering, Department of Mechanical Engineering  

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Academic Society Affiliations 【 display / non-display 】

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    The Heat Transfer Society of Japan

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    The Japan Society of Mechanical Engineers

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    The Electrochemical Society of Japan

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    The Institute of Electrical Engineers of Japan

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Research Areas 【 display / non-display 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

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Books 【 display / non-display 】

  • マイクロ・ナノ熱工学の進展

    荒木拓人 他（ Role： Joint author）

    エヌ・ティー・エス  （ ISBN:978-4-86043-722-0 ）

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    Language：Japanese Book type：Scholarly book

  • Fuel Cells and Hydrogen: From Fundamentals to Applied Research

    Viktor Hacker, Shigenori Mitsushima et al.（ Role： Sole author）

    Elsevier  （ ISBN:0128114592 ）

    Amazon

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    Language：English Book type：General book, introductory book for general audience

  • Advanved Studies of Polymer Electrolyte Fuel Cells

    Shigenori Mitsushima, Takuto Araki, Ken-ichiro Ota, Viktor Hacker, Matthuasus Siebenhofer（ Role： Joint author）

    TU Graz 

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    Total pages：122   Language：English Book type：Scholarly book

  • LiBの高容量・高耐久化のための電極-電解液(質)の界面制御技術と解析・評価法

    荒木拓人　他104名（ Role： Joint author ,  第3章2節を担当．）

    技術情報協会 

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    Language：Japanese Book type：Scholarly book

    リチウムイオンバッテリーの発熱特性の評価要因としてのインピーダンス測定法について具体例を用いながら解説した．

  • 電気化学/インピーダンス測定のノウハウと正しいデータ解釈

    荒木拓人　他　97名（ Role： Joint author ,  第2章第2節第23項を担当）

    技術情報協会 

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    Language：Japanese Book type：Scholarly book

    リチウムイオン二次電池のインピーダンス測定の実際について，実例を交えながら解説した．特に二次電池は測定中に内部状態(SOC)が変化するため，定電流測定の結果をSOCごとに整理することで簡便に正確なインピーダンスを測定できることを示した．

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Thesis for a degree 【 display / non-display 】

  • マイクロスケール流路内の気体の熱流動特性

    荒木　拓人

    2003.3

    Doctoral Thesis   Single Work  

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    京都大学　工学研究科
    マイクロスケール流れにおける熱流動特性を実験と解析両面から包括的に明らかにした。

  • マイクロチャネル内気体流れの圧力損失特性に関する実験的研究

    荒木　拓人

    2000.3

    Master Thesis   Single Work  

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    京都大学　工学研究科
    マイクロチャネル内流れの摩擦特性について実験的に明らかにした。

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Papers 【 display / non-display 】

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Review Papers 【 display / non-display 】

  • Operando observation of bubble formation and mass transfer overpotential in alkaline water electrolysis

    MISUMI Ryuta, KURODA Yoshiyuki, ARAKI Takuto, MITSUSHIMA

    JAPANESE JOURNAL OF MULTIPHASE FLOW   39 ( 1 )   18 - 25   2025.3

    DOI

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Joint Work  

    <p>Alkaline water electrolysis (AWE) has attracted significant attention for producing hydrogen. One of the problems with AWE is the increase in overpotential, which is attributed to bubbles covering the electrode surface at high current densities. Therefore, understanding the relationship between the bubble formation behavior and reactant transfer mechanism is important for reducing the overpotential. In this study, an <i>operando</i> observation system for the oxygen and hydrogen bubble formation behavior on nickel wire electrodes was developed using a microscope-type high-speed video camera. The relationship between the current density-electrode potential curve and bubble generation behavior was then investigated. The results showed that the generation of oxygen/hydrogen bubbles was activated as current density increased. At a high current density, bubbles covered the electrode surface, and the overpotential increased. Electrochemical impedance spectroscopy (EIS) measurements were performed to analyze the resistance components of the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). The EIS results showed that the diffusion rate of hydroxide ions through the bubble-covering layer on the anode can be modeled by the Warburg impedance with a finite diffusion boundary. The migration rate of ions driven by the potential gradient in OER and HER was modeled by a tortuosity model with void fraction and bubble-covering layer thickness. A method for promoting bubble detachment via the addition of tert-butyl alcohol and external magnetic fields was introduced. Finally, a computational fluid dynamics (CFD) simulation of the gas-liquid two-phase flow and a deep-learning analysis method for the size distribution of crowded bubbles in an electrolysis cell were introduced.</p>
    <p>Alkaline water electrolysis (AWE) has attracted significant attention for producing hydrogen. One of the problems with AWE is the increase in overpotential, which is attributed to bubbles covering the electrode surface at high current densities. Therefore, understanding the relationship between the bubble formation behavior and reactant transfer mechanism is important for reducing the overpotential. In this study, an <i>operando</i> observation system for the oxygen and hydrogen bubble formation behavior on nickel wire electrodes was developed using a microscope-type high-speed video camera. The relationship between the current density-electrode potential curve and bubble generation behavior was then investigated. The results showed that the generation of oxygen/hydrogen bubbles was activated as current density increased. At a high current density, bubbles covered the electrode surface, and the overpotential increased. Electrochemical impedance spectroscopy (EIS) measurements were performed to analyze the resistance components of the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). The EIS results showed that the diffusion rate of hydroxide ions through the bubble-covering layer on the anode can be modeled by the Warburg impedance with a finite diffusion boundary. The migration rate of ions driven by the potential gradient in OER and HER was modeled by a tortuosity model with void fraction and bubble-covering layer thickness. A method for promoting bubble detachment via the addition of tert-butyl alcohol and external magnetic fields was introduced. Finally, a computational fluid dynamics (CFD) simulation of the gas-liquid two-phase flow and a deep-learning analysis method for the size distribution of crowded bubbles in an electrolysis cell were introduced.</p>

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Awards 【 display / non-display 】

  • 日本冷凍空調学会 学術賞

    2020   日本冷凍空調学会   霜層微細構造に及ぼす冷却面性状の影響

    Individual or group name of awards：松本 亮介, 西浦 雄人, 塩川 貴大, 槇原 拓郎, 小田 豊, 清水 智弘, 依岡 拓也, 荒木 拓人

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    日本冷凍空調学会賞：第48回 令和2年度受賞

  • 電気学会優秀論文発表賞

    2008.3    

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Other external funds procured 【 display / non-display 】

  • 超高効率プロトン伝導セラミック燃料電池デバイスの研究開発

    2020.7 - 2022.6

    Investigator(s)：荒木拓人

  • 粉体成膜プロセス研究のハイスループット化のためのデータ駆動型プロセス・インフォマティクス

    2019.11 - 2021.5

    Japan Science and Technology Agency  未来社会創造事業

    Investigator(s)：荒木拓人

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Presentations 【 display / non-display 】

  • OBSERVATION OF CONDENSATE DROPS FREEZING ON MICRO STRUCTURED METAL SURFACES PROCESSED BY WET ETCHING

    Kota Asaoka, Shoki Inoue, Tatsuya Mizusawa and Takuto Araki

    The 32nd International Symposium on Transport Phenomena 

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    Event date： 2022.3

    Language：English   Presentation type：Oral presentation (general)  

  • THREE-DIMENSIONAL ELECTRIC POTENTIAL SIMULATION WITH VARIOUS ELECTRODE GEOMETRIES IN PEM WATER ELECTROLYSIS

    Naruhisa Tsukase, Konosuke Watanabe, Takuto Araki, Taiki Ishida, Kensaku Nagasawa, Yoshiyuki Kuroda and Shigenori Mitsushima

    The 32nd International Symposium on Transport Phenomena 

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    Event date： 2022.3

    Language：English   Presentation type：Oral presentation (general)  

  • In Situ X-Ray Diffraction Study of Iridium Crystalline Structure Under Working Conditions of Proton Exchange Membrane Water Electrolysis

    K Shigemasa, M Shviro, Y Kuroda, S Mitsushima, M Carmo, T Araki

    ECS Meeting 

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    Event date： 2021.10

    Language：English   Presentation type：Oral presentation (general)  

  • Observation of Oxygen Bubble Growth near Anode Catalyst Electrode in PEM Water Electrolyzer

    Konosuke Watanabe, Kohei Wakuda, Kodai Wani, Takuto Araki, Kensaku Nagasawa, Shigenori Mitsushima

    ECS Meeting 

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    Event date： 2021.10

    Language：English   Presentation type：Oral presentation (general)  

  • MEMS sensor development for making PEFC catalyst layer during drying process

    Yoshifumi Hyugaji, Takuto Araki (Yokohama National University, Faculty of Engineering), Keisuke Nagato, Kohei Nagai, Takuya Tsujiguchi, Kota Asaoka, Daichi Suzuki

    The 2nd Asian Conference on Thermal Sciences  2021.10 

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    Event date： 2021.10

    Language：English   Presentation type：Oral presentation (general)  

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Charge of on-campus class subject 【 display / non-display 】

  • 2025   Applied Thermofluid Engineering Ⅱ

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2025   Applied Thermofluid Engineering Ⅰ

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2025   Cutting Edge of Fuel Cell Technology

    Graduate school of Engineering Science

  • 2025   Manufacturing of Thermal and Fluid Systems B

    Graduate school of Engineering Science

  • 2025   Manufacturing of Thermal and Fluid Systems A

    Graduate school of Engineering Science

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