Development of a Hemispherical Cavity Cobalt Electrocatalyst for Water Oxidation Based on a Polystyrene Colloidal Template Electrodeposition Method

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  • Yusaku Araki
    Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
  • Shun Tsunekawa
    Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
  • Arisu Sakai
    Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
  • Kazuki Harada
    Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
  • Ryosuke Nagatsuka
    Department of Industrial Chemistry Tokyo University of Science Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan
  • Masako Suzuki‐Sakamaki
    Graduate School of Science and Technology Gunma University Kiryu Gunma 376-8515 Japan
  • Kenta Amemiya
    Institute of Materials Structure Science High Energy Accelerator Research Organization Oho Tsukuba Ibaraki 305-0801 Japan
  • Ke‐Hsuan Wang
    Department of Industrial Chemistry Tokyo University of Science Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan
  • Takeshi Kawai
    Department of Industrial Chemistry Tokyo University of Science Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan
  • Masaaki Yoshida
    Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan

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<jats:title>Abstract</jats:title><jats:p>Hydrogen production through water electrolysis using renewable energy is expected to be one approach to solving current energy problems. The present report describes the development of a hemispherical cavity cobalt (Co) electrocatalyst with uniform pores with sizes of several hundred nanometers on the surface <jats:italic>via</jats:italic> electrodeposition on an indium tin oxide (ITO) substrate in a carbonate electrolyte solution using a polystyrene particle template. Catalytic activity measurements indicated that the cavity Co catalyst generated a greater oxygen evolution current compared to the flat Co catalyst. To investigate the electronic state and local structure, operando Co K‐edge XAFS measurements of the cavity Co catalyst were obtained under working conditions, which showed that Co species in the catalyst changed to one with a higher oxidation number while maintaining the local structure of CoOOH (CoO<jats:sub>6</jats:sub>). These results clarified that the cavity Co catalyst efficiently promoted water splitting through the uniform nanoscale pores with high oxidation Co in the CoOOH structure.</jats:p>

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