Development of a MnCO3-based Electrocatalyst for Water Oxidation from Rhodochrosite Ore

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  • Arisu Sakai
    Yamaguchi University, Tokiwadai, Ube, Yamaguchi 755-8611 , Japan
  • Kazuki Harada
    Yamaguchi University, Tokiwadai, Ube, Yamaguchi 755-8611 , Japan
  • Shun Tsunekawa
    Yamaguchi University, Tokiwadai, Ube, Yamaguchi 755-8611 , Japan
  • Yoshiaki Tamura
    University of Toyama, Gofuku, Toyama 930-8555 , Japan
  • Masaya Ito
    University of Toyama, Gofuku, Toyama 930-8555 , Japan
  • Keisuke Hatada
    University of Toyama, Gofuku, Toyama 930-8555 , Japan
  • Toshiaki Ina
    Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198 , Japan
  • Takumi Ohara
    Tokyo University of Science, Shinjuku Katsushika-ku, Tokyo 125-8585 , Japan
  • Ke-Hsuan Wang
    Tokyo University of Science, Shinjuku Katsushika-ku, Tokyo 125-8585 , Japan
  • Takeshi Kawai
    Tokyo University of Science, Shinjuku Katsushika-ku, Tokyo 125-8585 , Japan
  • Masaaki Yoshida
    Yamaguchi University, Tokiwadai, Ube, Yamaguchi 755-8611 , Japan

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<jats:title>Abstract</jats:title> <jats:p>An electrocatalyst based on a manganese carbonate mineral and intended to promote the water oxidation reaction was obtained by simply ball milling rhodochrosite ore. This material was found to catalyze the water oxidation reaction in a stable manner. Mn K-edge and O K-edge X-ray absorption fine structure (XAFS) analyses combined with theoretical simulations showed that the catalyst was composed of MnCO3 with slight distortions of the surface structure. Operando UV-vis absorption spectroscopy and linear combination fitting of XAFS spectra established that a portion of the MnCO3 surface was oxidized to MnO2. The MnO2 generated on the surface of this material likely provided active sites for the water oxidation reaction.</jats:p>

収録刊行物

  • Chemistry Letters

    Chemistry Letters 51 (7), 723-727, 2022-05-28

    Oxford University Press (OUP)

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