Synergistic Effect between Fe⁴⁺ and Co⁴⁺ on Oxygen Evolution Reaction Catalysis for CaFe[1-x]Co[x]O₃

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  • Yamada Ikuya
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • Tanaka Atsushi
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Oda Seiji
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Okazaki Yuichi
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Toda Fumito
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Kato Yuta
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Kizawa Yuta
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Oshita Masaya
    Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • Goto Manami
    Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • Morimura Amane
    Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • Ochi Asuka
    Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • Toda Kaoru
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Wang Wencong
    Institute of Industrial Science, The University of Tokyo
  • Yamamoto Hajime
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Ikeno Hidekazu
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • Yagi Shunsuke
    Institute of Industrial Science, The University of Tokyo

書誌事項

タイトル別名
  • Synergistic Effect between Fe<sup>4+</sup> and Co<sup>4+</sup> on Oxygen Evolution Reaction Catalysis for CaFe<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>O<sub>3</sub>

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抄録

<p>Chemical substitution is an effective way to improve electrocatalytic properties in transition metal oxides. We investigate the synergistic effect between Fe4+ and Co4+ ions on the catalytic activity for oxygen evolution reaction (OER) in the Fe–Co-mixed perovskite oxide CaFe1−xCoxO3. The OER activity of CaFe1−xCoxO3 is substantially increased by small amounts of Co (Fe) doping into CaFeO3 (CaCoO3), leading to the superiority compared to the pure Fe and Co perovskite oxides. The x dependences of the OER overpotential and specific activity for CaFe1−xCoxO3 (0.05 ≦ x ≦ 0.95) are expressed by constant offset from the weighted average between CaFeO3 and CaCoO3, which can be interpreted to be the synergistic effect between Fe4+ and Co4+ ions on OER activity. The absence of the optimum x for the highest activity for CaFe1−xCoxO3 contrasts with the volcano-like plots reported in various mixed-metal oxides. First-principle calculations using the special quasirandom structure models on CaFe1−xCoxO3 (x = 0.03–0.5) demonstrate that about half the amount of Fe4+ is electronically activated to possess smaller charge-transfer energies, corroborating the enhancement of catalytic activity in CaFe1−xCoxO3. These findings provide new insight into the synergistic effects in complex transition metal oxide catalysts.</p>

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (9), 2097-2104, 2023-09-01

    公益社団法人 日本金属学会

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