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Highly active postspinel-structured catalysts for oxygen evolution reaction.

Yuichi Okazaki1, Seiji Oda1, Akihiko Takamatsu2

  • 1Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University 1-1 Gakuen-cho, Naka-ku, Sakai Osaka 599-8531 Japan yamada@mtr.osakafu-u.ac.jp ikeno@mtr.osakafu-u.ac.jp.

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|April 15, 2022
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Summary
This summary is machine-generated.

Highly active catalysts for oxygen evolution reaction (OER) were designed using postspinel oxides. These CaB2O4 materials show enhanced OER activity due to lower charge-transfer resistance and a novel OER mechanism.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is crucial for energy conversion applications.
  • Developing highly active and stable OER catalysts is essential.
  • Postspinel-structured oxides offer potential as advanced OER catalysts.

Purpose of the Study:

  • To investigate the OER activity of postspinel-structured oxides CaB2O4 (B = Cr, Mn, Fe).
  • To understand the structure-activity relationship and mechanism of these catalysts.
  • To propose a rational design principle for efficient OER electrocatalysts.

Main Methods:

  • Synthesis and electrochemical characterization of CaB2O4 catalysts.
  • Electrochemical impedance spectroscopy (EIS) to analyze charge-transfer resistance.
  • Density-functional-theory (DFT) calculations to elucidate the OER mechanism.

Main Results:

  • CaB2O4 series exhibited superior OER activity compared to perovskite and spinel oxides.
  • Lower charge-transfer resistances were identified as the reason for enhanced activity.
  • DFT calculations revealed a novel OER mechanism involving lattice oxygen and adsorbed oxygen.

Conclusions:

  • Postspinel CaB2O4 oxides are promising electrocatalysts for the oxygen evolution reaction.
  • The study highlights a structure-driven design approach for OER catalysts.
  • A novel OER mechanism was proposed, offering new avenues for catalyst development.