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<p>The electronic and crystal structures of catalysts are crucial for designing novel oxygen reduction reactions (ORR) catalysts. In recent years, heterojunction catalysts have occupied a very important position in emerging catalysts. In heterojunction catalysts, the generation of lattice strain at the heterophase boundary can affect the catalytic properties. In this article, we regulate the strain effects by modulating the proportion of LaMnO<sub>3</sub> and Mn<sub>3</sub>O<sub>4</sub>, and it was revealed that there is a facilitating relationship between the 4e<sup>−</sup> ORR process and tensile strain, while compressive strain plays the opposite role. This is attributed to the stretched bond length reducing the covalency of the Mn-O bond, promoting the consumption of OOH* intermediates and enhancing the reversible stability of the structure. <i>In situ</i> attenuated total reflection infrared (ATR-IR) measurements were applied to investigate the mechanism for the consumption of intermediate, confirming the strain effects of heterojunction is a key factor in influencing the catalytic performance.</p>

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Heterojunction distortion engineering strain effect for selective 4-electron oxygen reduction

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Luohua Liu,
  • Huizhi Li,
  • Yue Zhai,
  • Li An,
  • Pinxian Xi

摘要

The electronic and crystal structures of catalysts are crucial for designing novel oxygen reduction reactions (ORR) catalysts. In recent years, heterojunction catalysts have occupied a very important position in emerging catalysts. In heterojunction catalysts, the generation of lattice strain at the heterophase boundary can affect the catalytic properties. In this article, we regulate the strain effects by modulating the proportion of LaMnO3 and Mn3O4, and it was revealed that there is a facilitating relationship between the 4e− ORR process and tensile strain, while compressive strain plays the opposite role. This is attributed to the stretched bond length reducing the covalency of the Mn-O bond, promoting the consumption of OOH* intermediates and enhancing the reversible stability of the structure. In situ attenuated total reflection infrared (ATR-IR) measurements were applied to investigate the mechanism for the consumption of intermediate, confirming the strain effects of heterojunction is a key factor in influencing the catalytic performance.