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<p>The overall performance of aqueous metal-air batteries is restricted by the inherently slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Therefore, the development of bifunctional oxygen catalyst is essential to overcome the kinetic limitations of ORR and OER. Among various metal oxide-based catalysts, perovskite oxides have received substantial interest because of their remarkable catalytic activity and structural stability in alkaline media. In the present work, we report a monoclinic double perovskite oxide (Pr<sub>2</sub>MnCoO<sub>6</sub>) as a highly active bifunctional electrocatalyst. The structural differences between Pr<sub>2</sub>MnCoO<sub>6</sub> and the counterpart La<sub>2</sub>MnCoO<sub>6</sub> were investigated using X-ray diffraction (XRD) and ex situ X-ray absorption spectroscopy (XAS). Interestingly, Pr<sub>2</sub>MnCoO<sub>6</sub> showed increased local structural distortion and enhanced rock-salt ordering of the MnO<sub>6</sub> and CoO<sub>6</sub> octahedra compared with La<sub>2</sub>MnCoO<sub>6</sub>, which are suggested to influence electrocatalytic activities. Accordingly, Pr<sub>2</sub>MnCoO<sub>6</sub> exhibited remarkable catalytic activities during ORR and OER, reducing reliance on noble-metal catalysts for oxygen electrocatalysis.</p>

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Elucidating the Catalytic Activity of Lattice-Distorted Double Perovskite Oxides as Bifunctional Electrocatalysts

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Hyeosksu Kim,
  • Hak Sakong,
  • Sang-Hee Park,
  • Joohyuk Park

摘要

The overall performance of aqueous metal-air batteries is restricted by the inherently slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Therefore, the development of bifunctional oxygen catalyst is essential to overcome the kinetic limitations of ORR and OER. Among various metal oxide-based catalysts, perovskite oxides have received substantial interest because of their remarkable catalytic activity and structural stability in alkaline media. In the present work, we report a monoclinic double perovskite oxide (Pr2MnCoO6) as a highly active bifunctional electrocatalyst. The structural differences between Pr2MnCoO6 and the counterpart La2MnCoO6 were investigated using X-ray diffraction (XRD) and ex situ X-ray absorption spectroscopy (XAS). Interestingly, Pr2MnCoO6 showed increased local structural distortion and enhanced rock-salt ordering of the MnO6 and CoO6 octahedra compared with La2MnCoO6, which are suggested to influence electrocatalytic activities. Accordingly, Pr2MnCoO6 exhibited remarkable catalytic activities during ORR and OER, reducing reliance on noble-metal catalysts for oxygen electrocatalysis.