Perovskite oxides are at the forefront of the race to develop catalysts/electrodes for fuel cells and electrolyzers. This work presents trifunctional properties of the double‐perovskite oxide PrBa_0.5Sr_0.5Co_1.5Fe_0.5O_5+δ and the PrBa_0.5Sr_0.5Co_1.5Fe_0.5O_5+δ−Ag composite prepared by the glycine nitrate process. The electrocatalytic studies reveal that the Ag‐based composite is an excellent catalyst for both oxygen evolution (OER) and hydrogen evolution reactions (HER) in alkaline solution. The electrochemical impedance spectroscopy analysis through distribution function of relaxation times (DFRT) suggests that the improved activity originates from the suppression of resistance contributed by various relaxation processes. The oxygen reduction reaction (ORR) kinetics in these oxide‐based cathodes has been studied by performing symmetric‐cell measurements at high temperatures using both oxygen‐ion and proton‐conducting cells. DC bias dependence of charge‐transfer processes, oxygen‐surface kinetics, polarization resistances, and activation energies are revealed by DFRT studies. Ag addition in PrBa_0.5Sr_0.5Co_1.5Fe_0.5O_5+δ leads to enhanced kinetics of OER, HER, and ORR.

中文翻译：

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用于燃料电池和电解池的三功能双钙钛矿氧化物催化剂。

钙钛矿氧化物在开发用于燃料电池和电解器的催化剂/电极的竞赛中处于最前沿。这项工作介绍了双钙钛矿氧化物PrBa _0.5 Sr _0.5 Co _1.5 Fe _0.5 O _{5+ δ}和PrBa _0.5 Sr _0.5 Co _1.5 Fe _0.5 O _{5+ δ的三功能性质。}-通过硝酸甘氨酸法制备的Ag复合物。电催化研究表明，基于Ag的复合材料是碱性溶液中氧释放（OER）和氢释放反应（HER）的出色催化剂。通过弛豫时间分布函数（DFRT）进行的电化学阻抗谱分析表明，改善的活性源自各种弛豫过程对电阻的抑制。通过在高温下使用氧离子和质子传导池进行对称池测量，研究了这些基于氧化物的阴极中的氧还原反应（ORR）动力学。DFRT研究揭示了电荷转移过程，氧表面动力学，极化电阻和活化能的直流偏置依赖性。在PrBa中添加Ag_0.5 Sr _0.5 Co _1.5 Fe _0.5 O _{5+ δ}导致OER，HER和ORR动力学增强。