Perovskite oxides have attracted great attention in electrochemistry due to their compositional and structural flexibility. Herein, microwave/ultrasound assisted hydrothermal procedures were developed to synthesize Ce-doped LaCoO₃ perovskite oxide as bifunctional electrocatalysts for OER and HER application, achieving highly efficient bifunctional catalytic performance. The obtained LCC4 exhibited excellent electrocatalytic activity with an overpotential of 380 mV and 305 mV at 10 mA cm⁻² toward OER and HER, respectively. The lower Tafel slopes of 80 mV per decade and 144 mV per decade for OER and HER, respectively, indicated the faster reaction kinetics for the improved inherent electrocatalytic activity. The outstanding long-term durability of LCC4 in alkaline conditions was also vital to the practical applications of water electrolysis. The improved bifunctional electrocatalytic activity was attributed to the synergistic effects of excellent conductivity and enriched active sites arising from A-site substitution. This work not only provides an efficient strategy for the development of perovskite oxide-based electrocatalysts but also puts forward a new insight on bifunctional electrocatalysts for overall water splitting.

中文翻译：

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LaCoO3钙钛矿氧化物中的铈取代作为氢和氧析出反应的双功能电催化剂

钙钛矿氧化物由于其组成和结构的灵活性而在电化学中引起了极大的关注。在此，开发了微波/超声辅助水热程序以合成 Ce 掺杂的 LaCoO ₃钙钛矿氧化物作为用于 OER 和 HER 应用的双功能电催化剂，实现高效的双功能催化性能。获得的LCC4表现出优异的电催化活性，在10 mA cm ^{-2 下的}过电位分别为380 mV和305 mV分别针对 OER 和 HER。OER 和 HER 的较低 Tafel 斜率分别为 80 mV/十年和 144 mV/十年，表明改善的固有电催化活性具有更快的反应动力学。LCC4 在碱性条件下出色的长期耐久性对于水电解的实际应用也至关重要。改进的双功能电催化活性归因于优异的导电性和 A 位取代产生的富集活性位点的协同作用。这项工作不仅为钙钛矿氧化物基电催化剂的开发提供了有效的策略，而且为双功能电催化剂用于整体水分解提出了新见解。