Ji Dingwei, Liu Changhai, Yao Yanhua, Luo Linlin, Wang Wenchang, Chen Zhidong
School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China.
Nanoscale. 2021 Jun 14;13(22):9952-9959. doi: 10.1039/d1nr00069a. Epub 2021 Jun 1.
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 LaCoO 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 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.
钙钛矿氧化物因其组成和结构的灵活性而在电化学领域备受关注。在此，开发了微波/超声辅助水热法来合成铈掺杂的LaCoO钙钛矿氧化物作为用于析氧反应（OER）和析氢反应（HER）的双功能电催化剂，实现了高效的双功能催化性能。所制备的LCC4表现出优异的电催化活性，在10 mA cm下对OER和HER的过电位分别为380 mV和305 mV。OER和HER的塔菲尔斜率分别为每十倍80 mV和每十倍144 mV，表明改进后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。双功能电催化活性的提高归因于A位取代产生的优异导电性和丰富活性位点的协同效应。这项工作不仅为基于钙钛矿氧化物的电催化剂的开发提供了一种有效策略，还为全水分裂的双功能电催化剂提出了新的见解。
