Yi Yunan, Wu Qianbao, Li Junshan, Yao Weitang, Cui Chunhua
Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China.
School of Mechanical Engineering, Chengdu University, Chengdu 610106, China.
ACS Appl Mater Interfaces. 2021 Apr 21;13(15):17439-17449. doi: 10.1021/acsami.0c22355. Epub 2021 Apr 8.
Perovskite oxide is a promising alternative to noble metal electrocatalysts for the oxygen evolution reaction (OER). However, as one of the most active oxide catalysts, cubic SrCoO presents poor OER performance relative to the theoretically predicted activity. Appropriate introduction of a guest component in the lattice and surface could largely promote the OER activity. Herein, we present a thermal-induced phase-segregation strategy to synthesize a heterostructured SrCoFeO/FeO (SC8F5) catalyst for OER. This novel perovskite/FeO heterostructure allows us to enhance the electrical conductivity ability, increase the Co oxidation state, and activate the surface oxygen to active oxygen species (O/O) for efficient OER. In contrast to the poor stability of SrCoFeO, we found that the SC8F5 heterostructure with segregated FeO on the surface can mitigate surface reconstruction and stabilize the catalyst structure, thereby increasing catalytic stability.
钙钛矿氧化物是用于析氧反应（OER）的贵金属电催化剂的一种有前途的替代品。然而，作为最具活性的氧化物催化剂之一，立方相SrCoO相对于理论预测的活性而言，其OER性能较差。在晶格和表面适当引入客体组分可极大地促进OER活性。在此，我们提出一种热诱导相分离策略来合成用于OER的异质结构SrCoFeO/FeO（SC8F5）催化剂。这种新型的钙钛矿/FeO异质结构使我们能够提高导电能力、增加Co的氧化态，并将表面氧活化为活性氧物种（O/O）以实现高效的OER。与SrCoFeO较差的稳定性相反，我们发现表面有分离的FeO的SC8F5异质结构可以减轻表面重构并稳定催化剂结构，从而提高催化稳定性。
