吸附
析氧
氧气
电解质
曲面重建
表面能
钙钛矿(结构)
化学工程
材料科学
空位缺陷
离子
化学
无机化学
电极
曲面(拓扑)
物理化学
电化学
结晶学
复合材料
有机化学
工程类
数学
几何学
作者
Ying Tang,Chao Wu,Zhang Qi,Haoyin Zhong,Anqi Zou,Junhua Li,Yang Ma,Hang An,Zhi Gen Yu,Shibo Xi,Junmin Xue,Xiaopeng Wang,Jiagang Wu
标识
DOI:10.1002/anie.202309107
摘要
A comprehensive understanding of surface reconstruction was critical to developing high performance lattice oxygen oxidation mechanism (LOM) based perovskite electrocatalysts. Traditionally, the primary determining factor of the surface reconstruction process was believed to be the oxygen vacancy formation energy. Hence, most previous studies focused on optimizing composition to reduce the oxygen vacancy formation energy, which in turn facilitated the surface reconstruction process. Here, for the first time, we found that adding oxyanions (SO42- , CO32- , NO3- ) into the electrolyte could effectively regulate the solid-liquid interface, significantly accelerating the surface reconstruction process and enhancing oxygen evolution reaction (OER) activities. Further studies indicated that the added oxyanions would adsorb onto the solid-liquid interface layer, disrupting the dynamic equilibrium between the adsorbed OH- ions and the OH- ions generated during surface reconstruction process. As such, the OH- ions generated during surface reconstruction process could be more readily released into the electrolyte, thereby leading to an acceleration of the surface reconstruction. Thus, it was expected that our finding would provide a new layer of understanding to the surface reconstruction process in LOM-based perovskite electrocatalysts.
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