催化作用
铱
过渡金属
氧气
化学
析氧
钙钛矿(结构)
无机化学
化学稳定性
金属
物理化学
电化学
结晶学
有机化学
电极
生物化学
作者
Xiao Liang,Wensheng Yan,Yang Yu,Kexin Zhang,Wei An,Hui Chen,Yongcun Zou,Xiao Zhao,Xiaoxin Zou
标识
DOI:10.1002/anie.202311606
摘要
Improving catalytic activity without loss of catalytic stability is one of the core goals in search of low-iridium-content oxygen evolution electrocatalysts under acidic conditions. Here, we synthesize a family of 66 SrBO3 perovskite oxides (B=Ti, Ru, Ir) with different Ti : Ru : Ir atomic ratios and construct catalytic activity-stability maps over composition variation. The maps classify the multicomponent perovskites into chemical groups with distinct catalytic activity and stability for acidic oxygen evolution reaction, and highlights a chemical region where high catalytic activity and stability are achieved simultaneously at a relatively low iridium level. By quantifying the extent of hybridization of mixed transition metal 3d-4d-5d and oxygen 2p orbitals for multicomponent perovskites, we demonstrate this complex interplay between 3d-4d-5d metals and oxygen atoms in governing the trends in both activity and stability as well as in determining the catalytic mechanism involving lattice oxygen or not.
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