材料科学
电子结构
过渡金属
外延
电催化剂
同步加速器
钙钛矿(结构)
化学物理
催化作用
结晶学
物理化学
凝聚态物理
纳米技术
电化学
化学
电极
物理
核物理学
生物化学
图层(电子)
作者
Abel Fernández,Lucas Caretta,Sujit Das,Christoph Klewe,Djamila Lou,Eric Parsonnet,Ran Gao,Aileen Luo,Padraic Shafer,Lane W. Martin
标识
DOI:10.1002/aenm.202102175
摘要
Abstract Epitaxial strain has been shown to produce dramatic changes to the orbital structure in transition metal perovskite oxides and, in turn, the rate of oxygen electrocatalysis therein. Here, epitaxial strain is used to investigate the relationship between surface electronic structure and oxygen electrocatalysis in prototypical fuel cell cathode systems. Combining high‐temperature electrical‐conductivity‐relaxation studies and synchrotron‐based X‐ray absorption spectroscopy studies of La 0.5 Sr 0.5 CoO 3 and La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3 thin films under varying degrees of epitaxial strain reveals a strong correlation between orbital structure and catalysis rates. In both systems, films under biaxial tensile strain simultaneously exhibit the fastest reaction kinetics and lowest electron occupation in the d z 2 orbitals. These results are discussed in the context of broader chemical trends and electronic descriptors are proposed for oxygen electrocatalysis in transition metal perovskite oxides.
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