尖晶石
材料科学
催化作用
氧气
组态熵
X射线光电子能谱
氧化物
化学物理
熵(时间箭头)
化学工程
热力学
化学
冶金
工程类
物理
有机化学
生物化学
作者
Yue Zhang,Tao Lü,Yike Ye,Weiji Dai,Yabo Zhu
标识
DOI:10.1021/acsami.0c05916
摘要
We used entropy engineering to design a series of CoFe2O4-type spinels. Through microstructural characterization, electrochemical measurements, and X-ray photoelectron spectroscopy, we demonstrated that the entropy-stabilized oxide (Co0.2Mn0.2Ni0.2Fe0.2Zn0.2)Fe2O4 has a single-phase spinel structure and exhibits both efficient and stable catalytic oxygen evolution. This is attributable to disordered occupation of multivalent cations, which induces severe lattice distortion and increases configurational entropy, thereby facilitating formation of structurally stable, high-density oxygen vacancies on the exposed surface of the spinel. Thus, more catalytic sites on the surface are activated and retained over the course of long-duration testing for oxygen evolution. Entropy engineering expands researchers’ access to catalysts that link entropy-stabilized structures to useful properties.
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