塔菲尔方程
析氧
过电位
电催化剂
X射线光电子能谱
催化作用
分解水
化学工程
镍
化学
电化学
材料科学
物理化学
光催化
电极
工程类
生物化学
有机化学
作者
Mei Tang,Xihao Liu,Asad Ali,You-Me He,Peikang Shen,Yifang Ouyang
标识
DOI:10.1016/j.jcis.2023.01.021
摘要
Developing high-performance and low-cost electrocatalysts for oxygen evolution reaction (OER) and understanding the phase evolution in the catalytic process are vital to improving the overall efficiency of electrochemical water splitting. Herein, a hybrid heterogeneous [email protected]2O3@Ni(OH)2 electrocatalyst with robust OER intrinsic activity and a low overpotential of 269 mV to obtain a current density of 100 mA cm−2 and a Tafel slope value of 60.15 mV dec−1 is effectively prepared. The dynamic surface evolution has been detected by in-situ Raman spectroscopy, which exposes that [email protected]2O3@Ni(OH)2 is reconstituted as Ni(Fe)OOH demonstrated as catalytically active species under high potential. X-ray photoelectron spectroscopy analysis indicates that partial electrons of Ni in the heterogeneous interface transfer to Fe. Furthermore, partial Fe doping of NiOOH under high potential accompanied by the oxidized Ni3+ with optimized d-orbit electronic configuration for nearly unity eg occupancy results in proper chemisorption bonding strength for oxygen reaction intermediates and is conducive to enhancing OER reaction kinetics. This work provides ideas that multicomponent heterostructure can adjust the electronic structure of iron and nickel to enhance the intrinsic activity of OER, which could help with the design and synthesis of high-performance OER catalysts used in energy storage and conversion.
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