过电位
分解水
析氧
催化作用
电化学
电解水
材料科学
化学工程
异质结
制氢
拉曼光谱
氢
密度泛函理论
阳极
电解
无机化学
电极
化学
光催化
物理化学
光电子学
计算化学
光学
物理
工程类
电解质
有机化学
生物化学
作者
Xinhong Chen,Yumeng Cheng,Yunzhou Wen,Yaya Wang,Xiao Yan,Jun Wei,Sisi He,Jia Zhou
标识
DOI:10.1002/advs.202204742
摘要
Abstract Highly efficient electrochemical water splitting is of prime importance in hydrogen energy but is suffered from the slow kinetics at the anodic oxygen evolution reaction. Herein, combining the surface activation with the heterostructure construction strategy, the CoP/Fe‐Co 9 S 8 heterostructures as the pre‐catalyst for highly efficient oxygen evolution are successfully synthesized. The catalyst only needs 156 mV to reach 10 mA cm −2 and keeps stable for more than 150 h. Inductively coupled plasma optical emission spectrometry, in situ Raman spectroscopy and density functional theory calculations verify that the introduction of Fe can promote the formation of highly active Co(IV)–O sites and lead to a self‐termination of surface reconstruction, which eventually creates a highly active and stable oxygen evolution catalytic surface. Besides, the catalyst also demonstrates high hydrogen evolution reaction activity with an overpotential of 62 mV@10 mA cm −2 . Benefiting from its bifunctionality and self‐supporting property, the membrane electrode assembly electrolyzer equipped with these catalysts achieves high overall water splitting efficiency of 1.68 V@1 A cm −2 .
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