塔菲尔方程
催化作用
过电位
吸附
活动中心
析氧
化学工程
材料科学
无机化学
电解质
X射线光电子能谱
介电谱
化学
电化学
电极
物理化学
有机化学
工程类
作者
Tao Yu,Ruimin Ding,Fan Quan,Zhiyuan Ni,Xuanwen Liu,Yan He,Wenning Mu,Xuefei Lei,Yuhan Mo
标识
DOI:10.1016/j.ijhydene.2023.07.105
摘要
The development of high activity catalysts with excellent durability is a great challenge to realize the industrialization of electrolytic water oxygen evolution. In this work, Ag nanoparticles modified cross column nickel-iron hydroxyl oxide system (NiFeAg) nanocomposites were synthesized by a two-step strategy. Through XPS spectrum, Tafel slope, and EIS electrochemical impedance spectroscopy, it was found that Ag mainly plays a conductive role, accelerates charge transfer, and adjusts the surface electronic structure, to improve the activity of the catalyst. Impressive is the overall hydrolysis performance, with a current density of 10 mA cm−2 achieved at an overpotential of 211 mV, which shows better performance than other catalysts reported in the literature. Finally, through the theoretical calculation of the determination steps of adsorption energy and rate of oxygen-containing intermediates, it is determined that the active center of the catalyst is mainly Ni site. According to the theory of D-band center, Ag can effectively adjust the D-band center, thereby adjusting the adsorption strength of Ni sites on the surface of NiFe catalyst to adsorbent, and finally improving the OER performance of the catalyst.
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