过电位
乙二醇
合金
循环伏安法
电催化剂
扫描电子显微镜
催化作用
材料科学
沉积(地质)
氢
化学工程
无机化学
无水的
电化学
核化学
化学
冶金
物理化学
有机化学
电极
复合材料
古生物学
沉积物
工程类
生物
作者
Xian He,Ruqing Guo,Qingtian Zou,Jingjing Yang,Zhousi Hu,Luye Wu
标识
DOI:10.1016/j.tsf.2023.140093
摘要
The co-deposition behavior of Co+2 and Fe+2 in ethylene glycol (EG) are investigated using cyclic voltammetry (CV) techniques. These results imply that Co+2 species can accelerate the Co-Fe co-deposition, while Fe+2 can inhibit the reduction of Co+2. Moreover, the two effects can be improved as Co+2 or Fe+2 concentration increases. Microstructural and compositional characteristics of the samples show that Co-Fe deposits with various Fe content can be obtained from anhydrous FeCl2 and CoCl2 in EG. Scanning electron microscopy imaging of the surfaces of these Co-Fe alloy coatings shows that they present a dense structure with spherical “nodules”, the size of which is related to the Fe content. The electrocatalytic activity for hydrogen evolution reaction (HER) on the Co-Fe coatings is also investigated. These results indicate that its electrocatalytic activity can be improved as Fe contents increase from 2.2 to 9.8 wt.% and the Co-Fe alloy with 9.8 wt.% Fe exhibits the high electrocatalytic activity for HER with an overpotential of 124 mV at 10 mA cm−2 in 1 M KOH.
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