塔菲尔方程
过电位
析氧
电解质
无定形固体
化学
催化作用
氧气
无机化学
氢氧化物
价(化学)
分解水
材料科学
电化学
电极
物理化学
结晶学
有机化学
光催化
作者
Dazhong Zhong,Dong Wang,Tan Li,Lü Hao,Zhanhong Ma,Tao Zhao,Genyan Hao,Xiaoguang Wang,Guang Liu,Jinping Li,Qiang Zhao
标识
DOI:10.1016/j.jpowsour.2022.232444
摘要
NiFe-layered double hydroxide (NiFe–OH) is one of the most promising candidate materials for the oxygen evolution reaction (OER) in an alkaline electrolyte. However, it is difficult to be oxidized into Ni3+FeOOH active species with high valence Ni under mild conditions; thus, the activity under mild conditions is inferior. We report here that NiFe–OH is converted to amorphous NiFeOxHy (a3-NiFe-OH) with easily oxidized electron-deficient Ni2+ after pre-oxidation in an alkaline solution boosts the OER performance under mild conditions. The amorphous structure of a3-NiFe-OH also enlarges the electrochemically active area to expose more active sites. It merely needs an overpotential of 350 mV at 10 mA cm−2 in 0.1 M KHCO3 electrolyte. The corresponding Tafel slope is as low as 89 mV dec−1. This work affords a strategy for developing (near) neutral OER catalysts.
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