过电位
析氧
纳米花
尖晶石
双金属片
电催化剂
化学工程
材料科学
分解水
无机化学
化学
催化作用
纳米技术
电极
金属
电化学
物理化学
纳米结构
冶金
生物化学
光催化
工程类
作者
Yuhang Sun,Tianmi Tang,Liyuan Xiao,Jingyi Han,Xue Bai,Mingyuan Shi,Siyu Chen,Jingru Sun,Yuanyuan Ma,Jingqi Guan
标识
DOI:10.1002/chem.202303779
摘要
Oxygen evolution reaction (OER) is the key anode reaction of electrolytic water. To improve the slow OER kinetics, we synthesize nanoflower‐like Co‐Fe‐Cr‐Mo‐Mn high‐entropy spinel (HES) nanosheets on nickel foam (NF) by one‐step solvothermal method, which exhibit an overpotential (η10) of only 188 mV at 10 mA cm‐2, much lower than bimetallic CoFeOx/NF (233 mV), trimetallic CoFeCrOx/NF (211 mV), and tetrametallic CoFeCrMoOx/NF (200 mV). The OER overpotential decreases with the increase of the number of metals, indicating that the formation of HES has a positive effect on the improvement of electrocatalytic performance, since the synergistic effect between different metals enhances the charge transfer rate and decreases reaction barrier. In‐situ Raman spectra demonstrate that the formation of γ‐NiOOH on the HES surface is a crucial active species for the OER. This work demonstrates a simple and efficient synthesis method to prepare nanoflower‐like high‐entropy electrocatalysts for efficient OER electrocatalysis.
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