Affiliation:
1. Heilongjiang Provincial Key Laboratory of Surface Active Agent and Auxiliary College of Chemistry and Chemical Engineering Qiqihar University Heilongjiang Province 161006 China
2. Institute of Physical Chemistry College of Chemistry Jilin University Changchun 130021 China
Abstract
AbstractOxygen 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.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Jilin Province
Subject
General Chemistry,Catalysis,Organic Chemistry