Issue 6, 2022

Nanosized high entropy spinel oxide (FeCoNiCrMn)3O4 as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Abstract

High-entropy oxides (HEOs) with a multi-component single-phase structure are considered as promising electrocatalysts for the oxygen evolution reaction due to their good catalytic activity and tailorable electrochemical properties. Herein, a series of small-sized non-noble metal-based HEO nanoparticles composed of five transition metal elements of Fe, Co, Ni, Cr, and Mn are synthesized via a simple solvothermal strategy followed by different-temperature heat treatment. The HEO treated at 400 °C exhibits the best catalytic activity with an overpotential of 288 mV at a current density of 10 mA cm−2 and outstanding stability (potential change of only 1.3% after a 95 h OER test at 10 mA cm−2) in 1 M KOH electrolyte, outperforming the commercial RuO2 electrocatalysts. The excellent catalytic performance, including the low overpotential, fast dynamics, and superb long-term durability, is mainly attributed to the advantages of the large number of active sites provided by ultra-small nanoparticles, the synergistic effect of various catalytically active metal elements, and the entropy stabilization effect. Therefore, this work enriches the selection of high-entropy oxide elements, provides an idea for solving the current problems of traditional methods, and develops a prospective material for OER catalysts.

Graphical abstract: Nanosized high entropy spinel oxide (FeCoNiCrMn)3O4 as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
21 Dec. 2021
Accepted
09 Febr. 2022
First published
10 Febr. 2022

Sustainable Energy Fuels, 2022,6, 1479-1488

Nanosized high entropy spinel oxide (FeCoNiCrMn)3O4 as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

C. Duan, X. Li, D. Wang, Z. Wang, H. Sun, R. Zheng and Y. Liu, Sustainable Energy Fuels, 2022, 6, 1479 DOI: 10.1039/D1SE02038B

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