High-entropy oxide (Fe0.2Zn0.2Co0.2Ni0.2Cu0.2)Fe2O4: An efficient and stable spinel-type electrocatalyst for H2O2 production in alkaline media

For the first time, Fe3O4-based high-entropy spinel oxides are studied for the electrochemical production of hydrogen peroxide. Among those investigated substances, (Fe0.2Zn0.2Co0.2Ni0.2Cu0.2) Fe2O4 shows significantly enhanced 2e-ORR electrocatalytic property. The H2O2 selectivity is found to range from 69.48% to 85.78% under a wide potential window of 0.2 similar to 0.65 V with excellent durability up to 24 h. The improved performance is attributed to the high concentration of oxygen vacancies on the material surface and the multicomponent co-interaction in the high-entropy oxide. We believe this finding will broaden the application of high-entropy spinel oxide catalysts for viable electrochemical production of H2O2. (c) 2022 Published by Elsevier B.V.

Automated summary

For the first time, Fe3O4-based high-entropy spinel oxides were studied for the electrochemical production of hydrogen peroxide. Among the substances investigated, (Fe0.2Zn0.2Co0.2Ni0.2Cu0.2) Fe2O4 showed significantly enhanced 2e-ORR electrocatalytic property, with excellent selectivity and durability. The improved performance is attributed to the high concentration of oxygen vacancies on the material surface and the multicomponent co-interaction in the high-entropy oxide.