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

Abstract

For the first time, Fe 3 O 4 -based high-entropy spinel oxides are studied for the electrochemical production of hydrogen peroxide. Among those investigated substances, (Fe 0.2 Zn 0.2 Co 0.2 Ni 0.2 Cu 0.2 ) Fe 2 O 4 shows significantly enhanced 2e - ORR electrocatalytic property. The H 2 O 2 selectivity is found to range from 69.48% to 85.78% under a wide potential window of 0.2 ~ 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 H 2 O 2 . • High-entropy oxide (Fe 0.2 Zn 0.2 Co 0.2 Ni 0.2 Cu 0.2 )Fe 2 O 4 is evaluated as efficient electrocatalyst for H 2 O 2 production. • The high-entropy electrocatalyst exhibits promising electrochemical performance with H 2 O 2 selectivity up to 85.78%. • The attractive performance is due to the oxygen vacancies and the co-interaction of multiple metal ions in high-entropy oxide.