Strong Electronic Interaction in High-Entropy Oxide Enhances Oxygen Evolution Reaction

Luo Huang; Lixia Ma; Jing Xu; Baoqiang Wei; Yanzhong Xue; Nan Zhang; Xiaojie Zhou; Jie Yang; Zong-Huai Liu; Ruibin Jiang

doi:10.1021/acs.inorgchem.4c00778

Strong Electronic Interaction in High-Entropy Oxide Enhances Oxygen Evolution Reaction

Inorg Chem. 2024 Jul 8;63(27):12433-12444. doi: 10.1021/acs.inorgchem.4c00778. Epub 2024 Jun 22.

Authors

Luo Huang¹, Lixia Ma¹, Jing Xu², Baoqiang Wei¹, Yanzhong Xue¹, Nan Zhang¹, Xiaojie Zhou¹, Jie Yang¹, Zong-Huai Liu¹, Ruibin Jiang¹

Affiliations

¹ Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, China.
² Experimental Teaching Department, Northwest Minzu University, Lanzhou 730030, P. R. China.

PMID: 38907721
DOI: 10.1021/acs.inorgchem.4c00778

Abstract

High-entropy oxides are a new type of material with significant application potential. However, the lack of a universal HEO preparation method severely limits the property study and application of HEOs. Herein, we report a universal approach of spray pyrolysis for the preparation of various HEOs and study the electrocatalytic performance of HEOs toward the oxygen evolution reaction. FeCoNiMoWO_x HEO exhibits an overpotential of 281 mV at 10 mA cm^-2 and a Tafel slope of 34.5 mV dec^-1, which are far superior to those of the corresponding medium-entropy oxide and low-entropy oxide. It is found that the high entropy of the HEO greatly strengthens the interaction between Fe and Mo/W and produces abundant oxygen vacancies (OVs) around Mo and W. This work not only provides a universal preparation method for HEOs but also deepens our understanding of OER catalytic activity of HEOs.