Tuning Electronic Structure of CuCo2O4 Spinel via Mn‐Doping for Enhancing Oxygen Evolution Reaction

• DOI: 10.1002/celc.202200933
• Publication Date: 2022-12-23T18:38:05Z
• Authors: Xuanmeng He; Tong Qiao; Beijun Li; Zeqin Zhang; Shaolan Wang; Xinzhen Wang; Hui Liu
• Keywords: Overpotential; Oxygen evolution

Abstract Cobalt‐based spinel oxide is a promising electrocatalyst for oxygen evolution reaction (OER) because of its low cost, excellent activity and stability. Herein, we designed the CuMn x Co 2 O 4 with tunable electronic structure via Mn‐doping to enhance OER performance. Results showed that 0.5 catalyst prepared by calcined at 600°C exhibited high crystalline without impurity phase, possessed enhanced 2+ /Co 3+ ratio concentration vacancies, which were facilitated Electrochemical test results had performance overpotential 340 mV current density 10 mA ⋅ cm −2 smaller Tafel slope 69.8 dec −1 . TOF ECSA illustrated more intrinsic catalytic on catalyst. After 1000 cycles, stability 8 1.7 % retention rate. The enhancement mechanism was further analyzed, mainly ascribed conversion variable vacancies.