Cuboid-like phosphorus-doped metal–organic framework-derived CoSe2 on carbon cloth as an advanced bifunctional oxygen electrocatalyst for rechargeable zinc-air batteries

• Published in: Journal of colloid and interface science 2023-03, Vol.633, p.424-431
• Main Authors: Mi, Hongtian, Li, Leyuan, Zeng, Chuitao, Jin, Yuhong, Zhang, Qianqian, Zhou, Kailing, Liu, Jingbing, Wang, Hao
• Format: Article
• Language: English
• Subjects: Bifunctional oxygen catalyst; Cobalt selenide; Metal-organic frameworks; Phosphorus doping; Zinc-air battery
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2022.11.116

[Display omitted] •Self-supporting P-doped transition metal selenide/carbon composite is designed.•As-prepared P-CoSe2/C@CC shows an overpotential of 303.1 mV at 10 mA cm−2 for OER.•P-CoSe2/C@CC displays an obvious reduction peak for ORR.•Zinc-air battery with P-CoSe2/C@CC shows a peak power density of 124.4 mW cm−2.•The enhanced catalytic performance is attributed to the P-doping effect. Zinc-air batteries (ZABs) are regarded as attractive devices for electrochemical energy storage and conversion due to their outstanding electrochemical performance, low price, and high safety. However, it remains a challenge to design a stable and efficient bifunctional oxygen catalyst that can accelerate the reaction kinetics and improve the performance of ZABs. Herein, a phosphorus-doped transition metal selenide/carbon composite catalyst derived from metal-organic frameworks (P-CoSe2/C@CC) is constructed by a self-supporting carbon cloth structure through a simple solvothermal process with subsequent selenization and phosphatization. The P-CoSe2/C@CC exhibits a low overpotential of 303.1 mV at 10 mA cm−2 toward the oxygen evolution reaction and an obvious reduction peak for the oxygen reduction reaction. The abovementioned electrochemical performances for the P-CoSe2/C@CC are attributed to the specific architecture, the super-hydrophilic surface, and the P-doping effect. Remarkably, the homemade zinc-air battery based on our P-CoSe2/C@CC catalyst shows an expected peak power density of 124.4 mW cm−2 along with excellent cycling stability, confirming its great potential application in ZABs for advanced bifunctional electrocatalysis.