Статья

Adjusting the electron configuration of MOFs-derived Ag/MnO1.1@C via electron transfer strategy to achieve a high-performance catalyst for potassium-oxygen batteries

Shuming YuInstitute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013 Liaoning, ChinaKedi CaiInstitute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013 Liaoning, ChinaHao ZhaoInstitute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013 Liaoning, ChinaTan WangBeijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaTingting QuMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001 Heilongjiang, ChinaLan LiInstitute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013 Liaoning, ChinaJinchuang LiSchool of Electrical Engineering, Xi’an Jiaotong University, Xian 710049 Shaanxi, ChinaChuangang YaoInstitute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013 Liaoning, ChinaXiaoshi LangInstitute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013 Liaoning, China

2025en

ABI

Аннотация

• Ag/MnO 1.1 @C composite constructed via MOF derivative as K-O 2 battery cathode catalyst. • The electron transfer between Ag and MnO to modulate the surface electronic structure. • Ag-MnO coupling lowers reaction energy barriers to enhance electrocatalytic activity. • The oxygen vacancies enhance O 2 adsorption to promote faster formation of KO 2 . Potassium-oxygen (K-O 2 ) batteries can offer high energy density and low cost, but suffer from poor cycle life due to low efficiency and slow kinetics. Therefore, the development of efficient catalysts is the key to solve the problems. In this study, an efficient Ag/MnO 1.1 @C composite is designed as a catalytic cathode for K-O 2 batteries via calcining MnAg-MOFs precursors. The porous chain structure of the material facilitates the storage of discharge products and diffusion of oxygen, while the oxygen vacancies enhance the adsorption of O 2 and catalytic activity. Furthermore, the interfacial electron transfer between Ag and MnO 1.1 induces surface charge redistribution, facilitating improved electrochemical reaction kinetics that effectively promote both formation and decomposition of the discharge product. And then, the coupling effect between Ag and MnO further promotes the electron transfer in the K-O 2 battery, which greatly enhances the ORR and OER activities. As a result, the Ag/MnO 1.1 @C composite as an air cathode for K-O 2 batteries show a specific initial discharge capacity of 2328 mAh g −1 (200 mAh g −1 limiting capacity) and 145 stable cycles.

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Идентификаторы

DOI: 10.1016/j.apsusc.2025.163863

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