A MOF-to-MOF conversion assisted formation of hierarchical hollow Zn-Co1-xS/C@C composite for efficient potassium-ion storage
Chinese Journal of Structural Chemistry(2023)
摘要
Hollow structured composite can enhance the structural stability of metal sulfide anode by accommodating its volume variation,while the performance is still hindered by its poor electron/ion conductivity.Herein,we develop a hier-archical hollow structure to achieve superior electrochemical performance,from which a MOF-to-MOF conversion is utilized to generate hollow Zn-Co1-xS/C composite followed with additional carbon coating layer.For potassium storage,as-prepared hollow Zn-Co1.xS/C@C composite displays high capacities of 375 mA h g-1 after 100 cycles at 0.2 A g-1 and 201 mA h g-1 after 500 cycles at 1 A g-1.Moreover,it also manifests outstanding rate capability of 200 mA h g-1 at 10 A g-1,outperforming hollow Co1-xS@C and majority of the reported cobalt-based anodes.With illustration by kinetics analysis and theoretical calculation,both of Zn doping and internal carbon matrix are conductive to promote the charge transportation ability of Co1-xS,thus accounting for the good cycling behavior and excellent rate capacity of hierarchical hollow Zn-Co1.xS/C@C composite.
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关键词
MOF conversion,Hollow structure,Cobalt sulfide,Element doping,Potassium-ion batteries
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