Citation: Qixin Zhang, Lizhong Liu, Lulu Song, Chuxin Wu, Yi Zhao, Lunhui Guan. A MOF-to-MOF Conversion Assisted Formation of Hierarchical Hollow Zn-Co1-xS/C@C Composite for Efficient Potassium-ion Storage[J]. Chinese Journal of Structural Chemistry, ;2023, 42(6): 100092. doi: 10.1016/j.cjsc.2023.100092 shu

A MOF-to-MOF Conversion Assisted Formation of Hierarchical Hollow Zn-Co1-xS/C@C Composite for Efficient Potassium-ion Storage

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 hierarchical 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.
- MOF conversion,
- Hollow structure,
- Cobalt sulfide,
- Element doping,
- Potassium-ion batteries
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