ZnO/rGO/C composites derived from metal–organic framework as advanced anode materials for Li-ion and Na-ion batteries
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A novel ZnO/reduced graphene oxide/carbon (ZnO/rGO/C) composite is synthesized by pyrolysis of Zn-based metal–organic framework where graphene oxide and the glucose are imported as carbon sources. As a result, ZnO nanoparticles dispersing on a uniform reduced graphene sheet with a thin carbon layer construct a unique structure, which can prevent the aggregation of ZnO, enhance the electronic conductivity, and offer a robust scaffold during electrochemical processes. Compared to the bare ZnO and ZnO/rGO, the obtained ZnO/rGO/C composite can exhibit a high reversible capacity (~ 830 mA h g−1 after 100 cycles, approximately 85% of theoretical capacity), and superior rate capability as anodes for Li-ion battery. Additionally, the electrochemical property of ZnO-based materials for Na-ion batteries is also proposed for the first time. It demonstrates that the as-synthesized ZnO/rGO/C composite also delivers an outperformance cyclic stability and considerable reversible capacity (~ 300 mA h g−1 after 100 cycles). This simple methodology can be further extended to other energy storage applications.
This work was financially supported by Science Foundation of Xi’an University of Technology in China No. 101-451117007 and Natural Science Foundation of China (NSFC No. 51707153).
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