Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1486866 | Materials Research Bulletin | 2016 | 8 Pages |
•Dandelion-like CuO wrapped by rGO nanosheets have been prepared.•The wrapping of rGO contributes to improve the electrochemical performance.•The CuO-rGO electrode exhibits a specific capacitance of 296 F g−1 at 1 A g−1.•The capacitive retention reaches 96.1% after 2000 cycles at 2 A g−1.
In this study, reduced graphene oxide (rGO)-wrapped dandelion-like CuO microspheres have been successfully synthesized using a one-step hydrothermal method without calcination. Characterization results demonstrate that dandelion-like CuO microspheres with sizes of 2.0 μm are well wrapped by ultrathin rGO nanosheets. Moreover, the introduced amount of GO dispersion in the reaction system was found to play a key role in tuning the phase compositions and microstructures of the resultant CuO-rGO composites. When used as electrode materials for supercapacitors, dandelion-like CuO wrapped by rGO nanosheets exhibited the best capacitive behavior with a specific capacitance of 296 F g−1 at 1.0 A g−1 and a retention of 96.1% after 2000 cycles at 2.0 A g−1. Such excellent electrochemical performance might be mainly attributed to the rGO wrapping effect, efficiently providing higher electronic conductivity and buffering the volume changes.
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