期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 33, 页码 4111-4122出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201203771
关键词
graphene quantum dots; MnO2; micro-supercapacitors; asymmetric supercapacitors; rate capability
类别
资金
- Chinese Academy of Sciences
- National Nature Science Foundations of China [51005225]
- Youth Science Foundations of Gansu Province [1107RJYA274]
Graphene quantum dots (GQDs) have attracted tremendous research interest due to the unique properties associated with both graphene and quantum dots. Here, a new application of GQDs as ideal electrode materials for supercapacitors is reported. To this end, a GQDs//GQDs symmetric micro-supercapacitor is prepared using a simple electro-deposition approach, and its electrochemical properties in aqueous electrolyte and ionic liquid electrolyte are systematically investigated. The results show that the as-made GQDs micro-supercapacitor has superior rate capability up to 1000 V s(-1), excellent power response with very short relaxation time constant ((0) = 103.6 s in aqueous electrolyte and (0) = 53.8 s in ionic liquid electrolyte), and excellent cycle stability. Additionally, another GQDs//MnO2 asymmetric supercapacitor is also built using MnO2 nanoneedles as the positive electrode and GQDs as the negative electrode in aqueous electrolyte. Its specific capacitance and energy density are both two times higher than those of GQDs//GQDs symmetric micro-supercapacitor in the same electrolyte. The results presented here may pave the way for a new promising application of GQDs in micropower suppliers and microenergy storage devices.
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