Journal
ELECTROCHIMICA ACTA
Volume 287, Issue -, Pages 149-157Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.04.212
Keywords
Aerogel; Graphene; Asymmetric supercapacitor; Organic electrolytes
Categories
Funding
- National Natural Science Foundation of China
- Guangdong Province [U1401246]
- Science and Technology Program of Guangdong Province of China [2017B050504004]
- Science and Technology Program of Guangzhou City of China [201802020005, 2016201604030040]
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A novel rGO/V2O5 hybrid aerogel composite made up of vanadium pentoxide nanospheres embedded in graphene sheets was synthesized by an easy hydrothermal method. V2O5 with a loading of only 12 wt% in composite played a significant pseudocapacitance role. To obtain better material, an annealing process in a tube furnace was used. The final rGO/V2O5 electrode showed excellent electrochemical performance, achieving a specific capacitance of 384 F g(-1) at 0.1 A g(-1) and of 197 F g(-1) at 2 A g(-1). The rGO/V2O5 functioned as the anode and graphene functioned as the cathode in an asymmetric supercapacitor used in an organic electrolyte resulted in a wide potential operating window of 2.5 V and delivered a maximum energy density of 80.4Wh kg(-1) (275Wkg(-1)) at 0.2 A g(-1). In addition, the device possessed acceptable cyclic stability, with only 17.8% loss after 10000 cycles at 2 A g(-1). All of these outstanding properties could make the electrode material prepared in this study a promising application material for supercapacitors. (c) 2018 Elsevier Ltd. All rights reserved.
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