Abstract
A flexible asymmetric supercapacitor (ASC) is successfully developed by using the composite of MoO(3) and graphene oxide (GO) electrochemically deposited on carbon cloth (CC) (MoO(3)/rGO/CC) as the cathode, the MnO(2) deposited on CC (MnO(2)/CC) as the anode, and Na(2)SO(4)/polyvinyl alcohol (PVA) as the gel electrolyte. The results show that the introduction of the GO layer can remarkably increase the specific capacitance of MoO(3) from 282.7 F g(-1) to 341.0 F g(-1). Furthermore, the combination of such good electrode materials and a neutral gel electrolyte renders the fabrication of high-performance ASC with a large operating potential difference of 1.6 V in a 0.5 mol L(-1) Na(2)SO(4) solution of water. Furthermore, the ASCs exhibit excellent cycle ability and the capacitance can maintain 87% of its initial value after 6000 cycles. The fact that a light-emitting diode can be lit up by the ASCs indicates the device's potential applications as an energy storage device. The encouraging results demonstrate a promising application of the composite of MoO(3) and GO in energy storage devices.