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A flexible asymmetric supercapacitor (ASC) is successfully developed by using the composite of MoO₃ and graphene oxide (GO) electrochemically deposited on carbon cloth (CC) (MoO₃/rGO/CC) as the cathode, the MnO₂ deposited on CC (MnO₂/CC) as the anode, and Na₂SO₄/polyvinyl alcohol (PVA) as the gel electrolyte. The results show that the introduction of the GO layer can remarkably increase the specific capacitance of MoO₃ 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 Na₂SO₄ 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 MoO₃ and GO in energy storage devices.