Ultrafine MnO 2 nanowires grown on RGO-coated carbon cloth as a binder-free and flexible supercapacitor electrode with high performance.

Reduced graphene oxide coated carbon cloth has been used as a substrate for the growth of ultrafine MnO 2 nanowires (CC/RGO/MnO 2 ), forming binder-free and flexible supercapacitor electrode materials. The experimental results indicate that a maximum area-specific capacitance of 506.8 mF cm -2 was gained from the CC/RGO/MnO 2 electrode at the current density of 0.128 mA cm -2 . Furthermore, the electrode exhibits excellent cycling stability (98.6% specific capacitance was still retained after 10 000 galvanostatic charge-discharge (GCD) tests when the current density was 1.28 mA cm -2 ). What's more, the area-specific capacitance of the CC/RGO/MnO 2 electrode was hardly changed, when the electrode was operated under bending mechanical conditions. In addition, the charge storage performance and mechanism of the MnO 2 nanostructures was discussed.