Graphene Hydrogels Implanted onto Carbon Cloth for Polypyrrole Electrodeposition toward High-Performance Supercapacitor Electrodes

The close integration of an active layer with a current collector is of significance for the properties of supercapacitor electrodes. Herein, we propose a novel and feasible strategy where graphene hydrogels are implanted onto the carbon cloth on which polypyrrole is electrodeposited to obtain specially constructed electrodes. Particularly, the graphene oxide colloid drop-coated on the current collector undergoes a mild hydrothermal reduction to form a graphene hydrogel film implanted onto the carbon cloth. The integrated graphene/carbon cloth film with a porous graphene framework effectively contributes to the polypyrrole loading and endows the as-prepared electrode with enhanced electrochemical properties. The optimized electrode presents superb specific capacitances (522.3 F g(-1) at 0.7 A g(-1), 1462.5 mF cm(-2) at 2 mA cm(-2)), with satisfactory rate capability, cycling lifetime, and bending performance. The corresponding device can achieve a desirable energy density (88.67 mu Wh cm(-2), 15.8 Wh kg(-1)) and power density (14.65 mW cm(-2), 2.64 kW kg(-1)). The design method reported in this paper could provide a new pathway toward constructing high-performing electrodes based on graphene materials.