Graphene Hydrogels Implanted onto Carbon Cloth for\nPolypyrrole Electrodeposition toward High-Performance Supercapacitor\nElectrodes

Abstract

The\nclose integration of an active layer with a current collector\nis of significance for the properties of supercapacitor electrodes.\nHerein, we propose a novel and feasible strategy where graphene hydrogels\nare implanted onto the carbon cloth on which polypyrrole is electrodeposited\nto obtain specially constructed electrodes. Particularly, the graphene\noxide colloid drop-coated on the current collector undergoes a mild\nhydrothermal reduction to form a graphene hydrogel film implanted\nonto the carbon cloth. The integrated graphene/carbon cloth film with\na porous graphene framework effectively contributes to the polypyrrole\nloading and endows the as-prepared electrode with enhanced electrochemical\nproperties. The optimized electrode presents superb specific capacitances\n(522.3 F g^–1 at 0.7 A g^–1, 1462.5\nmF cm^–2 at 2 mA cm^–2), with satisfactory\nrate capability, cycling lifetime, and bending performance. The corresponding\ndevice can achieve a desirable energy density (88.67 μWh cm^–2, 15.8 Wh kg^–1) and power density\n(14.65 mW cm^–2, 2.64 kW kg^–1).\nThe design method reported in this paper could provide a new pathway\ntoward constructing high-performing electrodes based on graphene materials.