FLEXIBLE HIERARCHICAL POROUS CARBON ELECTRODES FOR HIGH-PERFORMANCE SUPERCAPACITORS

摘要

Flexible energy storage devices, which are portable, lightweight, bendable and even wearable, have recently attracted extensive attention because of their wide potential applications in next generation electronics such as roll-up displays, smart mobile devices, wearable electronics, and implantable bio-sensors, etc [1]. Graphene, a typical two-dimensional nanomaterial, with large theoretical surface area, excellent mechanical property and good electrical conductivity, is widely researched as a flexible supercapacitor electrode material. Hierarchical porous structure with balanced micropores, mesopores and macropores is considered to be ideal structure for carbon electrodes of supercapacitors, which is beneficial for both high capacitance and good rate capability [2]. In this study, we propose a facial method to fabricate flexible, high surface area, hierarchical porous electrodes for supercapacitors by self-assembling the graphene nanosheets and powdery hierarchical porous carbon. The binder-free electrode possesses high surface area, highly developed hierarchical porous structure, and excellent flexibility, resulting in high capacitance and excellent rate capability.