Folded three-dimensional graphene with uniformly distributed mesopores for high-performance supercapacitors

Folded three-dimensional graphene (FTG) is prepared through self-assembly of graphite oxide (GO) and liquid-phase exfoliation graphene (LG), followed by sonication and reduction processes. The obtained FTG consists of few-layer graphene. And it possesses a high degree of crystallinity, three-dimensional architecture and uniformly distributed mesopores. A supercapacitor based on an FTG electrode exhibits enhanced electrochemical performance. The FTG electrode exhibits high specific capacitance of 195.4 F g(-1) at a scan rate of 1 mV s(-1) and excellent cycling stability with 93.9% of its initial capacitance at a large scan rate of 500 mV s(-1) after 8000 cycles. The supercapacitor fabricated with the FTG electrode delivers a high energy density of 27.1 W h kg(-1) at a power density of 97.7 W kg(-1). These results suggest that FTG is a promising material for high-performance supercapacitor applications.