Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

摘要

A scalable production of high surface area nanoporous carbon material (~ 2994 m2 g-1) withgood distribution of micro-, meso- and macro-pores was hydrothermally synthesized using bothcheap polymers and graphene foam as carbon sources. The as synthesised material shows aunique interconnected porous graphitic structure. The electrochemical double-layer capacitorfabricated from this nanoporous carbon material exhibited a superior supercapacitiveperformance of 188 F g-1 at current density 0.5 A g-1. This corresponded to areal capacitance of6.3 μF cm-2 coupled with a high energy of 0.56 μWh cm-2 (16.71 Wh kg-1) and a power density of13.39 μW cm-2 (401 W kg-1) due to extended potential window of 1.6 V in KOH aqueouselectrolyte. Moreover, no capacitance loss after 10,000 cycles was observed, owing to the unique structure and large surface area of the active material. The outstanding performance ofthis material as supercapacitor electrode shows that it has great potential for high performanceenergy-related applications.