Rational Design of Graphene-Based Aerogels for High-Performance Supercapacitors
Herein, we have demonstrated a novel, simple, low-cost and green approach to produce graphene-based aerogels via the self-assembly of graphene oxide sheets in the alcohols. The as-prepared aerogles have shown special internal structures formed by self-assemble graphene sheets, whereby both macro- and mesopores for ionic transport have been achieved. In order to improve the electrochemical performance of the graphene aerogels, we have introduced ordered porous carbon (PC) with high specific capacity as an effective spacer to rationally design GN/PC aerogels . The ordered porous carbon (PC) with high specific surface area and good capacitance was introduced as a spacer to efficiently inhibit the restacking of graphene (GN) sheets, which has significantly enhanced the specific surface area and facilitated the transmission of ions and electrons in the as-synthesized porous hybrid structure. The all-state-solid electrode fabricated by the as-prepared GN/PC aerogels presented excellent flexibility, and exhibited high specific capacity and good rate performance in polyvinyl acetate/KOH gel electrolyte. Implication of the specific capacities of ~187 F g-1 at 1 A g-1 and 140 F g-1 at 10 A g-1 suggests that the GN/PC aerogels promised great potentials in the development of lightweight high-performance flexible energy storage devices.
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