Construction of hierarchical porous graphene-carbon nanotubes hybrid with high surface area for high performance supercapacitor applications

摘要

Unlike activated carbon, graphene sheets are lack of ion pathways on their basal planes and prone to agglomerate or restack unfortunately for their strong pi - pi interactions between neighboring sheets. All of which will pose significant obstacles for its application in high performance supercapacitors. Herein, we report a simple and fast strategy for the scalable synthesis of hierarchical honeycomb-like porous graphene-carbon nanotubes hybrid (PGCTs) through a simple laser induced self-propagating reaction process and subsequent activation with low amount of KOH without any template. Benefiting from properly integration of large surface area, hierarchical pore structures, in-plane nanopores and CNTs nanospacers, the as-obtained PGCTs based symmetrical supercapacitor exhibits outstanding electrochemical performance with super capacitance, excellent rate capability, and desirable cyclability.