Preparation of hierarchical porous graphene nanosheets with high specific surface area and their electrochemical behaviors in supercapacitors

• Hierarchical porous graphene nanosheets prepared using PS spheres as template.
• The specific surface area for hierarchical porous graphene nanosheets up to 1942 m2/g.
• The treating temperature affecting the SSA and the electrochemical behavior of HPGNs.

Hierarchical porous graphene nanosheets (HPGNs) with high specific surface area have been prepared via a template method in which polystyrene microspheres was used as hard template. The as-prepared HPGNs showed a specific surface area as high as 1942 m2 g−1, considerably larger than those of porous graphene using polystyrene spheres as template reported before. The treating temperature of HPGNs is found to play an important role in determining their specific surface area and electrochemical performance. The HPGNs prepared at 700 °C showed an excellent rate performance, which could deliver a specific capacitance of as high as 112 Fg-1 even at 16 Ag-1 based on two-electrode system.

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