Fluidized-bed CVD of unstacked double-layer templated graphene and its application in supercapacitors

Graphene is inclined to stack with each other that greatly hinders the full utilization of its intrinsic extraordinary properties. Introducing protuberant spacers is a straightforward strategy to avoid the stacking of graphene nanosheets, resulting in a novel unstacked double-layer templated graphene (DTG) structure. Herein, a family of layered double hydroxides were used for the bulk chemical vapor deposition (CVD) of DTG in a fluidized-bed reactor. A high specific surface area of 1554.2 m² g^-1 and a large pore volume of 1.70 cm³ g^-1 were achieved. When used as the electrode material for supercapacitors, the DTG afforded a specific capacitance of 65.5 F g^-1 at a sweep rate of 5.0 mV s^-1 and a capacitance retention of 77% when the sweep rate was increased to 500 mV s^-1. Therefore, the DTG obtained via fluidized bed CVD is a promising electrode material for supercapacitor applications.