Ning and coworkers [101] reported a template CVD approach to produce nano- mesh graphene with a high surface area and well-controlled structure (Figure 5.6). By using porous MgO layers with polygonal shapes as a template, the nanomesh graphene could be produced to have only one or two graphene layers, the polygonal morphologies similar to the porous MgO layers, and its pore size is around 10 nm. Furthermore, the porous nanomesh graphene has a large SSA up to 1654 m2/g and total pore volume up to 2.35 cm3/g. As result, the specific capacitance of 255 F/g obtained at 10 mV/s in 6 M KOH aqueous electrolyte, significantly, the capacitance loss was only 21% with a scan rate variation from 10 to 500 mV/s. Furthermore, the nanomesh graphene electrode showed an excellent long cycle life with 94.1% specific capacitance retained after 2000 cycles. This synthesis approach opens opportunities for the mass production of porous graphene at low cost and is useful for applications that need graphene as a bulk material.