▎ 摘　　要

Graphene is considered as a promising electrode material for supercapacitors due to its large specific surface area, excellent electrical conductivity and so on. In this paper, few-layer graphene is prepared by self-propagating combustion reaction between CO and metal magnesium, using powder MgO as deposition template. Graphene with a high specific surface area of up to 928 m(2) g(-1) replicates the morphological feature of powder MgO. Raman spectroscopy analysis demonstrates that the graphene layer decreases when the dosage of MgO template is increased. The specific capacitance of as-prepared sample exhibits the highest specific capacitance of 222 F g(-1) at the current density of 1 A g(-1) in EMI [TFSI] electrolyte. The sample demonstrates a "double high " performance with high specific energy density and high specific power density. A high energy density of 76.3 Wh kg(-1) can be achieved at a specific power density of 1.75 kW kg(-1), and it can still remain 48.6 Wh kg(-1) when the specific power density reaches a high level of 35 kW kg(-1). (C) 2022 Published by Elsevier B.V.