Abstract
? 2022Graphene 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 m2 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.
NSTL
Elsevier