LAUSR

A N-doped hierarchical porous carbon nanostructure (NHPCN) was created on a carbon cloth (CC), through a templating process using self-assembled mesoporous silica spheres as the template, to fabricate high-performance flexible gel-type symmetric supercapacitors (NHPCN@CC//NHPCN@CC). The NHPCN@CC//NHPCN@CC cell exhibited outstanding capacitive performances, giving a decent energy density of 10.3 W h kg–1 at a high power density of 10 kW kg–1 and reaching a high energy density of 24.3 W h kg–1 at a power density of 0.5 kW kg–1, outperforming most carbon-based gel-type, symmetric supercapacitors. This success may be attributed to the continuous hollow, thin features of the NHPCN, with the hollow structure enabling local, fast adsorption/desorption of electrolyte ions for generation of electric double-layer capacitances and the thin carbon shells offering large amounts of exposed surface areas for accommodation of electric double-layer capacitances and pseudo-capacitances. The NHPCN@CC//NHPCN@CC cell exhibite...