| 초록 |
Hollow and porous materials in proper nanoarchitectures have attracted much attention in energy storage and conversion applications. Here, we have fabricated hollow carbon nanofibers (HCNF) sheet by coaxial electrospinning of polyacrylonitrile/poly (methyl methacrylate) polymers solution followed by carbonization. Thereafter, metal-organic framework (MOF)-derived highly porous and conductive one dimensional cobalt oxide/carbon nanostructures have been developed on HCNF in 3D architecture (Co3O4-C/HCNF) by self-templated MOF-based method. As-developed material exhibits high porosity, a large specific surface area, abundant active sites and conductive graphitic carbon network. Therefore, as-developed free-standing material exhibits a specific capacity of 205 mA h g-1 at a current density of 1 A g-1. The asymmetric supercapacitor device assembled with nitrogen-doped graphene supplies an energy density of 39.3 W h kg-1 at power density of 471 W kg-1. |
