A Novel Polyaniline Nanowire Arrays/Three-Dimensional Graphene Composite for Supercapacitor

摘要

It is an effective way to obtain high performance super-capacitors by increasing the surface area and conductivity of electrode materials. In this paper, three-dimensional (3D) graphene with a small pore size, good electrical conductivity and high mechanical strength is fabricated by chemical vapor deposition using nickel nanoparticles as the template. Then, a polyaniline nanowire arrays (PANI NWAs)/3D graphene compo-site is fabricated by in-situ polymerization. Due to the high conductivity and unique nano-structure, the as-prepared PANI NWAs/3D graphene composite exhibits an excellent capaci-tance of 680 Fg~(-1) at current density of 1 Ag~(-1) . Moreover, a symmetric supercapacitor based on the PANI NWAs/3D graphene composite is assembled, and it shows an energy density of 6.43 Whkg~(-1) at a power density of 0.4 kWkg~(-1). The assembled supercapacitor also exhibits a good cycling stability, which retains 78% of its initial specific capacitance after 1000 cycles.