Supercapacitor Performances of Coal Tar Pitch Based Spherical Active Carbons Fabricated by the SiO <sub>2</sub> Template Method
Baoqing Mo, Luyao Wang, Lixiang Li, Beibei Han, Guiying Xu, Kun Wang, Jian Zhang, Zhenyong Ni, Xu He, Weimin Zhou
Abstract
In accordance with the suspension method, the coal tar pitch-based SiO2/C composite sphere precursors are successfully synthesized by using the coal tar pitches as carbon resources and a template agent of SiO2. After sequentially carrying out the processes of carbonizations, acid pickling and activations, the coal tar pitch-based spherical active carbons are successfully fabricated, and their supercapacitor characteristics are investigated in detail. The storage type of the fabricated active carbons mainly manifests the obvious double-layer capacitor behaviors. The specific capacitance of fabricated spherical active carbons is 153.5 F g−1 at 0.5 A g−1. Furthermore, after cycling 10,000 times, the specific capacitance of obtained spherical active carbons still remains 151.19 F g−1 at 1 A g−1. Considering the fact that the coal tar pitches are the general industrial raw materials, the functional coal tar pitch-based spherical active carbons exhibit a significantly applicable perspective in the field of fabrications of super-capacitors.