Application of Porous Carbon-based 3D Network in Supercapacitors

• 1、Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083

Abstract：Novel 3D porous carbon networks with high specific surface area was prepared using relatively low-cost commercial cotton as carbon source.The effect of activation ratio on the microstructure, pore size distribution, specific surface area and electrochemical properties of cotton derived carbon was studied. When the cotton/activation agent is 1:2, the specific area is 986.7 m2 g-1, and has the proper pore size distribution for ionic transportation, and also high conductivities and high electrochemical properties. When fabricated as electrode material, this material displays excellent electrochemical performance of 314 and 170 F g-1 at current density of 0.1 and 10 A g-1 in 6 mol L-1 KOH electrolyte respectively. After 10000 cycles at 3 A g-1, the capacity retention was 98%. Further, the material shows superior performance in polyvinyl alcohol (PVA)/KOH gel electrolyte: the highest capacity was 160 F g-1 and capacity almost has no loss after charging/discharging for 10000 cycles.

Keywords： material physics and chemistr supercapacitors cotton porous carbon