Superior Characteristics of Hierarchical Porous Carbon in Supercapacitor
1.Introduction Various carbonaceous materials, including activated carbon1 carbon aerogels2, carbon nanotubest3, microporons skeleton carbon4 and mesoporous carbon (hard-templated)5, have been investigated as electrode materials of supercapacitor. Among those carbons, common active carbon possesses limited surface area and mainly mieropores, which lead to low energy density and power output; carbon aerogel and carbon nanotubes has provided a good model system with large mesopores and high conductivity, leading to impressive power densities but low energy density due to their low surface area; Mieroporons skeleton carbon is prepared by chlorinating carbides using chlorine gas at high temperatures, whose preparation process is quite hazardous. Hard-templated mesoporous carbons provide reasonably good combination of energy density and power density due to their large surface area and relatively large pore size. However, the insufficient and unadjustable mieropores and long pathway of ionic diffusion in small mesopore channel (2-4 nm) hinders the further improvement of energy density and power density of these materials. Therefore, a carbon with more and tunable micropores, larger mesopores and appropriate micropore-mesopore architecture is expected to be a superior electrode material to hard-templated mesoporons carbon for EDLC applications.
Hierarchical porous carbon Capacitance Power density Frequency
Xiuli Gao Congcong Huang Wei Xing Shuping Zhuo
School of Chemical Engineering,Shandong University of Technology,Zibo 255049,China
国际会议
江苏镇江
英文
261-263
2008-10-15（万方平台首次上网日期，不代表论文的发表时间）