文献类型：期刊文献

英文题名：Study on the relation between pore size and supercapacitance in mesoporous carbon electrodes with silica-supported carbon nanomembranes

作者：Zhi, Jian[1];Wang, Youfu[1];Deng, Sheng[1];Hu, Aiguo[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2014

卷号：4

期号：76

起止页码：40296

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20143900070779);WOS:【SCI-EXPANDED(收录号:WOS:000341936400022)】；

基金：The support of National Natural Science Foundation of China (91023008), Ph.D. Programs Foundation of Ministry of Education of China (20100074110002), the Fundamental Research Funds for the Central Universities, and Shanghai Leading Academic Discipline Project (B502) is gratefully acknowledged. AH thanks the "Eastern Scholar Professorship" support from Shanghai local government and Prof. Baohang Han for providing valuable comments.

语种：英文

外文关键词：Mesoporous materials - Electric discharges - Capacitance - Silica - Electrodes - Carbon - Nanostructures - Secondary batteries

摘要：Electrochemical capacitors (ECs) have traditionally been considered as standing at the opposite end against batteries in energy-power diagram. They charge and discharge faster than batteries but are limited by much lower energy density. By optimizing the pore structure of porous electrode materials, the performance of ECs could overcome this limitation. However to date, no study has addressed the complex relationship between the texture parameters of the electrode materials and the supercapacitance of ECs. Using silica-supported carbon nanomembranes, four electrode materials with similar pore geometry are generated. The electrodes with a pore size of 4.14 nm shows the highest capacitance of 305 F g(-1) in aqueous electrolytes. A new model is developed to simulate the accommodation of the solvated ions at the electrode surface. The simulation reveals that the optimal capacitance of ECs can be achieved using porous carbon electrode materials with open pores of 3.0-5.0 nm.