模板-物理活化法制备高性能中孔炭材料

研究了硅溶胶模板法制备的作为超级电容器电极材料中孔炭的孔结构和电化学性能.中孔炭的平均孔径和比电容随硅溶胶/炭源(葡萄糖)比的增加而增大.提出了一种硅溶胶模板法与CO2物理活化法相结合的模板-物理活化法以提高中孔炭的BET表面积来提高中孔炭的比电容.采用恒流充放电和电化学阻抗谱研究了中孔炭的孔结构与倍率性能的关系,并与商品化微孔活性炭作了比较.结果表明平均孔径较大的中孔炭具有较好的倍率特性.模板-物理活化法制备的中孔炭具有高比电容和良好的倍率特性.

High performance mesoporous carbon material prepared by template-physical activation method

The pore structure and electrochemical properties of mesoporous carbons prepared by silica sol template method as electrode material for supercapacitor were investigated. The mean pore size and mass specific capacitance of the mesoporous carbons increased with the increase of silica sol/carbon source (glucose) ratio. A modified template method, combining silica sol template method and CO2 physical activation method, was proposed to improve the mass specific capacitance of the mesoporous carbon with improved BET surface area. The correlation of rate capability and pore structure of mesoporous carbon was studied by constant current discharge and electrochemical impedance spectroscopy. A commercial available microporous carbon was used for comparison. The result shows that mesoporous carbon with larger pore size delivers good rate capability. Mesoporous carbon synthesized by modified template method has both high mass specific capacitance and good rate capability.