Preparation And Electrochemical Performance Of NiO/Mesoporous Carbon Composite As Electrode Material For Supercapacitor

A series of ordered mesoporous carbons were used as carrier and NiO was supported on the carbons by microwave-oxidation and impregnation method. In order to achieve reasonable balance between structure and performance of material, NiO/C composite electrode material for supercapacitor with high specific capacitance and steady cycle capability was received.Microwave-oxidation method was firstly introduced to support NiO on CMK-3 synthesized by SBA-15 template for improving capacitance performance of mesoporous carbons and then contrasted to impregnation method. ICP test showed microwave-oxidation method had advantage of speediness, uniformity and high supporting efficiency. The specific capacitance was improved to 295.9 F/g, which was much more than 252.6 F/g attained by impregnation method.Ordered mesoporous carbon C-FDU-15 derived from the co-assembly of F127 and resol had been successfully synthesized by soft template method, and then NiO was supported on C-FDU-15 using microwave-oxidation method. XPS test proved that Ni2+ was transformed to mixture of Ni and Ni(OH)2 under microwave radiation, and then translated into NiO by air calcination. The effect of NiO content on structure and electrochemical performance of ordered mesoporous carbon was investigated. The specific capacitance of NiO/C reached to 407 F/g with an increase of 34.3 % under proper NiO content.We also tried to add nickel salt in the preparation process of C-FDU-15 and the nickel salt was translated to NiO after air calcination. Experiment results indicated that the specific capacitance of C-FDU-15 was increased from 307.4 F/g to 444.1 F/g and the steady cycle capability of charge-discharge was greatly improved when the NiO content was appropriate.Monodisperse ordered mesoporous carbon spheres were synthesized by non-calcined SiO2 spheres as template for predigesting the synthetical course. The effect of reactive temperature and silicate/surfactant concentration on the structure of carbon spheres was investigated. Ordered mesoporous carbon spheres could then be obtained with high specific surface area, uniform particle size and pore diameter of 2~4 nm. The specific capacitance and cycle capability were greatly improved after supporting quantitative NiO on carbon spheres by microwave-oxidation method.