Microwave-assisted conversion of biomass wastes to pseudocapacitive mesoporous carbon for high-performance supercapacitor  

作　　者：Xiangkun Bo Kun Xiang Yu Zhang Yu Shen Shanyong Chen Yongzheng Wang Mingjiang Xie Xuefeng Guo 

机构地区：[1]Key Lab of Mesoscopic Chemistry MOE,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,Jiangsu,China [2]Hubei Key Laboratory for Processing and Application of Catalytic Materials,Huanggang Normal University,Huanggang 438000,Hubei,China

出　　处：《Journal of Energy Chemistry》2019年第12期1-7,共7页能源化学（英文版）

基　　金：financially supported by the National Key Technology R&D Program of China(2017YFB0310704);the National Natural Science Foundation of China(21773112 and 21173119);the Fundamental Research Funds for the Central Universities

摘　　要：Developing an efficient approach of transforming biomass waste to functional carbon-based electrode materials applied in supercapacitor offers an important and high value-added practical application due to the abundance and considerable low price of biomass wastes.Herein,a hierarchical carbon functionalized with electrochemical-active oxygen-containing groups was fabricated by microwave treatment from the biomass waste of camellia oleifera.The obtained mesoporous carbon(MAC)owns nanosheet morphology,rich mesoporosity,large surface area(1726 m2/g)and very high oxygenic functionalities(16.2 wt%)with pseudocapacitive activity.Prepared electrode of supercapacitor and tested in 2.0 M H2 SO4,the MAC exhibits an obvious pseudocapacitive activity and achieved a superior supercapacitive performance to that of directly activated carbon(DAC-800)including high specific capacitance(367 F/g vs.298 F/g)and better rate performance(66%vs.44%).The symmetrical supercapacitor based on MAC shows a high capacity of275 F/g,large energy density of 9.55 Wh/kg(at power density of 478 W/kg)and excellent cycling stability with 99%capacitance retention after 10000 continuous charge-discharge,endowing the obtained MAC a promising functional material for electrochemical energy storage.Developing an efficient approach of transforming biomass waste to functional carbon-based electrode materials applied in supercapacitor offers an important and high value-added practical application due to the abundance and considerable low price of biomass wastes. Herein, a hierarchical carbon functionalized with electrochemical-active oxygen-containing groups was fabricated by microwave treatment from the biomass waste of camellia oleifera. The obtained mesoporous carbon(MAC) owns nanosheet morphology,rich mesoporosity, large surface area(1726 m2/g) and very high oxygenic functionalities(16.2 wt%) with pseudocapacitive activity. Prepared electrode of supercapacitor and tested in 2.0 M H2 SO4, the MAC exhibits an obvious pseudocapacitive activity and achieved a superior supercapacitive performance to that of directly activated carbon(DAC-800) including high specific capacitance(367 F/g vs. 298 F/g) and better rate performance(66% vs. 44%). The symmetrical supercapacitor based on MAC shows a high capacity of275 F/g, large energy density of 9.55 Wh/kg(at power density of 478 W/kg) and excellent cycling stability with 99% capacitance retention after 10000 continuous charge-discharge, endowing the obtained MAC a promising functional material for electrochemical energy storage.

关 键 词：Microwave conversion Mesoporous carbon Pseudocapacitive activity SUPERCAPACITOR 

分 类 号：O64[理学—物理化学]