真空浸渍法制备生物质炭/石墨烯复合电极及其充放电性能研究  

Preparation of biochar/graphene composite electrode via vacuum impregnation and study on its charge-discharge property

作　　者：芮保珍 施鹰[1] 谢建军[1] 雷芳[1] 范灵聪[1] 章蕾[1] RUI Bao-zhen;SHI Ying;XIE Jian-jun;LEI Fang;FAN Ling-cong;ZHANG Lei(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院

出　　处：《现代化工》2019年第12期145-149,共5页Modern Chemical Industry

基　　金：上海市自然科学基金扬帆计划(16YF1404500)

摘　　要：生物质炭具有天然的分级多孔结构,是双电层电容器优良的电极材料,但是其电导率低限制了其应用。将具有良好导电性能的石墨烯与生物质炭做成复合材料,可提高超级电容器的性能。采用真空浸渍法将石墨烯负载到生物质炭的表面和孔隙中。石墨烯不仅提高了生物质炭的电导率,而且增加了比表面积。生物质炭/石墨烯复合电极在电流密度为0.5 A/g时,比电容大小为159.74 F/g,比未负载石墨烯的纯生物质炭电极提高了4倍多。充放电循环5000次,性能无衰减,呈现出良好的稳定性。Biochar with natural hierarchical porous structure is an ideal electrode material for double layer capacitor.But its low conductivity limits the application.To prepare high performance super capacitor,high conductive graphene is combined with biochar to form biochar/graphene composite material.In this study,graphene is deposited on the surface and into pores of biochar via vacuum impregnation method.The loaded graphene enhances the conductivity as well as the specific surface area of biochar.Biochar/graphene composite electrode exhibits a specific capacitance of 159.74 F·g-1 under a current density of 0.5 A·g-1,which is four times larger than that of pure biochar without graphene.The electrode still shows excellent stability without any damping after 5000 charge-discharge cycles.

关 键 词：生物质炭 石墨烯 超级电容器 电化学性能 

分 类 号：TQ31[化学工程—高聚物工业]