Xylan derived carbon sphere/graphene composite film with low resistance for supercapacitor electrode  

作　　者：Jihai Cai Yujin Li Rongji Qin Guangsheng Li Xiaoying Wang 

机构地区：[1]State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China [2]School of Food Science and Engineering,Ocean University of China,Qingdao 266100,China [3]Shandong Yinuokang Pharmaceutical Co.,Ltd,Dongying 257000,China

出　　处：《Collagen and Leather》2024年第3期93-106,共14页胶原与皮革(英文)

基　　金：financially supported by National Natural Science Foundation of China(No.22208114);Science and Technology Planning Project of Guangzhou City(No.202201010178);China Postdoctoral Science foundation(2022M721195);Leading Talents in the Yellow River Delta Industry

摘　　要：Reduced graphene oxide(rGO)films suffer from low capacitance for inner unreduced oxygen functional groups,restacking of sheets and high contact resistance.Herein,carbon spheres derived from renewable xylan were added to graphene oxide with large sheet area to fabricate film by gelation and filtration,followed by in situ reduction for high-performance flexible supercapacitor.rGO film with transverse size about 13 pm showed a good specific capacitance of 967 mF/cm^(2) at a scanning rate of 5 mV/sand increased to 1786 mF/cm^(2) by in situ reducing its inner part,which generally remained oxidized due to outer hindering from hydrophobic graphene.Then,by hydrothermal carbonization of xylan and activation with KOH,activated carbon sphere(aXCS)was prepared,which had a diameter of 150-200 nm and a specific capacitance of 270 F/g.The aXCS acted as spacer and connector to avoid restacking of graphene sheets and decrease interlayer contact resistance,resulting 94%increase in capacitance performance from rGO film to aXCS/rGO film.Therefore,combined in situ reduction and enhancement through compositing aXCS,the final film(aXCS/rGO-AA)showed a boosted specific capacitance of 755 mF/cm^(2) at 1 mA/cm^(2) in double electrode system,power density of 22.5-2250 mW/cm^(2),and energy density of 11.88-25.2 mWh/cm^(2).Meanwhile,aXCS/rGO-AA had outstanding cycling stability that its specific capacitance maintained 108.7%after 10,000 cycles of charge-dis-charge,showing promising potential in wearable and portable electronics.

关 键 词：XYLAN Carbon sphere Graphene film In situ reduction SUPERCAPACITOR 

分 类 号：TB3[一般工业技术—材料科学与工程]