用于超级电容器电极材料的CNCs/PVA/RGO/PPy复合气凝胶

CNCs/PVA/RGO/PPy Composite Aerogel for Electrode Materials of Supercapacitors

本研究以聚乙烯醇(PVA)与纤维素纳米晶(CNCs)共混形成网络结构,并引入了氧化石墨烯(GO)和聚吡咯(PPy),通过原位聚合法将PPy均匀沉积在复合材料表面,并以冻融循环法和冷冻干燥法制备复合气凝胶,最终用还原剂将复合材料中的GO还原为还原氧化石墨烯(RGO),制备了导电性良好的CNCs/PVA/RGO/PPy复合气凝胶。通过结构及电化学性能表征分析,表明该复合气凝胶有着良好的多孔网状结构以及优异的电化学性能(在电流密度为0.25mA/cm2时,比电容量约为352F/g),该复合气凝胶在超级电容器电极材料领域具有很好的应用前景。

In this study,polyvinyl alcohol(PVA)and cellulose nanocrystals(CNCs)were blended to form a network structure,and graphene oxide(GO)and polypyrrole(PPy)were introduced.Py was uniformly deposited on the surface of the composites by in-situ polymerization and composite aerogels were prepared by freeze-thaw cycle and freeze drying method.The Go in the composite was reduced to reduced graphene oxide(RGO)with reducing agent,and the CNCs/PVA/RGO/PPy composite aerogel with good electrical conductivity was prepared.Through the characterization and analysis of structure and electrochemical performance,the results showed that the composite aerogel has good porous network structure and excellent electrochemical performance(the specific capacity was about 352 F/g when the current density was 0.25 mA/cm2).The composite has a good application prospect in the field of electrode materials.