Plastic Three-dimensional Nanocarbon-Polyacrylic Acid Sponges with High Volumetric Capacitance for Li-ion Capacitor
Three-dimensional reduced graphene oxide(rGO)based hydrogel or sponges have received increasing attention in recent years.High porosity combined with mechanical durability in graphene based sponges is in high demand in energy storage field.However,pure rGO sponges are generally delicate and fragile,which is hard to handle and process.Moreover,low package density of graphene based material leads to low volumetric energy density,which limits its further commercial application,although it has already achieved high gravimetric energy storage in supercapacitor.Herein,we came up with a method to improve the volumetric capacity by simply pressing fluffy rGO sponge into dense film.Self-assembly of rGO and polymer-assisted cross-linking are cooperated to fabricate the rGO based hydrogel with higher plastic property.Poly acrylic acid(PAA)could enhance the mechanical integrity of the rGO sponges,thus could be pressed into freestanding integral film.In this case,addition of carbon nanotube(CNT)could enhance the conductivity and prevent the sharp decline of surface area by pi-pi interaction between CNT and rGO sheets preventing the restacking problem.Unlike the rGO sponges which cannot be pressed,the compressed rGO-CNT-PAA film still maintains intensive porous structure with the trace of squeezing in microstructure and achieves gravimetric and volumetric capacity of 140 mAh g–1 and 73 mAh cm–3.
Graphene Supercapacitor Three-dimensional electrode Hydrogel Volumetric performance
Lin Yunhui Fang Ruopian Boyer Cyrille Zhu Shenmin Li Feng Wang DaWei
Particle and Catalysis Group,School of Chemical Engineering,University of New South Wales,UNSW,Sydne Advanced Carbon Division,Shenyang National Laboratory for Materials Science,Institute of Metal Resea Centre for Advanced Molecular Design,School of Chemical Engineering,University of New South Wales,UN State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai
国际会议
北京
英文
2103-2112
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）