title: Cellulose nanofibril/reduced graphene oxide/carbon nanotube hybrid aerogels for highly flexible and all-solid-state supercapacitors.
abstract: A novel type of highly flexible and all-solid-state supercapacitor that uses cellulose nanofibril (CNF)/reduced graphene oxide (RGO)/carbon nanotube (CNT) hybrid aerogels as electrodes and H2SO4/poly(vinyl alcohol) (PVA) gel as the electrolyte was developed and is reported here. These flexible solid-state supercapacitors were fabricated without any binders, current collectors, or electroactive additives. Because of the porous structure of the CNF/RGO/CNT aerogel electrodes and the excellent electrolyte absorption properties of the CNFs present in the aerogel electrodes, the resulting flexible supercapacitors exhibited a high specific capacitance (i.e., 252 F g(-1) at a discharge current density of 0.5 A g(-1)) and a remarkable cycle stability (i.e., more than 99.5% of the capacitance was retained after 1000 charge-discharge cycles at a current density of 1 A g(-1)). Furthermore, the supercapacitors also showed extremely high areal capacitance, areal power density, and energy density (i.e., 216 mF cm(-2), 9.5 mW cm(-2), and 28.4 μWh cm(-2), respectively). In light of its excellent electrical performance, low cost, ease of large-scale manufacturing, and environmental friendliness, the CNF/RGO/CNT aerogel electrodes may have a promising application in the development of flexible energy-storage devices.
authors.affiliation: Department of Biomedical Engineering, Material Science Program, and Wisconsin Institute for Discovery, University of Wisconsin-Madison , Madison, Wisconsin 53715, United States.
authors.forename: Qifeng
authors.initials: Q
authors.lastname: Zheng
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Cai
authors.forename: Zhenqiang
authors.initials: Z
authors.lastname: Ma
authors.forename: Shaoqin
authors.initials: S
authors.lastname: Gong
keywords: aerogels; all-solid-state supercapacitors; carbon nanotube; cellulose nanofibrils; graphene