Carbonized\nCellulose Nanofibril/Graphene Oxide Composite\nAerogels for High-Performance Supercapacitors

Abstract

The\nrapidly growing market of portable electronic devices has sparked\never-increased interests in the development of low-cost and sustainable\nsupercapacitor materials with a long cycling life, high specific capacity,\nand operation security. In this work, we fabricated an eco-friendly\nand highly scalable supercapacitor electrode material by fabricating\nthree-dimensional (3D) carbon-based aerogels using 2,2,6,6-tetramethylpiperidine-1-oxyl\nradical (TEMPO)-oxidized cellulose nanofibril (TOCN) and graphene\noxide (GO) as precursors via a facile ion-exchange method followed\nby freeze-drying. The obtained TOCN/GO aerogels were further carbonized\nin argon atmosphere to prepare the carbon nanofibril with improved\nconductivity and transform GO to reduced graphene oxide (RGO). The\nelectrochemical performance of the carbonized TOCN/RGO (CTRGO) aerogels\nis presented, achieving a high specific capacitance of 398.47 F/g\nat the current density of 0.5 A/g. Moreover, the initial capacity\nstill maintains 99.77% after 10000 charging/discharging cycles, revealing\nthe outstanding cycling stability. Therefore, the as-prepared carbon\nnanofibril/reduced graphene oxide aerogel is a promising prospect\nfor realizing large-scale applications.