A cellulose-based hybrid 2D material aerogel for a flexible all-solid-state supercapacitor with high specific capacitance

Yanyan Lv, Lei Li, Yi Zhou, Miao Yu, Jianquan Wang, Jianxin Liu, Jiagui Zhou, Zongqing Fan, Ziqiang Shao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

As one of the energy storage devices, all-solid-state flexible supercapacitors have attracted significant attention because of their high power density, low cost, high safety, low environmental impact, and long cycle life. In this study, a new type of all-solid-state flexible supercapacitor that uses cellulose nanofibers (CNFs)/molybdenum disulfide (MoS2)/reduced graphene oxide (RGO) hybrid aerogel film as an electrode material and charge collector and H2SO4/polyvinyl alcohol (PVA) gel as an electrolyte and separator has been demonstrated. These aerogels are prepared by supercritical CO2 drying, which use CNFs as an effective, environmentally friendly, and steady dispersant of MoS2 and RGO. Owing to the porous structure of the electrodes and the remarkable electrolyte absorption properties, the supercapacitors exhibit excellent electrochemical properties. The specific capacitance calculated from the cyclic voltammogram curves at a scan rate of 2 mV s-1 is about 916.42 F g-1. The capacity retention is more than 98% after 5000 charge-discharge cycles at a current density of 0.5 mA cm-2. Additionally, the areal capacitance, areal power density, and energy density of the supercapacitors are about 458.2 mF cm-2, 8.56 mW cm-2 (4.3 kW kg-1), and 45.7 μW h cm-2 (22.8 W h kg-1), respectively. Owing to its low cost and environmental friendliness, CNFs/MoS2/RGO nanohybrid aerogel has great application potential as an electrode material of all-solid-state flexible supercapacitors.

Original languageEnglish
Pages (from-to)43512-43520
Number of pages9
JournalRSC Advances
Volume7
Issue number69
DOIs
Publication statusPublished - 2017

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