Jump to main content
Jump to site search


A metal-free and flexible supercapacitor based on redox-active lignin functionalized graphene hydrogel

Abstract

The emerging flexible supercapacitor has motivated tremendous research interest in portable energy device. However, challenges still exist in the pursuit of cheap and renewable electrode materials. Herein, a metal-free and flexible supercapacitor was fabricated based on lignin functionalized graphene hydrogel (LS-GH). The supercapacitor shows comparable or even higher performance than those of reported transition metal based pseudocapacitive supercapacitors, which can be attributed to the reversible redox charge transfer of quinone groups in lignin. It presents an impressive specific capacitance of 432 F g-1 in aqueous electrolyte, which is nearly 2 times higher than that of pure graphene hydrogel (238 F g-1). Moreover, the device exhibits high rate capability (81.0% capacitance retention at 20 A g-1) and cycling stability (90.0% capacitance retention over 10000 cycles). The resulting LS-GH electrodes are further fabricated into a flexible solid-state supercapacitor using H2SO4-polyvinyl alcohol (PVA) gel as electrolyte. The integrated flexible device not only maintains high capacitive performances (408 F g-1 at 1 A g-1, 75.4% capacitance retention at 20 A g-1 and 84.0% capacitance retention over 10000 cycles), but also exhibits excellent mechanical flexibility. This work paves the way to develop flexible energy devices based on metal-free, renewable and low-cost biomass resources.

Back to tab navigation

Supplementary files

Publication details

The article was received on 03 May 2017, accepted on 10 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03789A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    A metal-free and flexible supercapacitor based on redox-active lignin functionalized graphene hydrogel

    F. Li, X. Wang and R. Sun, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03789A

Search articles by author

Spotlight

Advertisements