Self-assembly of flexible graphene hydrogel electrode based on crosslinked pectin-cations

Lanshu Xu; Linlin Cui; Mengying Jia; Yue Li; Jianmin Gao; Xiaojuan Jin

doi:10.1016/j.carbpol.2018.04.078

Self-assembly of flexible graphene hydrogel electrode based on crosslinked pectin-cations

Carbohydr Polym. 2018 Sep 1:195:593-600. doi: 10.1016/j.carbpol.2018.04.078. Epub 2018 Apr 23.

Authors

Lanshu Xu¹, Linlin Cui¹, Mengying Jia¹, Yue Li¹, Jianmin Gao¹, Xiaojuan Jin²

Affiliations

¹ MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
² MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China. Electronic address: jxj0322@bjfu.edu.cn.

PMID: 29805016
DOI: 10.1016/j.carbpol.2018.04.078

Abstract

Pectin, natural polysaccharide biopolymer, was chelated with cations (Mg²⁺/Ca²⁺) to form an interwoven framework. Herein, the graphene hydrogel electrodes were self-assembled by the synergistic effects of pectin-cations. The optimum combination proportion was determined, the Mg²⁺/Ca²⁺-pectin matrix cross-linked graphene hydrogel (Mg²⁺/Ca²⁺-PGH) electrodes exhibited a large specific capacitance of about 839.2 F g^-1 with high coulombic efficiency of 191.8% at a current density of 1 A g^-1. The assembled flexible supercapacitor displayed excellent stability (capacitance retention of 98.5% after 2000 charge/discharge cycles) and flexibility (the specific capacitance remained 98.4% of its original value after 500 folding/unfolding cycles). Such flexible and high-performance Mg²⁺/Ca²⁺-PGH electrodes are attractive in the field of lightweight, miniature and wearable energy storage devices.

Keywords: Cations; Flexible electrode; Graphene hydrogel; High-performance; Pectin.