Journal
CARBOHYDRATE POLYMERS
Volume 195, Issue -, Pages 593-600Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.04.078
Keywords
Pectin; Cations; Graphene hydrogel; Flexible electrode; High-performance
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Funding
- National Natural Science Foundation of China [51572028]
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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 pectincations. 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.
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