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Flexible Double-cross-linked Cellulose-based Hydrogel and Aerogel Membrane for Supercapacitor Separator

Abstract

A cellulose-based flexible double-cross-linked hydrogel with hierarchical porosity of max.80% was obtained by a facile solution-phase method of using polydopamine (PDA) as crosslinker between cellulose and polyacrylamide (PAM). The investigation on the ratio of the dopamine/acrylamide (DA/AM) reveals that the π-π stacking of the catechol groups in PDA and the abundant hydrogen bonds distributed in the gel network exert key effects on the hydrogels’ mechanical. At the premium ratio of 0.4 (C4-DM-40), the mechanical and self-healing properties of the hydrogel are superior to all those of other hydrogels. Fe3+-functionalizing endows the hydrogel an enhanced conductivity and sensitivity, evidenced by the triple increase of the resistance variation (∆R/R0) in finger-bending monitoring test. An electric double layer supercapacitor using the KOH-saturated C4-DM-40 aerogel membrane as a polymer electrolyte presents a high capacitance of 172 F g-1 at 1.0 A g-1, and long cycling life of 10000 cycles with 84.7% capacitance retention, attributing to the electrolyte retention of 548.6%. Remarkably, an integrated micro-supercapacitor is fabricated by directly depositing the activated carbon materials on the C4-DM-40 hydrogel membrane. The device shows an areal capacitance of 275.8 mF cm-2 and volumetric capacitance of 394.1 F cm-3 at 10 mV s-1. These findings suggest that the multi-functional cellulose-based hydrogels studied in this work displays various potentials in the practical applications not only in human health monitoring but also in the designation of portable and energy storage devices.

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Publication details

The article was received on 10 Aug 2018, accepted on 06 Nov 2018 and first published on 06 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA07751G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Flexible Double-cross-linked Cellulose-based Hydrogel and Aerogel Membrane for Supercapacitor Separator

    L. Li, F. Lu, C. Wang, F. Zhang, W. Liang, S. Kuga, Z. Dong, Y. Zhao, Y. Huang and M. Wu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07751G

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