Abstract
Herein, a conducting copolymer hydrogel of poly(aniline-co-pyrrole)/polyvinyl alcohol (PACP/PVA) was prepared by in-situ polymerization of aniline and pyrrole in aqueous solution of phytic acid and PVA. This PACP/PVA hydrogel can be used directly as self-standing electrode for supercapacitors. The hydrogel electrode delivers high electrochemical capacitance (633.5 F g−1 at 0.5 A g−1, 1267 mF cm−2 at 1 mA cm−2) and excellent cycling stability (86.4% capacitance retention after 10,000 cycles). In particular, the remarkable flexibility of the PACP/PVA hydrogel electrode is demonstrated by 81.7% of initial capacitance retention after repeated bending 500 cycles. Based on PACP/PVA hydrogel electrode and a typical PVA/H2SO4 hydrogel electrolyte, an all-hydrogel-state supercapacitor was assembled. The supercapacitor demonstrates high areal capacitance of 317 mF cm−2 at 1 mA cm−2 and energy density of 44 µWh cm−2 (22 Wh kg−1) at 250 µW cm−2 (125 W kg−1). This work provides a new direction for fabricating self-standing flexible hydrogel electrode materials for smart and wearable devices.
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Acknowledgements
This research was supported by the Fundamental Research Funds for the Central Universities (Grant 2019XKQYMS03).
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XYT was involved in funding acquisition, writing-original draft, writing-review & editing, project administration. YW contributed to investigation, validation. WBM was involved in methodology. SFY contributed to writing-review & editing. KHZ was involved in data curation. LTG contributed to conceptualization. HLF was involved in software. ZSL contributed to formal analysis. YBZ was involved in supervision. XYW contributed to resources.
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Tao, XY., Wang, Y., Ma, Wb. et al. Copolymer hydrogel as self-standing electrode for high performance all-hydrogel-state supercapacitor. J Mater Sci 56, 16028–16043 (2021). https://doi.org/10.1007/s10853-021-06304-3
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DOI: https://doi.org/10.1007/s10853-021-06304-3