Copolymer hydrogel as self-standing electrode for high performance all-hydrogel-state supercapacitor

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 h...

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Bibliographic Details
Published in:Journal of materials science 2021-10, Vol.56 (28), p.16028-16043
Main Authors: Tao, Xue-Yu, Wang, Yao, Ma, Wen-bin, Ye, Shi-Fang, Zhu, Ke-Hu, Guo, Li-Tong, Fan, He-Liang, Liu, Zhang-Sheng, Zhu, Ya-Bo, Wei, Xian-Yong
Format: Article
Language:English
Subjects:
Aniline
Aqueous solutions
Capacitance
Capacitors
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Conducting polymers
Copolymers
Crystallography and Scattering Methods
Electrode materials
Electrodes
Electrolytes
Energy Materials
Flux density
Hydrogels
Materials Science
Phosphates
Phytic acid
Polymer Sciences
Polymerization
Polyvinyl alcohol
Solid Mechanics
Sulfuric acid
Supercapacitors
Wearable technology
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Summary: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/H 2 SO 4 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. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-021-06304-3