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Fabrication of poly(vinyl alcohol)-polyaniline nanofiber/graphene hydrogel for high-performance coin cell supercapacitor

Title
Fabrication of poly(vinyl alcohol)-polyaniline nanofiber/graphene hydrogel for high-performance coin cell supercapacitor
Authors
Joo, HyeonseoHan, HoseongCho, Sunghun
DGIST Authors
Joo, Hyeonseo; Han, Hoseong; Cho, Sunghun
Issue Date
2020-04
Citation
Polymers, 12(4), 928
Type
Article
Article Type
Article
Author Keywords
supercapacitorcompositeconductive polymerpolyanilinenanofiberhydrogelmultilayer graphene
Keywords
POLYANILINEGRAPHENECOMPOSITES
ISSN
2073-4360
Abstract
Electroactive polymer hydrogel offers several advantages for electrical devices, including straightforward synthesis, high conductivity, excellent redox behavior, structural robustness, and outstanding mechanical properties. Here, we report an efficient strategy for generating polyvinyl alcohol-polyaniline-multilayer graphene hydrogels (PVA-PANI-MLGHDGs)with excellent scalability and significantly improved mechanical, electrical, and electrochemical properties; the hydrogels were then utilized in coin cell supercapacitors. Production can proceed through the simple formation of boronate (-O-B-O-) bonds between PANI and PVA chains; strong intermolecular interactions between MLG, PANI, and PVA chains contribute to stronger and more rigid HDGs. We identified the optimal amount of PVA (5 wt.%) that produces a nanofiber-like PVA-PANI HDG with better charge transport properties than PANI HDGs produced by earlier approaches. The PVA-PANI-MLG HDG demonstrated superior tensile strength (8.10 MPa) and higher specific capacitance (498.9 F/cm2, 166.3 F/cm3, and 304.0 F/g) than PVA-PANI HDGs without MLG. The remarkable reliability of the PVA-PANI-MLG HDG was demonstrated by 92.6% retention after 3000 cycles of galvanostatic charge-discharge. The advantages of this HDG mean that a coin cell supercapacitor assembled using it is a promising energy storage device for mobile and miniaturized electronics. © 2020 by the authors.
URI
http://hdl.handle.net/20.500.11750/12056
DOI
10.3390/POLYM12040928
Publisher
MDPI AG
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