Hydrogen bonding-reinforced hydrogel electrolyte for flexible, robust, and all-in-one supercapacitor with excellent low-temperature tolerance
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Date
2020
Authors
Yu, H.
Rouelle, N.
Qiu, A.
Oh, J.A.
Kempaiah, D.M.
Whittle, J.D.
Aakyiir, M.
Xing, W.
Ma, J.
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Journal article
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ACS applied materials & interfaces, 2020; 12(34):37977-37985
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Abstract
Flexible super capacitors are promising energy storage devices for emerging wearable electronics. However, due to the poor mechanical strength, complicated device manufacturing process, and unsatisfactory low-temperature tolerance, their overall performance for practical applications is hindered. Herein, we report a hydrogen bonding reinforced,dual-crosslinked poly(vinyl alcohol), acrylic acid, and H2SO4 (PVA-AA-S)hydrogel electrolyte for all-in-one flexible supercapacitors. The PVA-AA-S hydrogeldemonstrates excellent compressive/tensile properties and high ionic conductivity. Ittolerates compressive stress of 0.53 MPa and is stretchable up to 500%. The hydrogel-basedall-in-one supercapacitor shows promising electrochemical performance under various harshconditions. The device energy density and power density reach up to 14.2 μWh cm−2 and0.94 mW cm−2, respectively. Furthermore, it retains nearly 80% capacitance after beingstored at −35 °C for 23 days. The excellent performance of the hydrogel electrolyteoriginates from its abundant strong hydrogen bonding between polymer chains and watermolecules.
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Data source: Supporting information, https://doi.org/10.1021/acsami.0c05454
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Copyright 2020 American Chemical Society
Access Condition Notes: Accepted manuscript available after 1 October 2021