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Flexible Quasi‐Solid‐State High‐Performance Aqueous Zinc Ion Hybrid Supercapacitor with Water‐in‐Salt Hydrogel Electrolyte and N/P‐Dual Doped Graphene Hydrogel Electrodes

Flexible Quasi‐Solid‐State High‐Performance Aqueous Zinc Ion Hybrid Supercapacitor with... Aqueous zinc ion hybrid supercapacitors (ZHSCs) have attracted considerable attention owing to the bivalent nature, high abundance, and stability in the water‐based system of zinc. High energy density and superb power output can be achieved simultaneously by integrating a battery‐type electrode and a capacitive‐type electrode. However, there are still many issues that remain, including but not only hydrogen evolution reaction, dendrite growth, and dramatic capacity loss at low temperatures. Herein, a new type of hybrid “water‐in‐salt” hydrogel electrolyte based on 1 m Zn(CH3COO)2 and 20 m CH3COOK to expand the voltage window of ZHSCs to 0–2.1 V by suppressing the decomposition of water molecules is developed. The aqueous ZHSC delivers maximum energy of 100.2 Wh kg−1 at a power density of 487.5 W kg−1 based on the active materials and displays excellent cycling stability with 99.5% capacitance retention after 4000 cycles. Meanwhile, it is found that the assembled flexible quasi‐solid‐state ZHSC using the potassium polyacrylate/sodium carboxymethyl cellulose hydrogel electrolyte (containing 1 m Zn(CH3COO)2 and 20 m CH3COOK) also shows high‐performance (energy density of 106.5 Wh kg−1 at a power density of 383.3 W kg−1) with temperature adaptability at low temperature and wearable application potential with excellent energy storage performance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Sustainable Systems Wiley

Flexible Quasi‐Solid‐State High‐Performance Aqueous Zinc Ion Hybrid Supercapacitor with Water‐in‐Salt Hydrogel Electrolyte and N/P‐Dual Doped Graphene Hydrogel Electrodes

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Publisher
Wiley
Copyright
© 2021 Wiley‐VCH GmbH
eISSN
2366-7486
DOI
10.1002/adsu.202100191
Publisher site
See Article on Publisher Site

Abstract

Aqueous zinc ion hybrid supercapacitors (ZHSCs) have attracted considerable attention owing to the bivalent nature, high abundance, and stability in the water‐based system of zinc. High energy density and superb power output can be achieved simultaneously by integrating a battery‐type electrode and a capacitive‐type electrode. However, there are still many issues that remain, including but not only hydrogen evolution reaction, dendrite growth, and dramatic capacity loss at low temperatures. Herein, a new type of hybrid “water‐in‐salt” hydrogel electrolyte based on 1 m Zn(CH3COO)2 and 20 m CH3COOK to expand the voltage window of ZHSCs to 0–2.1 V by suppressing the decomposition of water molecules is developed. The aqueous ZHSC delivers maximum energy of 100.2 Wh kg−1 at a power density of 487.5 W kg−1 based on the active materials and displays excellent cycling stability with 99.5% capacitance retention after 4000 cycles. Meanwhile, it is found that the assembled flexible quasi‐solid‐state ZHSC using the potassium polyacrylate/sodium carboxymethyl cellulose hydrogel electrolyte (containing 1 m Zn(CH3COO)2 and 20 m CH3COOK) also shows high‐performance (energy density of 106.5 Wh kg−1 at a power density of 383.3 W kg−1) with temperature adaptability at low temperature and wearable application potential with excellent energy storage performance.

Journal

Advanced Sustainable SystemsWiley

Published: Oct 14, 2021

Keywords: hydrogel electrolyte; N/P co‐doped graphene; water‐in‐salt; zinc ion hybrid supercapacitor

References