Environmentally Benign Natural Hydrogel Electrolyte Enables a Wide Operating Potential Window for Energy Storage Devices

Funding Sponsor

American University in Cairo

Author's Department

Energy Materials Laboratory

Second Author's Department

Energy Materials Laboratory

Third Author's Department

Energy Materials Laboratory

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https://doi.org/10.1021/acssuschemeng.3c06265

All Authors

Heba M. El Sharkawy, Abdelrahman A.M. Ismail, Nageh K. Allam

Document Type

Research Article

Publication Title

ACS Sustainable Chemistry and Engineering

Publication Date

3-4-2024

doi

10.1021/acssuschemeng.3c06265

Abstract

The development of energy-efficient storage platforms is of paramount importance. Specifically, wearable, smart, flexible, and portable electronic devices with small size, lightweight, and high safety are of urgent need for several applications. To achieve these criteria, green, sustainable, nonflammable, and biodegradable hydrogel electrolytes are essential. To this end, we developed a LiCl@starch-based hydrogel via readily gelatinization of starch. The ionic conductivity of the synthesized gel was tuned via controlled variation of the LiCl content, as revealed by the electrochemical impedance spectroscopy (EIS) measurements. The developed starch gel network with 2 M LiCl showed ultrahigh ionic conductivity of 0.079 S·cm-1 with excellent thermal stability and nonflammability. The rheological characteristics are aligned with enhanced ionic conductivity. Using the commercially available activated carbon (AC), the assembled supercapacitor symmetric device (AC//2-LiCl@starch//AC) withstands a wide operating voltage window of 2.4 V with outstanding specific capacitance (62.3 F/g), energy density, and reliable self-discharge time. These findings imply that this quasi-solid biopolymer gel can be a viable electrolyte for various energy storage devices.

First Page

3517

Last Page

3526

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Article. Record derived from SCOPUS.

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