University of Oulu

J. Mater. Chem. C, 2020,8, 550-560

A stretchable and compressible ion gel based on a deep eutectic solvent applied as a strain sensor and electrolyte for supercapacitors

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Author: Hong, Shu1,2; Yuan, Yang1; Liu, Chaozheng1;
Organizations: 1College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, China
2Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2 MB)
Persistent link:
Language: English
Published: Royal Society of Chemistry, 2020
Publish Date: 2022-02-16


An ion gel based on a deep eutectic solvent (DES) was fabricated using free radical polymerization of an acrylamide monomer in a choline chloride–urea–glycerol (ChCl–U–G) system. The mechanical properties of the ion gel were reinforced by dispersing cellulose pulp in the DES without losing its conductivity. The obtained ion gel was flexible and strong, and it acted like an elastomer. Its excellent mechanical properties can be ascribed to the formation of a coherent hydrogen bond network between the DES and the polymer matrix. The ion gel was successfully applied as a sensor to monitor the grasping motion of the hand, which provides a new approach for designing green electronics (e.g., for electronic skin). The ion gel was also applied as a solid-state electrolyte in a symmetric supercapacitor with a wide operating voltage window of 2 V and a high specific capacitance of 161.8 F g⁻¹ at a current density of 0.2 A g⁻¹. It also exhibited a high energy density of 22.47 W h kg⁻¹ at a power density of 0.11 kW kg⁻¹ and outstanding cyclability (95.3% capacitance retention after 2000 cycles at 1.0 A g⁻¹). Moreover, the main components of the prepared multifunctional ion gel are biocompatible, cost-effective, and environmentally friendly, offering a new route for the fabrication of green and adaptable structures for electronics.

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Series: Journal of materials chemistry. C, Materials with applications in optical, magnetic & electronic devices
ISSN: 2050-7526
ISSN-E: 2050-7534
ISSN-L: 2050-7526
Volume: 8
Issue: 2
Pages: 550 - 560
DOI: 10.1039/C9TC05913J
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
215 Chemical engineering
220 Industrial biotechnology
Funding: This research was supported by grants from the National Natural Science Foundation of China (31370567), the Doctorate Fellowship Foundation of Nanjing Forestry University, the National First-Class Disciplines, the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Academy of Finland project “Bionanochemicals” (298295).
Academy of Finland Grant Number: 298295
Detailed Information: 298295 (Academy of Finland Funding decision)
Copyright information: © The Royal Society of Chemistry 2020. The Definitive Version of Record can be found online at: