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Research Article | Open Access

Zwitterion-dissociated polyoxometalate electrolytes for solid-state supercapacitors

Dongming Cheng§Zhixin Gao§Wenwen WangSiqi LiBo LiHong-Ying Zang ( )
Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education at Universities of Jilin Province, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China

Dongming Cheng and Zhixin Gao contributed equally to this work.

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Abstract

Releasing cations from highly negatively charged polyoxometalates (POMs) is never an easy task. Herein, by using a zwitterion (1-sulfopropyl-3-methylimidazolium salt, MIMPS) to dissociate POMs, the proton conductivity of POM electrolytes was enhanced and the capacitive performance of solid-state supercapacitors (SCs) based on polyaniline was further improved. MIMPS can promote the dissolution and dissociation of POMs in polymer solutions, releasing more mobile protons, which is conducive to rapid proton transport. The MIMPS-modified SCs have higher capacitive performance, with an areal capacitance of 13 F·cm−2 at a current density of 0.5 mA·cm−2, compared to SCs without MIMPS (6.4 F·cm−2). In addition, the MIMPS-modified SCs have lower interfacial impedance, indicating that MIMPS can improve the proton conductivity and interfacial conduction. This work provides a new strategy for improving the overall performance of SCs by optimizing POM-based electrolytes with a zwitterion.

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Polyoxometalates
Article number: 9140019
Cite this article:
Cheng D, Gao Z, Wang W, et al. Zwitterion-dissociated polyoxometalate electrolytes for solid-state supercapacitors. Polyoxometalates, 2023, 2(1): 9140019. https://doi.org/10.26599/POM.2023.9140019

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Received: 20 September 2022
Revised: 19 November 2022
Accepted: 01 December 2022
Published: 02 February 2023
© The Author(s) 2023. Polyoxometalates published by Tsinghua University Press.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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