Multi-level electrolyte regulation toward a stable Zn anode in aqueous zinc-ion capacitors

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors

Date

2025-12-15

Department

Department of Bioproducts and Biosystems
Department of Chemistry and Materials Science

Major/Subject

Mcode

Degree programme

Language

en

Pages

10

Series

Chemical Engineering Journal, Volume 526

Abstract

The aqueous zinc (Zn)-based energy storage system (AZESS) offers low cost and high safety, making it a promising candidate for energy storage devices. However, its practical application is hindered by dendritic growth and side reactions at the anode side. To overcome these challenges, a multi-level modulation strategy is proposed based on a multi-component hydrogel electrolyte to precisely regulate the Zn2+ solvation structure, hydrogen-bond (H-bond) network, and deposition behavior. This tailored electrolyte suppresses interfacial water aggregation, mitigates water-induced side reactions, and enables uniform Zn deposition/dissolution, thereby effectively inhibiting dendrite growth and enhancing interfacial stability. As a result, the Zn//Zn symmetric cell using this hydrogel demonstrates remarkable durability, along with a high coulombic efficiency. Moreover, the assembled Zn//Activated carbon (AC) capacitor exhibits outstanding long-term performance, maintaining an impressive capacity retention of 99.55 % and high coulombic efficiency (CE) of 99.8 % after 35,000 cycles. This strategy provides a promising pathway for the rational design of advanced electrolytes toward high-performance Zinc-ion capacitors (ZICs).

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Publisher Copyright: © 2025 The Authors

Keywords

Dendrite-free Zn anode, Electrolyte regulation, Hydrogel electrolyte, Zn-ion capacitors

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DOI

10.1016/j.cej.2025.171236

Citation

Liu, C, Kong, X, Kallio, T & Kontturi, E 2025, 'Multi-level electrolyte regulation toward a stable Zn anode in aqueous zinc-ion capacitors', Chemical Engineering Journal, vol. 526, 171236. https://doi.org/10.1016/j.cej.2025.171236

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https://urn.fi/URN:NBN:fi:aalto-202601091126

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[article-cris] Kemian tekniikan korkeakoulu / CHEM