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Electrolyte Concentration-Driven Structural and Electrochemical Modulation of Copper Hexacyanoferrate in Zinc-Ion Batteries

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Abstract:

This study investigates the effect of electrolyte concentration on the crystal structure and electrochemical performance of copper hexacyanoferrate (CuHCF) as an electrode material for aqueous zinc-ion batteries. CuHCF electrodes were tested in ZnCl2 electrolytes with concentrations ranging from 1.0 to 10.0 mol dm⁻3. Electrochemical analyses—including linear sweep voltammetry and galvanostatic cycling—revealed a strong dependence of capacity and cycling stability on electrolyte concentration. The 1.0 M electrolyte exhibited superior initial capacity, whereas the 10.0 M electrolyte demonstrated enhanced capacity retention during prolonged cycling. X-ray diffraction showed that higher concentrations suppressed Zn-ion substitution in the CuHCF lattice, thereby improving structural stability. These findings suggest that careful tuning of electrolyte concentration is critical for balancing initial performance and long-term durability in CuHCF-based zinc-ion batteries.

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Periodical:

Solid State Phenomena (Volume 394)

Pages:

39-45

DOI:

https://doi.org/10.4028/p-qlbXQ3

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Online since:

June 2026

Authors:

Sangyup Lee, Paul Maldonado Nogales, Seunga Yang, Soon Ki Jeong*

Keywords:

Aqueous Electrolyte, Crystal Structure, Electrolyte Concentration, Zinc-Ion Battery

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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