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A Zn-Ce Redox Flow Battery with Ethaline Deep Eutectic Solvent.

Xiaozhou Cao1, Song Wang1, Xiangxin Xue1

  • 1School of Metallurgy, Northeastern University, Shenyang, 110819, P. R. China.

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Summary

Deep eutectic solvents (DES) offer a wider electrochemical window for redox flow batteries. A Ce/Zn battery using ethaliine electrolyte achieved 84% coulombic efficiency at 0.5 mA cm⁻².

Keywords:
ceriumdeep eutectic solventsenergy storageredox flow batterieszinc

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Deep eutectic solvents (DES) present advantages over traditional electrolytes for redox flow batteries, including wider electrochemical windows and lower costs.
  • The development of novel electrolytes is crucial for advancing the performance and economic viability of energy storage systems.

Purpose of the Study:

  • To investigate the feasibility of using a deep eutectic solvent (ethaliine) as an electrolyte for a cerium-zinc redox flow battery.
  • To evaluate the electrochemical performance of CeIV/CeIII and ZnII/Zn redox couples in ethaliine.

Main Methods:

  • A redox flow battery was assembled using choline chloride-ethylene glycol (ethaliine) as the deep eutectic solvent electrolyte.
  • Cerium (CeIV/CeIII) and zinc (ZnII/Zn) redox couples were employed as active materials.
  • Cyclic voltammetry was used to determine the potential difference, and charge-discharge tests were conducted at various current densities, temperatures, and cerium concentrations.

Main Results:

  • The CeIV/CeIII and ZnII/Zn redox couples exhibited a stable potential difference of 2.2 V (vs. Ag) in ethaliine.
  • Optimal battery performance, including a coulombic efficiency of 84%, was achieved at a current density of 0.5 mA cm⁻², room temperature, and 1.0 M CeIII concentration.

Conclusions:

  • Deep eutectic solvents, specifically ethaliine, are suitable electrolytes for cerium-zinc redox flow batteries.
  • The demonstrated performance indicates the potential of DES-based electrolytes for efficient and cost-effective energy storage applications.