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Cation Co-intercalation in Potassium Copper(II) Hexacyanoferrates.

Antonio Doménech-Carbó1, Silvana López2, Bastián Chandía2

  • 1Departamento de Química Analítica, Universitat de València, Dr. Moliner, 50, 46100, Burjassot, València, Spain.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|February 3, 2023
PubMed
Summary

This study investigates the solid-state electrochemistry of potassium copper hexacyanoferrate, revealing cation-independent electron transfer and cation-dependent Fe(III) reduction. Diffusion coefficients for Na+ and K+ ions were determined.

Keywords:
copper hexacyanoferrateelectrochemistryion intercalationtheoretical modeling

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Area of Science:

  • Solid-state electrochemistry
  • Inorganic materials science
  • Electrochemical energy storage

Background:

  • Potassium copper hexacyanoferrate is a promising material for electrochemical applications.
  • Understanding cation insertion mechanisms is crucial for optimizing battery performance.
  • Previous studies have not fully elucidated the cation-dependent electrochemical behavior of this material.

Purpose of the Study:

  • To investigate the cation-insertion solid-state electrochemistry of potassium copper(II) hexacyanoferrate.
  • To determine the stoichiometry and electrochemical properties of the synthesized material.
  • To analyze the contributions of electronic and ionic processes to Gibbs energy changes during cation transfer.

Main Methods:

  • Voltammetry of immobilized particles methodology was employed for electrochemical studies.
  • Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) was used for material characterization.
  • Cyclic voltammetry, open circuit potential measurements, and chronoamperometry were utilized to analyze electrochemical behavior and ion diffusion.

Main Results:

  • The synthesized solid exhibited a stoichiometry of K$_{0.876}$Cu$^{II}$$_{1.328}$Fe$^{III}$$_{0.049}$[Fe$^{III}$$_{0.318}$Fe$^{II}$$_{0.682}$(CN)$_6$].
  • Cation-independent electron transfer Gibbs energy values were consistent across different electrolyte cations (K$^+$, Na$^+$).
  • Fe(III) reduction showed cation-dependent Nernstian behavior for Na$^+$ and K$^+$, with significant co-diffusion of Li$^+$ in Li$^+$ electrolytes. Diffusion coefficients for Na$^+$ and K$^+$ were estimated at ~10$^{-9}$ cm$^2$/s.

Conclusions:

  • The study provides a comprehensive understanding of the cation-insertion electrochemistry in potassium copper hexacyanoferrate.
  • The findings highlight the distinct ion diffusion mechanisms depending on the electrolyte cation, crucial for material design.
  • This research contributes to the development of advanced materials for electrochemical energy storage devices.