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Science China Chemistry

, Volume 62, Issue 4, pp 515–520 | Cite as

Ion-vacancy coupled charge transfer model for ion transport in concentrated solutions

  • Yu Gao
  • Jun HuangEmail author
  • Yuwen Liu
  • Jawei Yan
  • Bingwei Mao
  • Shengli ChenEmail author
Articles
  • 27 Downloads

Abstract

We present a conceptual framework for understanding and formulating ion transport in concentrated solutions, which pictures the ion transport as an ion-vacancy coupled charge transfer reaction. A key element in this picture is that the transport of an ion from an occupied to unoccupied site involves a transition state which exerts double volume exclusion. An ab initio random walk model is proposed to describe this process. Subsequent coarse-graining results in a continuum formula as a function of chemical potentials of the constituents, which are further derived from a lattice-gas model. The subtlety here is that what has been taken to be the chemical potential of the ion in the past is actually that of the ion-vacancy couple. By aid of this new concept, the driving force of ion transport is essentially the chemical affinity of the ion-vacancy coupled charge transfer reaction, which is a useful concept to unify transport and reaction, two fundamental processes in electrochemistry. This phenomenological model is parameterized for a specific material by the aid of first-principles calculations. Moreover, its extension to multiple-component systems is discussed.

Keywords

concentrated solutions ion dynamics ion volume effect chemical affinity ion-vacancy couple 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (21673163, 21832004, 21802170). J. Huang appreciates financial support from Central South University (502045001, 20180020050002).

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Hubei Key Laboratory of Electrochemical Power Sources, Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of ChemistryWuhan UniversityWuhanChina
  2. 2.Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina
  3. 3.State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of ChemistryXiamen UniversityXiamenChina

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