Journal
JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS
Volume 46, Issue 1, Pages 91-108Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/jnet-2020-0070
Keywords
redox flow batteries; open-circuit voltage; non-equilibrium thermodynamics; Zn-air battery
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Funding
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant [765289]
- Czech Science Foundation [20-22092S]
- Charles University Research program [UNCE/SCI/023]
- European Regional Development Fund-Project Organic redox couple based batteries for energetics of traditional and renewable resources (ORGBAT) [CZ.02.1.01/0.0/0.0/16_025/0007445]
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The Nernst equation, originally derived by Walther Nernst more than a century ago, is a cornerstone in the analysis of electrochemical systems. However, the assumptions behind its derivation are often overlooked in the literature, leading to incorrect forms of the equation when applied to complex systems. Proper thermodynamic derivation is important, especially in modeling vanadium redox flow batteries or zinc-air batteries.
Originally derived by Walther Nernst more than a century ago, the Nernst equation for the opencircuit voltage is a cornerstone in the analysis of electrochemical systems. Unfortunately, the assumptions behind its derivation are often overlooked in the literature, leading to incorrect forms of the equation when applied to complex systems (for example, those with ion-exchange membranes or involving mixed potentials). Such flaws can be avoided by applying a correct thermodynamic derivation independently of the form in which the electrochemical reactions are written. The proper derivation of the Nernst equation becomes important, for instance, in modeling of vanadium redox flow batteries or zinc-air batteries. The rigorous path towards the Nernst equation derivation starts in non-equilibrium thermodynamics.
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