Electrochemical Reaction Gibbs Energy: Spontaneity in Electrochemical Cells

• Autores: Tomasz Pacześniak, Katarzyna Rydel-Ciszek, Paweł Chmielarz, Maria Charczuk, Andrzej Sobkowiak
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 95, Nº 10, 2018, págs. 1794-1800
• Idioma: inglés
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• Resumen

  • Spontaneity criteria for processes with useful (especially electrical) work have been discussed based on total differentials of thermodynamic functions. Reaction Gibbs energy (ΔrG) and electrochemical reaction Gibbs energy (ΔrG̃) have been juxtaposed. Three-dimensional graphs showing the dependencies of ΔrG̃ on the extent of reaction (ξ) and the cell voltage (φR – φL), in connection with their sections, enable both coherent and intuitive discussion of equilibrium in electrochemical systems. It was clearly indicated that important, commonly known dependencies can be justified and illustrated using these graphs.