Electrochemical Fundamentals | Thermodynamics of Electrode Reactions
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Author / Producer
Date
2025
Publication Type
Encyclopedia Entry
ETH Bibliography
yes
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Abstract
This chapter provides a concise exploration of thermodynamic principles governing electrochemical cells, focusing on Galvanic and electrolysis cells. Galvanic Cells showcase spontaneous oxidation-reduction reactions, exemplified by Fuel Cells, while electrolysis cells require energy to drive non-spontaneous redox processes like water electrolysis. Electrochemical potentials, equilibrium potentials, and the role of the Galvani potential in electrochemical equilibrium are discussed. The Nernst equation illustrates concentration dependence and temperature dependence is examined through approximations, revealing changes in equilibrium cell potential. The concept of the electrical double layer is introduced, featuring models like Helmholtz, Gouy-Chapman, and Stern, elucidating charge distribution and capacitance at electrode-electrolyte interfaces.
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Publication status
published
Editor
Book title
Encyclopedia of Electrochemical Power Sources (Second Edition)
Journal / series
Volume
1
Pages / Article No.
76 - 84
Publisher
Elsevier
Event
Edition / version
2nd ed.
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Software
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Date collected
Date created
Subject
Electrical double layer; Electrochemical potential; Electrolysis cell; Galvani potential; Galvanic cell; Nernst equation
Organisational unit
03910 - Schmidt, Thomas J. / Schmidt, Thomas J.