Standard states and standard adsorption gibbs energy of substances at electrode interfaces |
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| Institution: | 1. Deggendorf Institute of Technology, Edlmairstr. 6+8, 94469 Deggendorf, Germany;2. Universitat Autònoma de Barcelona (UAB), 08193 Bellaterra (Barcelona), Spain;1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, PO Box 11155-4563, Tehran, Iran;2. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, Tehran, Iran |
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| Abstract: | The physical meaning of ΔG°ad is discussed in terms of choice of standard states, form of the isotherm equation, true adsorption equilibrium reaction and contributions from interactions in the solution bulk. It is shown that the quantitative value of ΔG°ad may be misleading if the above factors are not taken into account properly. The particular case of thiourea adsorption on Hg is discussed in detail. It is recommended that surface and bulk concentrations are expressed as mole fractions whenever possible so as to minimize problems of ΔG°ad interconversion among different isotherms. |
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