Adsorption of Benzoic Acid on Gold in Perchlorate Solutions
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概要
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The adsorption of benzoic acid from solutions of 10<SUP>−2</SUP> to 10<SUP>−5</SUP> M on gold electrode surface in perchlorate solutions of pH 1–4 was studied from differential capacity data obtained by a single pulse method. Strong adsorption is observed in the more acidic solutions. This points to predominant adsorption of benzoic acid molecule, rather than benzoate anions, possibly due to the π-electron interaction. At pH 1, benzoic acid replaces four water molecules. This interprets the flat adsorption of benzoic acid molecule on the gold electrode and the π-electron interaction with free electron of the metal surface. The standard free energy of adsorption <I>Δ</I>\bar<I>G</I><SUP>°</SUP> is −10.4 kcal/mol.
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著者
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Schmid G.
Department of Chemistry, University of Florida
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Katoh Koichi
Department of Chemistry, University of Florida