Abstract
This work presents a study of the catalytic oxidation of ethanol on polycrystalline gold electrode in alkaline media. The investigation was carried out by means of chronoamperometry, cyclic voltammetry, andin situ FTIR spectroscopy. The main goal was to investigate the early stages of ethanol electrooxidation, namely at fairly low potentials (E = 600 mV vs. RHE) and for moderate reaction times (t < 300 s). Chronoamperometric experiments show a current increase accompanying the increasing in the ethanol concentration up to about 2 M and then a slight decrease at 3 M. Adsorbed CO has been observed as early as about 200 mV vs. RHE and indicates that the cleavage of the C-C bond might occur, probably to a small extent, at very low overpotentials during ethanol adsorption on gold surface. The amount of dissolved acetate ions produced during the chronoamperomentry was followed by the asymmetric stretching band at 1558 cm−1 as a function of time, and found to increase linearly with time up to 300 s. This allowed estimating the reaction order of acetate formation with respect to ethanol concentration.
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Roberto Batista de Lima, graduated in Chemistry at the UFRN (2001), did his Master (2003) and PhD in Physical Chemistry at the IQSC — Universidade de Sao Paulo (2006), under the supervision of Prof. Dr. Teresa Iwasita. Then he was awarded a post-doc position in Prof. Varela's Group at the same institution. His scientific interests are electrocatalysis and spectroelectrochemical techniques.
Hamilton Varela graduated in Chemical Engineering at the UFRN (1998), did his Master in Physical Chemistry at the IQSC — Universidade de Sao Paulo (2002), his PhD in Chemistry at the Fritz-Haber-Institut of the Max Planck Society under the supervision of Prof. Dr. Katharina Krischer (2004), and a post-doc at the Physics Department — Technical University Munich. Since 2007 he is an assistant Professor at the IQSC — USP. His current interests are electrocatalysis and nonlinear dynamics of fuel cell relevant reactions and self-organization in reaction-transport systems.
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de Lima, R.B., Varela, H. Catalytic oxidation of ethanol on gold electrode in alkaline media. Gold Bull 41, 15–22 (2008). https://doi.org/10.1007/BF03215619
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DOI: https://doi.org/10.1007/BF03215619