Coulometric Study of Ethanol Adsorption at a Polycrystalline Platinum Electrode

Report No. ARL-TR-5594
Authors: Sol Gilman
Date/Pages: July 2011; 28 pages
Abstract: For dilute solutions of ethanol in 1N solution of perchloric acid (HClO4), rates of adsorption and saturation surface coverages were determined by measuring the charge corresponding to blockage of hydrogen adsorption sites under well-controlled conditions of surface cleanliness/activity and mass transport. In a dilute solution of ethanol, oxidative adsorption rates maximize at 0.3 V, dropping off at more cathodic potentials due to competition with adsorbed hydrogen and dropping off at more anodic potentials due to oxidative processes that produce products released to the electrolyte. The time and concentration dependence of adsorption follows relationships that are common for adsorption on a heterogeneous surface. Some evidence is presented supporting a mechanism for production of soluble products that does not involve the adsorbed species that are detected through the measurement of blockage of hydrogen adsorption sites.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 2011