Abstract
The ethylene glycol (EG) electrooxidation reaction was studied in alkaline media using three distinct platinum catalysts, named Pt(110), Pt(111) and Pt(poly) (or polycrystalline). While the reaction showed potential oscillations under current control when catalyzed by both Pt(poly) and Pt(111), no oscillations were observed employing Pt(110) once different amounts of adsorbed EG intermediates take place on the surfaces. Galvanostatic time-series (GTS) depicted a faster drift, i.e. amplitude, period and oscillation shape changes over time, on Pt(111) than in Pt(poly) for several EG concentrations and electrolyte temperatures, this behavior being explained by means of the maximum potential reached in each oscillation cycle and distinct mechanisms that trigger non-reversible processes on these surfaces.
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