Abstract
This work presents ac. impedance spectroscopy and cyclic voltammetry electrochemical examinations on the influence of surface-adsorbed resorcinol (RC) or its oxidation/reduction derivatives on the kinetics of underpotential deposition of hydrogen (UPD of H), cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) processes, examined at polycrystalline Pt electrode in 0.1 M NaOH supporting electrolyte. The recorded data provided evidence on the beneficial role of Pt-electrosorbed resorcinol molecules on the kinetics of UPD of H. On the other hand, the effect of surface-adsorbed RC species (or its electro-oxidation intermediates) on the OER's kinetics was purely detrimental, whereas the resorcinol effect on the cathodic HER was hardly discernible. The above was all elucidated through evaluation of the ac. Impedance-associated parameters and cyclic voltammetry profiles recorded for RC-free and resorcinol-modified NaOH electrolytes.
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