Abstract
This article reports on the influence of resorcinol (RC) on the kinetics of underpotential deposition of hydrogen (UPD of H) and the oxygen evolution reaction (OER), studied on a polycrystalline Pt electrode in a 0.5 M sulphuric acid supporting solution. It is well known that both PEM fuel cells and water electrolysers’ electrodes often contain significant amounts of nanostructured Pt or other types of noble metal particles. These materials provide the superior catalytic activity of electrochemical reactions such as OER (oxygen evolution reaction), HER (hydrogen evolution reaction) and ORR (oxygen reduction reaction). The trace amounts of phenolic substances contained in air or water could be harmful (when in contact with a fuel cell/water electrolyser’s working environment) to the abovementioned catalytic surfaces. Hence, they could potentially have severe detrimental effects on the kinetics of these processes. The results obtained in this work provided evidence for the detrimental role of Pt surface-adsorbed resorcinol molecules (or their electrodegradation products) on the kinetics of UPD of H and the oxygen evolution reaction. The above was revealed through evaluation of the associated charge-transfer resistance and capacitance parameters, comparatively derived on a platinum electrode, for the initial and the resorcinol-modified H2SO4 electrolyte.
Highlights
Hydrogen and oxygen-based reactions on metal-based electrodes are some of the most important electrochemical processes as proton-exchange membrane (PEM) fuel-cell and water electrolysis technologies continue their expansion [1,2,3,4,5,6]
Numerous works published in the contemporary literature have shown that resorcinol molecules under suitable catalytic conditions are prone to undergoing a sequence of potential-dependent surface-adsorption and electrodegradation steps [10,11,12]
CpH and parameter values significantly decreased to reach techniques to study the influence of resorcinol
Summary
Hydrogen and oxygen-based reactions on metal-based electrodes are some of the most important electrochemical processes as proton-exchange membrane (PEM) fuel-cell and water electrolysis technologies continue their expansion [1,2,3,4,5,6]. Numerous works published in the contemporary literature have shown that resorcinol molecules (similar to other phenols) under suitable catalytic conditions are prone to undergoing a sequence of potential-dependent surface-adsorption and electrodegradation steps [10,11,12]. The latter is of special importance for some noble and semi-noble metals, which, due to their superior hydrogen and oxygen evolution characteristics, are frequently used to make electrodes for water electrolysers
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