Abstract
IrOx+RhOx mixed oxide layers on a Ti support were prepared by thermal decomposition at 450 C over the whole composition range. The temperature range 450–600 C was explored for the composition 30 mol% RhOx. Samples were characterized by means of SEM, XPS, cyclic voltammetry and polarization curves. Their electrocatalytic properties were tested for the H2 evolution reaction. The following experimental parameters were scrutinized: voltammetric charge, Tafel slope, reaction order (H + ), electrical resistance of electrocatalysts. The electrocatalytic properties were evaluated at constant potential as a function of temperature as well as of composition. The electrode stability was assessed by comparing CV curves before and after groups of experiments. A reaction mechanism has been proposed. RhOx is more active than IrOx, its effect showing up for compositions >30 mol%.
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