Abstract
Hydrogen evolution reaction (HER) was studied over a rough rotating disk palladium electrode in 0.1M sulfuric acid using steady-state polarization current measurements and electrochemical impedance spectroscopy (EIS). Among all the applied potentials, up to −0.074V, two semicircles were found on the complex plane plots, which were attributed to the HER. Surface roughness factor, Rf=23, was determined from the double-layer capacitance. The Tafel slope was −0.097Vdec−1 and the value of the intrinsic exchange current density was 0.22mAcm−2. The double layer capacitance, charge transfer resistance, adsorption resistance, and pseudocapacitance as functions of potential were also determined from the EIS results. The HER proceeds through the Volmer-Heyrovsky mechanism.
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