Abstract
Periodic current/potential curves were measured potentiostatically on smooth electrodes of platinum, iridium, rhodium, and gold at 30 mV/s in perchloric acid solutions with different additions of methanol (10−3 M to 1 M). Information on methanol adsorption was obtained from impedance measurements at 1000 c/s by volcammetry with superimposed a.c. voltage. The current/potential curves look similar on Pt and Pd on the one hand, and on Ir and Rh on the other hand. There is no noticeable methanol oxidation on gold. The peak current of the first wave during the anodic sweep decreases considerably in the order Pt > Pd > Rh > Ir. The capacitive component of the impedance shows methanol adsorption in the hydrogen and double layer region. The shape of the current/potential curves and the methanol adsorption are strongly influenced on platinum metals by oxygen layers which are formed or reduced electrochemically during the sweeps in different potential ranges.
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