Journal Article10.1021/J100293A020
Electrooxidation of methanol on iridium in acidic solutions: electrocatalysis and surface characterization by infrared spectroscopy
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TL;DR: In this paper, the catalytic activity of iridium was investigated in H/sub 2/SO/sub 4/ and CHlO/ sub 4/ solutions in connection with catalytic activities of the electrode in various oxidation states and of the adsorbed CO observed by infrared spectrometry.
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Abstract: Electrooxidation of methanol was studied on iridium in H/sub 2/SO/sub 4/ and CHlO/sub 4/ solutions in connection with catalytic activities of the electrode in various oxidation states and of the adsorbed CO observed by infrared spectrometry. Iridium was found to show higher catalytic activity than platinum at low positive potential regions. The catalytic activity of iridium decreased with time at a constant-potential polarization and was inhibited by the introduction of CO gas. In situ infrared spectra were observed in the measurement conditions of electrode potential modulation and of constant electrode potential. The spectra for the above different conditions agreed in the wavenumber region of the spectra but not in absorbance intensity or in its relative values at different electrode potentials. The spectral maxima of the adsorbed CO, derived from methanol, were 2045 cm/sup -1/ at 0.2 V (vs. RHE) and 2054 cm/sup -1/ at 0.5 V. These maxima were shifted 20 cm/sup -1/ to higher wavenumber by the addition of CO gas. The catalytic activity of iridium was discussed in relation to redox coupling of iridium species in different oxidation states, the rate of their redox coupling, and the adsorbed CO observed by infrared spectroscopy.
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