On the effect of tungsten on CO oxidation at Pt electrodes |
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Authors: | T?Nagel N?Bogolowski G?Samjeske Email author" target="_blank">H?BaltruschatEmail author |
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Institution: | (1) Institut für Physikalische Chemie, Universität Bonn, Römerstrasse 164, 53117 Bonn, Germany |
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Abstract: | The co-catalytic effect of W on the oxidation of CO and methanol is investigated by using differential electrochemical mass spectrometry (DEMS). DEMS reveals that CO oxidation starts at 120 mV, overlapping with W oxidation. The action of W consists in shifting the pre-peak from 450 mV (as observed on pure Pt) to 200 mV. In this shifted pre-peak only 2% of the total adsorbed CO is oxidized independently from the W coverage, as compared to 10% on pure Pt. A correlation between the surface coverage of W as determined by XPS with the W oxidation peak charge in cyclic voltammetry suggests that the oxidation is a six-electron process.Dedicated to Prof. Wolf Vielstich on the occasion of his 80th birthday in recognition of his numerous contributions to interfacial electrochemistry. |
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Keywords: | Tungsten UPD CO oxidation Pt electrode XPS DEMS |
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