On the study of adsorbed species at platinum from methanol, formic acid and reduced carbon dioxide via in situ FT-ir spectroscopy
✍ Scribed by T. Iwasita; F.C. Nart; B. Lopez; W. Vielstich
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 624 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Abohct-Three different coordinated forms of CO adsorbed to the platinum surface were observed for methanol, formic acid and reduced carbon dioxide: linear-, bridge-and multi-bonded CO. Using a new experimental approach absolute absorption bands are observed for the adsorption of methanol and reduced carbon dioxide. Sample spectra are computed with respect to a reference spectrum which is taken before adsorption. In this way the presence of a COH adsorbate is demonstrated. The absolute band procedure must be applied to observe features exhibiting only a small dependence on potential, because in this case using the usual SNIFf-irS procedure (first adsorption and then collection of spectra at two potentials) the signals may cancel out when computing the difference spectra. Using Pt/Ru as a bifunctional catalyst for water splitting and CO/COH oxidation, surface poisoning during the oxidation of methanol is strongly diminished: current-potential relationships of technical interest are obtained.