期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 113, 期 23, 页码 10222-10228出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp900582c
关键词
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资金
- Ministry of Education. Culture, Sports, Science and Technology of Japan [18350038]
- The Iwatani Naoji Foundation
- Japan Society for the Promotion of Science (JSPS) [1806343]
- Grants-in-Aid for Scientific Research [18350038] Funding Source: KAKEN
Electro-oxidation of CO adsorbed on a polycrystalline Pt electrode in the potential region of hydrogen absorption is examined by fast time-resolved surface-enhanced infrared absorption spectroscopy coupled to voltammetry or chronoamperometry. Oxidation dynamics at a weak preoxidation peak around 0.5 V (vs RHE) and the main oxidation peak around 0.7 V observed in stripping voltammetry are focused. IR spectra show that the shift of bridge-bonded CO to atop sites triggers the partial oxidation of CO adsorbed at atop sites to yield the preoxidation peak. It is also shown that CO on terraces becomes very mobile in the main oxidation region after some amount of CO being oxidized via a nucleation-and-growth mechanism and that terrace CO is oxidized faster than CO adsorbed at step edges. The result is interpreted in terms of a Langmuir-Hinshelwood type mechanism involving adsorbed CO and an oxygen-containing species (most likely OH) adsorbed at steps. The oxidation mechanism is essentially identical to that proposed in some earlier studies, but more convincing spectroscopic evidence of the mechanism is presented.
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