Dynamics of a surface phase transition as monitored by in situ second harmonic generation

Boguslaw Pozniak; Daniel Alberto Scherson

doi:10.1021/ja0351185

Dynamics of a surface phase transition as monitored by in situ second harmonic generation

Boguslaw Pozniak, Daniel Alberto Scherson

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

The dynamics of the (2 × 2)-3CO ↔ dilute phase transition involving CO adsorbed on Pt(111) microfacets has been monitored in situ in a CO-saturated acidic electrolyte using potential step-second harmonic generation techniques. Apparent time constants derived strictly from the optical data were found to be orders of magnitude slower for the forward process as compared to those of the reverse process. This behavior is consistent with the activated nature of CO electrooxidation, which requires the presence of a neighboring adsorbed oxygenated species, for example, hydroxyl, for the process to ensue.

Original language	English
Pages (from-to)	7488-7489
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	125
Issue number	25
DOIs	https://doi.org/10.1021/ja0351185
Publication status	Published - 2003 Jun 25
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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AB - The dynamics of the (2 × 2)-3CO ↔ dilute phase transition involving CO adsorbed on Pt(111) microfacets has been monitored in situ in a CO-saturated acidic electrolyte using potential step-second harmonic generation techniques. Apparent time constants derived strictly from the optical data were found to be orders of magnitude slower for the forward process as compared to those of the reverse process. This behavior is consistent with the activated nature of CO electrooxidation, which requires the presence of a neighboring adsorbed oxygenated species, for example, hydroxyl, for the process to ensue.

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