Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume -, Issue -, Pages 3589-3593Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.3c005203589J
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The initial step of electrochemical surface oxidation involves the extraction of metal atoms from their lattice sites to form a growing oxide. By conducting fast simultaneous electrochemical and in situ high-energy surface X-ray diffraction measurements, it has been demonstrated that the extraction of Pt atoms from Pt(111) is a fast process driven by potential, while the charge transfer for the formation of oxygen-containing species occurs at a much slower rate and appears to be decoupled from the extraction process. It is thus concluded that potential plays an independent and crucial role in electrochemical surface oxidation.
The first step of electrochemical surface oxidation is extraction of a metal atom from its lattice site to a location in a growing oxide. Here we show by fast simultaneous electrochemical and in situ high-energy surface X-ray diffraction measurements that the initial extraction of Pt atoms from Pt(111) is a fast, potential-driven process, whereas charge transfer for the related formation of adsorbed oxygen-containing species occurs on a much slower time scale and is evidently uncoupled from the extraction process. It is concluded that potential plays a key independent role in electrochemical surface oxidation.
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