Determination of O and OH adsorption sites and coverage in situ on Pt electrodes from Pt L(sub 23) X-ray absorption spectroscopy

Article Abstract:

The adsorption of atomic oxygen and hydroxide on a platinum electrode in 0.1 M HClO(sub 4) or H(sub 2)SO(sub 4) electrolytes was studied in situ with Pt L(sub 23) X-ray absorption spectroscopy. At low coverages, OH adsorbs primarily in 1-fold coordinated atop sites, but as the coverage increases, O binds in the bridge/fcc sites, and at a still higher coverage, O adsorbs into a higher coordinated n-fold or substrate site.

Optical properties, Platinum compounds, Hydroxides, Chemical properties

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Determination of H adsorption sites on Pt/C electrodes in HCIO4 from Pt L23 X-ray absorption spectroscopy

Article Abstract:

A different procedure utilizing L3 spectra at different applied voltages was used to isolate H adsorption on the Pt electrode in the XAS spectra. The interpretation of electrochemically modulated IR spectra suggests that the delocalized H exists at low coverage and has a profound affect on water double layer.

X-ray spectroscopy, Electrodes, Electrochemical reactions

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