Generation of surface hydronium from water and hydrogen coadsorbed on Pt(111)

The effective electrode potential of an ultrahigh vacuum model of the electrode-electrolyte interface was controlled through coadsorption of varying amounts of hydrogen with water on Pt(111) at 100 K. High resolution electron energy loss spectroscopy (HREELS) demonstrated formation of surface H 3O +...

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Bibliographic Details
Published in:Surface science 1988-11, Vol.206 (1), p.187-202
Main Authors: Wagner, Frederick T., Moylan, Thomas E.
Format: Article
Language:English
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Summary:The effective electrode potential of an ultrahigh vacuum model of the electrode-electrolyte interface was controlled through coadsorption of varying amounts of hydrogen with water on Pt(111) at 100 K. High resolution electron energy loss spectroscopy (HREELS) demonstrated formation of surface H 3O + ions upon heating > 20% saturation coverages of hydrogen with water to 150 K, indicating an effective electrode potential below the potential of zero charge (pzc). Comparison of these results with cyclic voltanunetry of well-ordered Pt(111) in weakly-adsorbing electrolytes suggests that the pzc lies around + 0.2 V RHE and that the breadth of the hydrogen regions of the voltammograms is due to potential dependent interactions between coadsorbed H and H 3O +.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(88)90021-0