Surface-science simulation study of the electrochemical charge-transfer reaction (H)ad + (H2O)ad→(H3O+)ad + e−metal on Pt(111) and Cu(110)

✍ Scribed by D. Lackey; J. Schott; J.K. Sass; S.I. Woo; F.T. Wagner

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 413 KB
• Volume: 184
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(91)85123-e

✦ Synopsis

By coadsorbing hydrogen and water on Pt( 111) and Cu( I lo), and isotopically substituting (H),.,by (D)ad, we have unambiguously identified the occurrence of the electrochemical reaction (H)ad+ (H*O),,~(H,O+),+e,,,, in UHV. On Pt( I I1 ), a substantial fraction of the hydrogen is oxidized to (H,O+),, whereas on Cu( I IO), this does not occur. On Pt( I I I ), the proton in the initial (H,O+ ),,_, complex is seen to exchange readily with excess water. Hydrated proton formation on Pt( 111) was also observed at higher temperatures, where water only has a finite residence time on the surface.