Adsorption of hydrogen on Pt(111) and Pt(100) surfaces and its role in the HOR.

Journal Article · Wed Oct 01 04:00:00 EDT 2008 · Electrochem. Comm.

DOI:https://doi.org/10.1016/j.elecom.2008.08.019· OSTI ID:1000665

Strmcnik, D; Tripkovic, D; van der Vliet, D; Stamenkovic, V; Markovic, N M

Hydrogen adsorption isotherms, evaluated by combination of cyclic voltammetry and chronoamperometry, are reported on Pt(1 1 1) and Pt(1 0 0) surfaces in 0.1 M HClO{sub 4}. We found that at E > 0.05 V Pt(1 1 1) and Pt(1 0 0) are only partially covered by the adsorbed hydrogen (H{sub ad}). On both surfaces, a full monolayer of the adsorbed hydrogen is completed at -0.1 V, i.e. the adsorption of atomic hydrogen is observed in the hydrogen evolution potential region. We also found, that the activity of the hydrogen oxidation reaction is mirrored by the shape of the hydrogen adsorption isotherms, implying that H{sub ad} is in fact a spectator in the HOR.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1000665
• Report Number(s): ANLMSD/JA-68529
• Journal Information: Electrochem. Comm., Journal Name: Electrochem. Comm. Journal Issue: 10 ; Oct. 2008 Vol. 10; ISSN 1388-2481
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

08 HYDROGEN
ADSORPTION
ADSORPTION ISOTHERMS
HYDROGEN
OXIDATION
SHAPE