Structural effects during CO adsorption on Pt-bimetallic surfaces I. The Pt(100) electrode
Abstract
Synchrotron surface X-ray scattering (SXS) and rotating ring disk electrode (RRDE) measurements have been performed during the coadsorption of metal adatoms and carbon monoxide on the Pt(100) surface in an electrochemical environment. Whereas RRDE experiments give a macroscopic view of the coadsorption process, via the adsorption isotherms of deposited metal adatoms, the SXS measurements give insight into the structural changes that occur on the atomic level. The results show that both underpotentially deposited (UPD) Cu and Pb are displaced by CO from the Pt(100) surface, the driving force being the resulting negative shift in the surface free energy. When bromide is present in a c(2 x 2) structure on top of the Cu monolayer there is an activation barrier to the displacement effect. Coadsorption of CO then enhances the c(2 x 2) structure by displacing disordered Cu or Br that is present on the surface. Cycling the electrode potential, during which the Cu monolayer is desorbed, leads t...o complete blocking of the UPD process by CO. In contrast to these results, the reversible formation of a Bi c(2 x 2) UPD adlayer is unaffected by the presence of solution CO.
Keywords:
bromine / carbon monoxide / copper / lead / metallic surfaces / platinum / rotating ring disk electrode (RRDE) / surface structure, morphology, roughness and topography / X-ray scattering / diffraction and reflectionSource:
Surface Science, 2000, 448, 2-3, 65-76Publisher:
- Elsevier, Amsterdam
DOI: 10.1016/S0039-6028(99)01127-9
ISSN: 0039-6028
WoS: 000085844800005
Scopus: 2-s2.0-0033897225
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Lucas, CA AU - Marković, NM AU - Grgur, Branimir AU - Ross, PN PY - 2000 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/283 AB - Synchrotron surface X-ray scattering (SXS) and rotating ring disk electrode (RRDE) measurements have been performed during the coadsorption of metal adatoms and carbon monoxide on the Pt(100) surface in an electrochemical environment. Whereas RRDE experiments give a macroscopic view of the coadsorption process, via the adsorption isotherms of deposited metal adatoms, the SXS measurements give insight into the structural changes that occur on the atomic level. The results show that both underpotentially deposited (UPD) Cu and Pb are displaced by CO from the Pt(100) surface, the driving force being the resulting negative shift in the surface free energy. When bromide is present in a c(2 x 2) structure on top of the Cu monolayer there is an activation barrier to the displacement effect. Coadsorption of CO then enhances the c(2 x 2) structure by displacing disordered Cu or Br that is present on the surface. Cycling the electrode potential, during which the Cu monolayer is desorbed, leads to complete blocking of the UPD process by CO. In contrast to these results, the reversible formation of a Bi c(2 x 2) UPD adlayer is unaffected by the presence of solution CO. PB - Elsevier, Amsterdam T2 - Surface Science T1 - Structural effects during CO adsorption on Pt-bimetallic surfaces I. The Pt(100) electrode EP - 76 IS - 2-3 SP - 65 VL - 448 DO - 10.1016/S0039-6028(99)01127-9 ER -
@article{ author = "Lucas, CA and Marković, NM and Grgur, Branimir and Ross, PN", year = "2000", abstract = "Synchrotron surface X-ray scattering (SXS) and rotating ring disk electrode (RRDE) measurements have been performed during the coadsorption of metal adatoms and carbon monoxide on the Pt(100) surface in an electrochemical environment. Whereas RRDE experiments give a macroscopic view of the coadsorption process, via the adsorption isotherms of deposited metal adatoms, the SXS measurements give insight into the structural changes that occur on the atomic level. The results show that both underpotentially deposited (UPD) Cu and Pb are displaced by CO from the Pt(100) surface, the driving force being the resulting negative shift in the surface free energy. When bromide is present in a c(2 x 2) structure on top of the Cu monolayer there is an activation barrier to the displacement effect. Coadsorption of CO then enhances the c(2 x 2) structure by displacing disordered Cu or Br that is present on the surface. Cycling the electrode potential, during which the Cu monolayer is desorbed, leads to complete blocking of the UPD process by CO. In contrast to these results, the reversible formation of a Bi c(2 x 2) UPD adlayer is unaffected by the presence of solution CO.", publisher = "Elsevier, Amsterdam", journal = "Surface Science", title = "Structural effects during CO adsorption on Pt-bimetallic surfaces I. The Pt(100) electrode", pages = "76-65", number = "2-3", volume = "448", doi = "10.1016/S0039-6028(99)01127-9" }
Lucas, C., Marković, N., Grgur, B.,& Ross, P.. (2000). Structural effects during CO adsorption on Pt-bimetallic surfaces I. The Pt(100) electrode. in Surface Science Elsevier, Amsterdam., 448(2-3), 65-76. https://doi.org/10.1016/S0039-6028(99)01127-9
Lucas C, Marković N, Grgur B, Ross P. Structural effects during CO adsorption on Pt-bimetallic surfaces I. The Pt(100) electrode. in Surface Science. 2000;448(2-3):65-76. doi:10.1016/S0039-6028(99)01127-9 .
Lucas, CA, Marković, NM, Grgur, Branimir, Ross, PN, "Structural effects during CO adsorption on Pt-bimetallic surfaces I. The Pt(100) electrode" in Surface Science, 448, no. 2-3 (2000):65-76, https://doi.org/10.1016/S0039-6028(99)01127-9 . .