Underpotential deposition of lead on Pt(111) in the presence of bromide: RRDPt(111)E and X-ray scattering studies
Abstract
The underpotential deposition (upd) of Pb onto Pt(lll) in solution containing Br- was examined by classical RRDP(111)E electrochemical methods in combination with in situ surface X-ray scattering measurements. The results show that Pb upd onto Pt(lll) in the presence of bromide is a competitive process with the total amount of Pb deposited at underpotential being only ca. 0.51 +/- 5% ML, less than the amount needed to form a close-packed monolayer, 0.63 ML (1 ML equals 1 Pb atom per Pt surface atom). Deposition of Pb adatoms is accompanied by desorption of about one-half of the bromide adsorbed on the Pt surface at higher potentials, leaving co-adsorbed bromide both in and on-top-of the adlayer. In the potential region where the ratio of co-adsorbed species is close to one (E approximate to OV) there is the slow formation (over a period of ca. 2h) of an ordered surface alloy, which has a p(2 x 2) unit cell. No other ordered structures of Pb are observed in the underpotential region.
Keywords:
lead / underpotential deposition / Pt(111) / bromine anions / RRDE / surface X-ray scatteringSource:
Journal of Electroanalytical Chemistry, 1998, 448, 2, 183-188Publisher:
- Elsevier Science Sa, Lausanne
DOI: 10.1016/S0022-0728(97)00012-0
ISSN: 0022-0728
WoS: 000075475600005
Scopus: 2-s2.0-0032064066
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Marković, NM AU - Grgur, Branimir AU - Lucas, CA AU - Ross, PN PY - 1998 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/210 AB - The underpotential deposition (upd) of Pb onto Pt(lll) in solution containing Br- was examined by classical RRDP(111)E electrochemical methods in combination with in situ surface X-ray scattering measurements. The results show that Pb upd onto Pt(lll) in the presence of bromide is a competitive process with the total amount of Pb deposited at underpotential being only ca. 0.51 +/- 5% ML, less than the amount needed to form a close-packed monolayer, 0.63 ML (1 ML equals 1 Pb atom per Pt surface atom). Deposition of Pb adatoms is accompanied by desorption of about one-half of the bromide adsorbed on the Pt surface at higher potentials, leaving co-adsorbed bromide both in and on-top-of the adlayer. In the potential region where the ratio of co-adsorbed species is close to one (E approximate to OV) there is the slow formation (over a period of ca. 2h) of an ordered surface alloy, which has a p(2 x 2) unit cell. No other ordered structures of Pb are observed in the underpotential region. PB - Elsevier Science Sa, Lausanne T2 - Journal of Electroanalytical Chemistry T1 - Underpotential deposition of lead on Pt(111) in the presence of bromide: RRDPt(111)E and X-ray scattering studies EP - 188 IS - 2 SP - 183 VL - 448 DO - 10.1016/S0022-0728(97)00012-0 ER -
@article{ author = "Marković, NM and Grgur, Branimir and Lucas, CA and Ross, PN", year = "1998", abstract = "The underpotential deposition (upd) of Pb onto Pt(lll) in solution containing Br- was examined by classical RRDP(111)E electrochemical methods in combination with in situ surface X-ray scattering measurements. The results show that Pb upd onto Pt(lll) in the presence of bromide is a competitive process with the total amount of Pb deposited at underpotential being only ca. 0.51 +/- 5% ML, less than the amount needed to form a close-packed monolayer, 0.63 ML (1 ML equals 1 Pb atom per Pt surface atom). Deposition of Pb adatoms is accompanied by desorption of about one-half of the bromide adsorbed on the Pt surface at higher potentials, leaving co-adsorbed bromide both in and on-top-of the adlayer. In the potential region where the ratio of co-adsorbed species is close to one (E approximate to OV) there is the slow formation (over a period of ca. 2h) of an ordered surface alloy, which has a p(2 x 2) unit cell. No other ordered structures of Pb are observed in the underpotential region.", publisher = "Elsevier Science Sa, Lausanne", journal = "Journal of Electroanalytical Chemistry", title = "Underpotential deposition of lead on Pt(111) in the presence of bromide: RRDPt(111)E and X-ray scattering studies", pages = "188-183", number = "2", volume = "448", doi = "10.1016/S0022-0728(97)00012-0" }
Marković, N., Grgur, B., Lucas, C.,& Ross, P.. (1998). Underpotential deposition of lead on Pt(111) in the presence of bromide: RRDPt(111)E and X-ray scattering studies. in Journal of Electroanalytical Chemistry Elsevier Science Sa, Lausanne., 448(2), 183-188. https://doi.org/10.1016/S0022-0728(97)00012-0
Marković N, Grgur B, Lucas C, Ross P. Underpotential deposition of lead on Pt(111) in the presence of bromide: RRDPt(111)E and X-ray scattering studies. in Journal of Electroanalytical Chemistry. 1998;448(2):183-188. doi:10.1016/S0022-0728(97)00012-0 .
Marković, NM, Grgur, Branimir, Lucas, CA, Ross, PN, "Underpotential deposition of lead on Pt(111) in the presence of bromide: RRDPt(111)E and X-ray scattering studies" in Journal of Electroanalytical Chemistry, 448, no. 2 (1998):183-188, https://doi.org/10.1016/S0022-0728(97)00012-0 . .