Underpotential deposition of lead onto Pt(100) in acid solutions: Adsorption isotherms and interface structures
Abstract
The underpotential deposition (UPD) of Pb onto Pt(100) in pure perchloric acid and in solution containing Br- was examined by classical rotating ring disk electrode (RRDPt(100)E) electrochemical methods in combination with in-situ surface X-ray scattering measurements. The total amount of Pb deposited underpotentially in 0.1 M HClO4 is approximate to 0.62 +/- 5% ML (1 ML equals 1 Pb atom per Pt surface atom), nearly equivalent to a close-packed monolayer of fully discharged Pb adatoms, e.g. 0.63 ML. In pure perchloric acid, deposition of Pb adatoms is accompanied by complete displacement of OHad from the Pt(100) surface, and in the potential range 0.15 V lt E lt 0.35 V we found an ordered surface structure with a c(2 x 2) unit cell. In perchloric acid containing bromide, the maximum Pb-upd surface coverage is approximate to 0.5 ML; the deposition of 0.5 ML of Pb adatoms is accompanied by desorption of about 0.22 ML of the Br-ad adsorbed on the Pt surface at 0.6 V (ca. 0.42 ML). Thu...s, Pb UPD on Pt(100) from solution containing Br- is a competitive process, with the total amount of Pb deposited at underpotential being less than the amount needed to form a close-packed monolayer. As a consequence, the formation of an ordered c(2 x 2) structure is observed only at E lt 0.15 V.
Source:
Journal of the Chemical Society-Faraday Transactions, 1998, 94, 22, 3373-3379Publisher:
- Royal Soc Chemistry, Cambridge
DOI: 10.1039/a804620d
ISSN: 0956-5000
WoS: 000077082700012
Scopus: 2-s2.0-33748613479
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/123456789/194 AB - The underpotential deposition (UPD) of Pb onto Pt(100) in pure perchloric acid and in solution containing Br- was examined by classical rotating ring disk electrode (RRDPt(100)E) electrochemical methods in combination with in-situ surface X-ray scattering measurements. The total amount of Pb deposited underpotentially in 0.1 M HClO4 is approximate to 0.62 +/- 5% ML (1 ML equals 1 Pb atom per Pt surface atom), nearly equivalent to a close-packed monolayer of fully discharged Pb adatoms, e.g. 0.63 ML. In pure perchloric acid, deposition of Pb adatoms is accompanied by complete displacement of OHad from the Pt(100) surface, and in the potential range 0.15 V lt E lt 0.35 V we found an ordered surface structure with a c(2 x 2) unit cell. In perchloric acid containing bromide, the maximum Pb-upd surface coverage is approximate to 0.5 ML; the deposition of 0.5 ML of Pb adatoms is accompanied by desorption of about 0.22 ML of the Br-ad adsorbed on the Pt surface at 0.6 V (ca. 0.42 ML). Thus, Pb UPD on Pt(100) from solution containing Br- is a competitive process, with the total amount of Pb deposited at underpotential being less than the amount needed to form a close-packed monolayer. As a consequence, the formation of an ordered c(2 x 2) structure is observed only at E lt 0.15 V. PB - Royal Soc Chemistry, Cambridge T2 - Journal of the Chemical Society-Faraday Transactions T1 - Underpotential deposition of lead onto Pt(100) in acid solutions: Adsorption isotherms and interface structures EP - 3379 IS - 22 SP - 3373 VL - 94 DO - 10.1039/a804620d 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(100) in pure perchloric acid and in solution containing Br- was examined by classical rotating ring disk electrode (RRDPt(100)E) electrochemical methods in combination with in-situ surface X-ray scattering measurements. The total amount of Pb deposited underpotentially in 0.1 M HClO4 is approximate to 0.62 +/- 5% ML (1 ML equals 1 Pb atom per Pt surface atom), nearly equivalent to a close-packed monolayer of fully discharged Pb adatoms, e.g. 0.63 ML. In pure perchloric acid, deposition of Pb adatoms is accompanied by complete displacement of OHad from the Pt(100) surface, and in the potential range 0.15 V lt E lt 0.35 V we found an ordered surface structure with a c(2 x 2) unit cell. In perchloric acid containing bromide, the maximum Pb-upd surface coverage is approximate to 0.5 ML; the deposition of 0.5 ML of Pb adatoms is accompanied by desorption of about 0.22 ML of the Br-ad adsorbed on the Pt surface at 0.6 V (ca. 0.42 ML). Thus, Pb UPD on Pt(100) from solution containing Br- is a competitive process, with the total amount of Pb deposited at underpotential being less than the amount needed to form a close-packed monolayer. As a consequence, the formation of an ordered c(2 x 2) structure is observed only at E lt 0.15 V.", publisher = "Royal Soc Chemistry, Cambridge", journal = "Journal of the Chemical Society-Faraday Transactions", title = "Underpotential deposition of lead onto Pt(100) in acid solutions: Adsorption isotherms and interface structures", pages = "3379-3373", number = "22", volume = "94", doi = "10.1039/a804620d" }
Marković, N., Grgur, B., Lucas, C.,& Ross, P.. (1998). Underpotential deposition of lead onto Pt(100) in acid solutions: Adsorption isotherms and interface structures. in Journal of the Chemical Society-Faraday Transactions Royal Soc Chemistry, Cambridge., 94(22), 3373-3379. https://doi.org/10.1039/a804620d
Marković N, Grgur B, Lucas C, Ross P. Underpotential deposition of lead onto Pt(100) in acid solutions: Adsorption isotherms and interface structures. in Journal of the Chemical Society-Faraday Transactions. 1998;94(22):3373-3379. doi:10.1039/a804620d .
Marković, NM, Grgur, Branimir, Lucas, CA, Ross, PN, "Underpotential deposition of lead onto Pt(100) in acid solutions: Adsorption isotherms and interface structures" in Journal of the Chemical Society-Faraday Transactions, 94, no. 22 (1998):3373-3379, https://doi.org/10.1039/a804620d . .