TY  - JOUR
AU  - Tripković, Amalija
AU  - Popović, Ksenija
AU  - Grgur, Branimir N.
AU  - Blizanac, B.
AU  - Ross, Phillip N.
AU  - Marković, Nenad M.
PY  - 2002
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2883
AB  - The kinetics of methanol oxidation on supported 47.5 wt.% Pt and 54 wt.% PtRu (with nominal Pt:Ru ratios of 2:3) catalysts are measured in 0.5 M H2SO4 and 0.1 NaOH at 295 and 333 K using thin-film rotating disk electrode (RDE) method. It was found that the activity of Pt and PtRu for methanol oxidation is a strong function of pH of solution and temperature. The kinetics are much higher in alkaline than in acid solution; at 333 K, a factor of 30 for Pt and a factor of 20 for Pt2Ru3 at 0.5 V. The pH effect is attributed to the pH competitive adsorption of oxygenated species with anions from supporting electrolytes. The activity of Pt and Pt2Ru3 catalysts at 333 K is higher (a factor of 5) than at 295 K. Irrespective of pH, only negligible differences in the kinetics are observed between Pt and on high Ru content Pt alloys, presumably owing to a slow rate of methanol dehydrogenation on the Ru-rich surface and insufficient number of Pt sites required for dissociative chemisorption of methanol.
PB  - Elsevier
T2  - Electrochimica Acta
T1  - Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions
VL  - 47
SP  - 3707
EP  - 3714
DO  - 10.1016/S0013-4686(02)00340-7
ER  - 

@article{
author = "Tripković, Amalija and Popović, Ksenija and Grgur, Branimir N. and Blizanac, B. and Ross, Phillip N. and Marković, Nenad M.",
year = "2002",
abstract = "The kinetics of methanol oxidation on supported 47.5 wt.% Pt and 54 wt.% PtRu (with nominal Pt:Ru ratios of 2:3) catalysts are measured in 0.5 M H2SO4 and 0.1 NaOH at 295 and 333 K using thin-film rotating disk electrode (RDE) method. It was found that the activity of Pt and PtRu for methanol oxidation is a strong function of pH of solution and temperature. The kinetics are much higher in alkaline than in acid solution; at 333 K, a factor of 30 for Pt and a factor of 20 for Pt2Ru3 at 0.5 V. The pH effect is attributed to the pH competitive adsorption of oxygenated species with anions from supporting electrolytes. The activity of Pt and Pt2Ru3 catalysts at 333 K is higher (a factor of 5) than at 295 K. Irrespective of pH, only negligible differences in the kinetics are observed between Pt and on high Ru content Pt alloys, presumably owing to a slow rate of methanol dehydrogenation on the Ru-rich surface and insufficient number of Pt sites required for dissociative chemisorption of methanol.",
publisher = "Elsevier",
journal = "Electrochimica Acta",
title = "Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions",
volume = "47",
pages = "3707-3714",
doi = "10.1016/S0013-4686(02)00340-7"
}

Tripković, A., Popović, K., Grgur, B. N., Blizanac, B., Ross, P. N.,& Marković, N. M.. (2002). Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions. in Electrochimica Acta
Elsevier., 47, 3707-3714.
https://doi.org/10.1016/S0013-4686(02)00340-7

Tripković A, Popović K, Grgur BN, Blizanac B, Ross PN, Marković NM. Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions. in Electrochimica Acta. 2002;47:3707-3714.
doi:10.1016/S0013-4686(02)00340-7 .

Tripković, Amalija, Popović, Ksenija, Grgur, Branimir N., Blizanac, B., Ross, Phillip N., Marković, Nenad M., "Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions" in Electrochimica Acta, 47 (2002):3707-3714,
https://doi.org/10.1016/S0013-4686(02)00340-7 . .

TY  - JOUR
AU  - Marković, Nenad
AU  - Ross, Phillip N.
PY  - 1993
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4135
AB  - The effect of chloride and (bi)sulfate anions in the supporting acid electrolyte on the chemistry of underpotential deposition of Cu on Pt(111) and Pt(100) single crystal surfaces was studied using a combination of electrochemical and nonelectrochemical techniques. The presence of these anions above a threshold concentration caused a splitting in the voltammetry peaks for Cu UPD on both Pt(111) and Pt(100), with the second or split-off peak at a lower underpotential. This splitting was attributed to competition between the Cu adatoms and the adsorbed anions and the increase in thermodynamic driving force needed to displace the anions from the Pt substrate in order to form a Cu monolayer. The magnitude of the splitting appeared to be proportional to the relative strengths of the anion-Pt bonding, being larger for chloride than (bi)sulfate on either surface and being larger for the (100) surface than for the (111) surface for either anion. By the use of ex situ AES and LEED, we determined that in nearly "Cl-free" supporting electrolyte Cu appeared to be deposited at underpotential in metallic islands (or "patches") having the Pt lattice constant (pseudomorphic growth). In the presence of Cl- the Cu was deposited at underpotentials into a Cu-Cl adlattice. At the Nernst potential, however, in both "Cl-free" and Cl-containing electrolyte, Cu formed a uniform metallic monolayer having the Pt lattice constant, i.e. a pseudomorphic monolayer.
PB  - American Chemical Society (ACS)
T2  - Langmuir
T1  - Effect of Anions on the Underpotential Deposition of Cu on kPt(lll) and Pt(100) Surfaces
VL  - 9
IS  - 2
SP  - 580
EP  - 590
DO  - 10.1021/la00026a037
ER  - 

@article{
author = "Marković, Nenad and Ross, Phillip N.",
year = "1993",
abstract = "The effect of chloride and (bi)sulfate anions in the supporting acid electrolyte on the chemistry of underpotential deposition of Cu on Pt(111) and Pt(100) single crystal surfaces was studied using a combination of electrochemical and nonelectrochemical techniques. The presence of these anions above a threshold concentration caused a splitting in the voltammetry peaks for Cu UPD on both Pt(111) and Pt(100), with the second or split-off peak at a lower underpotential. This splitting was attributed to competition between the Cu adatoms and the adsorbed anions and the increase in thermodynamic driving force needed to displace the anions from the Pt substrate in order to form a Cu monolayer. The magnitude of the splitting appeared to be proportional to the relative strengths of the anion-Pt bonding, being larger for chloride than (bi)sulfate on either surface and being larger for the (100) surface than for the (111) surface for either anion. By the use of ex situ AES and LEED, we determined that in nearly "Cl-free" supporting electrolyte Cu appeared to be deposited at underpotential in metallic islands (or "patches") having the Pt lattice constant (pseudomorphic growth). In the presence of Cl- the Cu was deposited at underpotentials into a Cu-Cl adlattice. At the Nernst potential, however, in both "Cl-free" and Cl-containing electrolyte, Cu formed a uniform metallic monolayer having the Pt lattice constant, i.e. a pseudomorphic monolayer.",
publisher = "American Chemical Society (ACS)",
journal = "Langmuir",
title = "Effect of Anions on the Underpotential Deposition of Cu on kPt(lll) and Pt(100) Surfaces",
volume = "9",
number = "2",
pages = "580-590",
doi = "10.1021/la00026a037"
}

Marković, N.,& Ross, P. N.. (1993). Effect of Anions on the Underpotential Deposition of Cu on kPt(lll) and Pt(100) Surfaces. in Langmuir
American Chemical Society (ACS)., 9(2), 580-590.
https://doi.org/10.1021/la00026a037

Marković N, Ross PN. Effect of Anions on the Underpotential Deposition of Cu on kPt(lll) and Pt(100) Surfaces. in Langmuir. 1993;9(2):580-590.
doi:10.1021/la00026a037 .

Marković, Nenad, Ross, Phillip N., "Effect of Anions on the Underpotential Deposition of Cu on kPt(lll) and Pt(100) Surfaces" in Langmuir, 9, no. 2 (1993):580-590,
https://doi.org/10.1021/la00026a037 . .