TY  - JOUR
AU  - Obradović, Maja
AU  - Grgur, Branimir N.
AU  - Gojković, Snežana Lj.
AU  - Vračar, Ljubomir
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4262
AB  - Polycrystalline Pt electrode was modified by underpotential deposition (upd) of nickel. The modification was performed by potential cycling in phosphate buffer pH7. 0 containing NiSO 4 , in which hydrogen and nickel upd processes were well separated. The maximum Ni upd coverage was found to be 0.3. Oxygen reduction was studied at bare and nickel upd-modified Pt. It was found that the reaction rate increased with increasing Ni upd coverage. At θ(Ni)=0.3, the current density was a factor of 2 higher compared to bare Pt (at the potential of 0.85V). The capacitance of the electrode interface was determined in potential-relaxation experiments following interruption of the polarization current. It was found that the pseudocapacitance owing to a coverage by the adsorbed reaction intermediates was higher on the Ni-modified Pt surface than on bare Pt, which resulted in higher reaction rate. The influence of Ni adatoms on the surface coverage by the reaction intermediates was attributed to the inhibition of OH adsorption on Pt by OH ligands attached on neighboring Ni atoms.
PB  - Springer Nature
T2  - Journal of Solid State Electrochemistry
T1  - Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition
VL  - 11
IS  - 1
SP  - 77
EP  - 83
DO  - 10.1007/s10008-005-0072-0
ER  - 

@article{
author = "Obradović, Maja and Grgur, Branimir N. and Gojković, Snežana Lj. and Vračar, Ljubomir",
year = "2006",
abstract = "Polycrystalline Pt electrode was modified by underpotential deposition (upd) of nickel. The modification was performed by potential cycling in phosphate buffer pH7. 0 containing NiSO 4 , in which hydrogen and nickel upd processes were well separated. The maximum Ni upd coverage was found to be 0.3. Oxygen reduction was studied at bare and nickel upd-modified Pt. It was found that the reaction rate increased with increasing Ni upd coverage. At θ(Ni)=0.3, the current density was a factor of 2 higher compared to bare Pt (at the potential of 0.85V). The capacitance of the electrode interface was determined in potential-relaxation experiments following interruption of the polarization current. It was found that the pseudocapacitance owing to a coverage by the adsorbed reaction intermediates was higher on the Ni-modified Pt surface than on bare Pt, which resulted in higher reaction rate. The influence of Ni adatoms on the surface coverage by the reaction intermediates was attributed to the inhibition of OH adsorption on Pt by OH ligands attached on neighboring Ni atoms.",
publisher = "Springer Nature",
journal = "Journal of Solid State Electrochemistry",
title = "Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition",
volume = "11",
number = "1",
pages = "77-83",
doi = "10.1007/s10008-005-0072-0"
}

Obradović, M., Grgur, B. N., Gojković, S. Lj.,& Vračar, L.. (2006). Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition. in Journal of Solid State Electrochemistry
Springer Nature., 11(1), 77-83.
https://doi.org/10.1007/s10008-005-0072-0

Obradović M, Grgur BN, Gojković SL, Vračar L. Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition. in Journal of Solid State Electrochemistry. 2006;11(1):77-83.
doi:10.1007/s10008-005-0072-0 .

Obradović, Maja, Grgur, Branimir N., Gojković, Snežana Lj., Vračar, Ljubomir, "Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition" in Journal of Solid State Electrochemistry, 11, no. 1 (2006):77-83,
https://doi.org/10.1007/s10008-005-0072-0 . .

TY  - JOUR
AU  - Vračar, Ljubomir
AU  - Dražić, Dragutin M.
PY  - 2002
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4090
AB  - Adsorption and corrosion inhibitive properties of three different organic molecules: 2-naphthalenesulfonic acid, 2,7-naphthalenedisulfonic acid and 2-naphthol-3,6-disulfonic acid are investigated on Armco-iron electrode cathodically polarized, in 0.5 mol dm -3 H 2 SO 4 solution. The examinations show that the three organic molecules behave as a cathodic corrosion inhibitors. The inhibitive efficiency, changes with the number of functional groups substituted on benzene ring and increases with concentration. The experimentally obtained adsorption isoterms follow the Frumkin equation [0/n(1-0) n ] exp(-2aθ) = Bc and the best fit is obtained for n = 2 (for 2-NSA) and n = 3 (for 2,7-NDSA and 2N-3,6-DSA). The calculated values for the parameter a are 2.1-2.9 and Gibbs energies are 17-21 kJ mol -1 . The adsorption rate constants are very small, proving that iron surface permanently changes due to the corrosion processes.
PB  - Elsevier
T2  - Corrosion Science
T1  - Adsorption and corrosion inhibitive properties of some organic molecules on iron electrode in sulfuric acid
VL  - 44
IS  - 8
SP  - 1669
EP  - 1680
DO  - 10.1016/S0010-938X(01)00166-4
ER  - 

@article{
author = "Vračar, Ljubomir and Dražić, Dragutin M.",
year = "2002",
abstract = "Adsorption and corrosion inhibitive properties of three different organic molecules: 2-naphthalenesulfonic acid, 2,7-naphthalenedisulfonic acid and 2-naphthol-3,6-disulfonic acid are investigated on Armco-iron electrode cathodically polarized, in 0.5 mol dm -3 H 2 SO 4 solution. The examinations show that the three organic molecules behave as a cathodic corrosion inhibitors. The inhibitive efficiency, changes with the number of functional groups substituted on benzene ring and increases with concentration. The experimentally obtained adsorption isoterms follow the Frumkin equation [0/n(1-0) n ] exp(-2aθ) = Bc and the best fit is obtained for n = 2 (for 2-NSA) and n = 3 (for 2,7-NDSA and 2N-3,6-DSA). The calculated values for the parameter a are 2.1-2.9 and Gibbs energies are 17-21 kJ mol -1 . The adsorption rate constants are very small, proving that iron surface permanently changes due to the corrosion processes.",
publisher = "Elsevier",
journal = "Corrosion Science",
title = "Adsorption and corrosion inhibitive properties of some organic molecules on iron electrode in sulfuric acid",
volume = "44",
number = "8",
pages = "1669-1680",
doi = "10.1016/S0010-938X(01)00166-4"
}

Vračar, L.,& Dražić, D. M.. (2002). Adsorption and corrosion inhibitive properties of some organic molecules on iron electrode in sulfuric acid. in Corrosion Science
Elsevier., 44(8), 1669-1680.
https://doi.org/10.1016/S0010-938X(01)00166-4

Vračar L, Dražić DM. Adsorption and corrosion inhibitive properties of some organic molecules on iron electrode in sulfuric acid. in Corrosion Science. 2002;44(8):1669-1680.
doi:10.1016/S0010-938X(01)00166-4 .

Vračar, Ljubomir, Dražić, Dragutin M., "Adsorption and corrosion inhibitive properties of some organic molecules on iron electrode in sulfuric acid" in Corrosion Science, 44, no. 8 (2002):1669-1680,
https://doi.org/10.1016/S0010-938X(01)00166-4 . .