Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition
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2006
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Polycrystalline Pt electrode was modified by underpotential deposition (upd) of nickel. The modification was performed by potential cycling in phosphate buffer pH 7. 0 containing NiSO4, 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 theta(Ni)=0.3, the current density was a factor of 2 higher compared to bare Pt (at the potential of 0.85 V). 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 t...he inhibition of OH adsorption on Pt by OH ligands attached on neighboring Ni atoms.
Ključne reči:
underpotential deposition / nickel / platinum / oxygen reduction / open-circuit potential-relaxation methodIzvor:
Journal of Solid State Electrochemistry, 2006, 11, 1, 77-83Izdavač:
- Springer, New York
DOI: 10.1007/s10008-005-0072-0
ISSN: 1432-8488
WoS: 000244199300011
Scopus: 2-s2.0-33749609716
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Obradović, Maja AU - Grgur, Branimir AU - Gojković, Snežana Lj. AU - Vračar, Ljiljana M. PY - 2006 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/978 AB - Polycrystalline Pt electrode was modified by underpotential deposition (upd) of nickel. The modification was performed by potential cycling in phosphate buffer pH 7. 0 containing NiSO4, 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 theta(Ni)=0.3, the current density was a factor of 2 higher compared to bare Pt (at the potential of 0.85 V). 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, New York T2 - Journal of Solid State Electrochemistry T1 - Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition EP - 83 IS - 1 SP - 77 VL - 11 DO - 10.1007/s10008-005-0072-0 ER -
@article{ author = "Obradović, Maja and Grgur, Branimir and Gojković, Snežana Lj. and Vračar, Ljiljana M.", year = "2006", abstract = "Polycrystalline Pt electrode was modified by underpotential deposition (upd) of nickel. The modification was performed by potential cycling in phosphate buffer pH 7. 0 containing NiSO4, 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 theta(Ni)=0.3, the current density was a factor of 2 higher compared to bare Pt (at the potential of 0.85 V). 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, New York", journal = "Journal of Solid State Electrochemistry", title = "Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition", pages = "83-77", number = "1", volume = "11", doi = "10.1007/s10008-005-0072-0" }
Obradović, M., Grgur, B., Gojković, S. Lj.,& Vračar, L. M.. (2006). Enhancement of the electrochemical reduction of oxygen at platinum by nickel underpotential deposition. in Journal of Solid State Electrochemistry Springer, New York., 11(1), 77-83. https://doi.org/10.1007/s10008-005-0072-0
Obradović M, Grgur B, Gojković SL, Vračar LM. 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, Gojković, Snežana Lj., Vračar, Ljiljana M., "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 . .