Oxygen reduction on polycrystalline palladium in acid and alkaline solutions: topographical and chemical Pd surface changes
Abstract
Oxygen reduction reaction (ORR) was investigated on polycrystalline palladium, Pd(poly), in acid and alkaline solutions using rotating-disc electrode technique. Pd(poly) was prepared in non-aqueous media which provided surface with good quality and reproducibility. According to cyclic voltammetry curves and to the analysis of polarization curves for ORR and of ones obtained separately for hydrogen peroxide reduction/oxidation reactions, ORR in both media proceeds mainly through 4e-series pathway in the potential regions where Pd surface is either oxide free or oxidized to PdOH. ORR occurs partly through 2e-reduction in the potential region where PdO is present on the surface. As revealed by cyclic voltammetry, spectroscopic ellipsometry and by atomic force microscopy, Pd(poly) surface undergoes both topography and chemical changes during ORR. Pd surface roughness as well as the degree of its oxidation increase during ORR.
Keywords:
palladium / oxygen reduction / rotating disc / spectroscopic ellipsometry / atomic force microscopySource:
Electrochimica Acta, 2015, 169, 22-31Publisher:
- Oxford : Pergamon-Elsevier Science Ltd
Funding / projects:
DOI: 10.1016/j.electacta.2015.04.032
ISSN: 0013-4686
WoS: 000355007400004
Scopus: 2-s2.0-84927725651
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Institution/Community
IHTMTY - JOUR AU - Srejić, Irina AU - Rakočević, Zlatko Lj. AU - Nenadović, Miloš AU - Štrbac, Svetlana PY - 2015 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/1642 AB - Oxygen reduction reaction (ORR) was investigated on polycrystalline palladium, Pd(poly), in acid and alkaline solutions using rotating-disc electrode technique. Pd(poly) was prepared in non-aqueous media which provided surface with good quality and reproducibility. According to cyclic voltammetry curves and to the analysis of polarization curves for ORR and of ones obtained separately for hydrogen peroxide reduction/oxidation reactions, ORR in both media proceeds mainly through 4e-series pathway in the potential regions where Pd surface is either oxide free or oxidized to PdOH. ORR occurs partly through 2e-reduction in the potential region where PdO is present on the surface. As revealed by cyclic voltammetry, spectroscopic ellipsometry and by atomic force microscopy, Pd(poly) surface undergoes both topography and chemical changes during ORR. Pd surface roughness as well as the degree of its oxidation increase during ORR. PB - Oxford : Pergamon-Elsevier Science Ltd T2 - Electrochimica Acta T1 - Oxygen reduction on polycrystalline palladium in acid and alkaline solutions: topographical and chemical Pd surface changes VL - 169 SP - 22 EP - 31 DO - 10.1016/j.electacta.2015.04.032 ER -
@article{ author = "Srejić, Irina and Rakočević, Zlatko Lj. and Nenadović, Miloš and Štrbac, Svetlana", year = "2015", abstract = "Oxygen reduction reaction (ORR) was investigated on polycrystalline palladium, Pd(poly), in acid and alkaline solutions using rotating-disc electrode technique. Pd(poly) was prepared in non-aqueous media which provided surface with good quality and reproducibility. According to cyclic voltammetry curves and to the analysis of polarization curves for ORR and of ones obtained separately for hydrogen peroxide reduction/oxidation reactions, ORR in both media proceeds mainly through 4e-series pathway in the potential regions where Pd surface is either oxide free or oxidized to PdOH. ORR occurs partly through 2e-reduction in the potential region where PdO is present on the surface. As revealed by cyclic voltammetry, spectroscopic ellipsometry and by atomic force microscopy, Pd(poly) surface undergoes both topography and chemical changes during ORR. Pd surface roughness as well as the degree of its oxidation increase during ORR.", publisher = "Oxford : Pergamon-Elsevier Science Ltd", journal = "Electrochimica Acta", title = "Oxygen reduction on polycrystalline palladium in acid and alkaline solutions: topographical and chemical Pd surface changes", volume = "169", pages = "22-31", doi = "10.1016/j.electacta.2015.04.032" }
Srejić, I., Rakočević, Z. Lj., Nenadović, M.,& Štrbac, S.. (2015). Oxygen reduction on polycrystalline palladium in acid and alkaline solutions: topographical and chemical Pd surface changes. in Electrochimica Acta Oxford : Pergamon-Elsevier Science Ltd., 169, 22-31. https://doi.org/10.1016/j.electacta.2015.04.032
Srejić I, Rakočević ZL, Nenadović M, Štrbac S. Oxygen reduction on polycrystalline palladium in acid and alkaline solutions: topographical and chemical Pd surface changes. in Electrochimica Acta. 2015;169:22-31. doi:10.1016/j.electacta.2015.04.032 .
Srejić, Irina, Rakočević, Zlatko Lj., Nenadović, Miloš, Štrbac, Svetlana, "Oxygen reduction on polycrystalline palladium in acid and alkaline solutions: topographical and chemical Pd surface changes" in Electrochimica Acta, 169 (2015):22-31, https://doi.org/10.1016/j.electacta.2015.04.032 . .