Catalysis of oxygen reduction on Au modified by Pd nanoislands in perchloric acid solution
Abstract
Oxygen reduction reaction (ORR) was studied on polycrystalline gold, Au(poly), modified by nanosized palladium islands in 0.1 M HClO4 solution using rotating disc electrode technique. Paladium was spontaneously deposited from 1 mM PdSO4 center dot 2H(2)O + 0.5 M H2SO4 solution for various deposition times at a submonolayer coverage. Topography of obtained Pd/Au(poly) surfaces was observed by tapping mode atomic force microscopy (AFM), while chemical surface composition changes were detected by simultaneously performed phase AFM. Deposited Pd islands were nonuniform in size and randomly distributed over the gold substrate. Size and number of Pd islands increase with the increase of the deposition time, and consequently surface coverage increases too. Deposited Pd was also identified by the changes in cyclic voltammetry (CV) profiles from which an active surface area was estimated. Obtained Pd/Au(poly) surfaces have shown a significant catalytic activity towards oxygen reduction reaction... which increases with the increase of Pd islands coverage. The initial potential of ORR was shifted positively, while reaction pathway changes from 2e-reduction on pure gold to 4e-reduction on Pd modified gold. Additionally, obtained Pd/Au(poly) surfaces have shown a significant activity towards hydrogen peroxide reduction (HPRR), which appear as an intermediate during ORR. This supports the assumption that ORR on Pd/Au(poly) occurs partly through 4e-series reduction pathway, the fraction of which increases with the increase of Pd coverage.
Keywords:
Gold / Palladium / AFM / RDE / Oxygen reductionSource:
Electrochimica Acta, 2012, 64, 140-146Publisher:
- Oxford : Pergamon-Elsevier Science Ltd
Funding / projects:
DOI: 10.1016/j.electacta.2011.12.130
ISSN: 0013-4686
WoS: 000301617300017
Scopus: 2-s2.0-84857053971
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Institution/Community
IHTMTY - JOUR AU - Srejić, Irina AU - Smiljanić, Milutin AU - Grgur, Branimir N. AU - Rakočević, Zlatko Lj. AU - Štrbac, Svetlana PY - 2012 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/1015 AB - Oxygen reduction reaction (ORR) was studied on polycrystalline gold, Au(poly), modified by nanosized palladium islands in 0.1 M HClO4 solution using rotating disc electrode technique. Paladium was spontaneously deposited from 1 mM PdSO4 center dot 2H(2)O + 0.5 M H2SO4 solution for various deposition times at a submonolayer coverage. Topography of obtained Pd/Au(poly) surfaces was observed by tapping mode atomic force microscopy (AFM), while chemical surface composition changes were detected by simultaneously performed phase AFM. Deposited Pd islands were nonuniform in size and randomly distributed over the gold substrate. Size and number of Pd islands increase with the increase of the deposition time, and consequently surface coverage increases too. Deposited Pd was also identified by the changes in cyclic voltammetry (CV) profiles from which an active surface area was estimated. Obtained Pd/Au(poly) surfaces have shown a significant catalytic activity towards oxygen reduction reaction which increases with the increase of Pd islands coverage. The initial potential of ORR was shifted positively, while reaction pathway changes from 2e-reduction on pure gold to 4e-reduction on Pd modified gold. Additionally, obtained Pd/Au(poly) surfaces have shown a significant activity towards hydrogen peroxide reduction (HPRR), which appear as an intermediate during ORR. This supports the assumption that ORR on Pd/Au(poly) occurs partly through 4e-series reduction pathway, the fraction of which increases with the increase of Pd coverage. PB - Oxford : Pergamon-Elsevier Science Ltd T2 - Electrochimica Acta T1 - Catalysis of oxygen reduction on Au modified by Pd nanoislands in perchloric acid solution VL - 64 SP - 140 EP - 146 DO - 10.1016/j.electacta.2011.12.130 ER -
@article{ author = "Srejić, Irina and Smiljanić, Milutin and Grgur, Branimir N. and Rakočević, Zlatko Lj. and Štrbac, Svetlana", year = "2012", abstract = "Oxygen reduction reaction (ORR) was studied on polycrystalline gold, Au(poly), modified by nanosized palladium islands in 0.1 M HClO4 solution using rotating disc electrode technique. Paladium was spontaneously deposited from 1 mM PdSO4 center dot 2H(2)O + 0.5 M H2SO4 solution for various deposition times at a submonolayer coverage. Topography of obtained Pd/Au(poly) surfaces was observed by tapping mode atomic force microscopy (AFM), while chemical surface composition changes were detected by simultaneously performed phase AFM. Deposited Pd islands were nonuniform in size and randomly distributed over the gold substrate. Size and number of Pd islands increase with the increase of the deposition time, and consequently surface coverage increases too. Deposited Pd was also identified by the changes in cyclic voltammetry (CV) profiles from which an active surface area was estimated. Obtained Pd/Au(poly) surfaces have shown a significant catalytic activity towards oxygen reduction reaction which increases with the increase of Pd islands coverage. The initial potential of ORR was shifted positively, while reaction pathway changes from 2e-reduction on pure gold to 4e-reduction on Pd modified gold. Additionally, obtained Pd/Au(poly) surfaces have shown a significant activity towards hydrogen peroxide reduction (HPRR), which appear as an intermediate during ORR. This supports the assumption that ORR on Pd/Au(poly) occurs partly through 4e-series reduction pathway, the fraction of which increases with the increase of Pd coverage.", publisher = "Oxford : Pergamon-Elsevier Science Ltd", journal = "Electrochimica Acta", title = "Catalysis of oxygen reduction on Au modified by Pd nanoislands in perchloric acid solution", volume = "64", pages = "140-146", doi = "10.1016/j.electacta.2011.12.130" }
Srejić, I., Smiljanić, M., Grgur, B. N., Rakočević, Z. Lj.,& Štrbac, S.. (2012). Catalysis of oxygen reduction on Au modified by Pd nanoislands in perchloric acid solution. in Electrochimica Acta Oxford : Pergamon-Elsevier Science Ltd., 64, 140-146. https://doi.org/10.1016/j.electacta.2011.12.130
Srejić I, Smiljanić M, Grgur BN, Rakočević ZL, Štrbac S. Catalysis of oxygen reduction on Au modified by Pd nanoislands in perchloric acid solution. in Electrochimica Acta. 2012;64:140-146. doi:10.1016/j.electacta.2011.12.130 .
Srejić, Irina, Smiljanić, Milutin, Grgur, Branimir N., Rakočević, Zlatko Lj., Štrbac, Svetlana, "Catalysis of oxygen reduction on Au modified by Pd nanoislands in perchloric acid solution" in Electrochimica Acta, 64 (2012):140-146, https://doi.org/10.1016/j.electacta.2011.12.130 . .