A detrimental effect of CO on the stability of Pt nanoparticles, which is important for fuel cells technology, is demonstrated by the change in HCOOH kinetics on Pt nanoparticles caused by the presence of CO in the electrolyte. Pt nanoparticles supported on high area carbon (Pt/C) were applied on gold and glassy carbon substrates (Pt/C"Au and Pt/C"GC) and three different kinds of Pt surface were prepared by potential cycling in the various potential limits in N-2 and CO saturated electrolyte: untreated, OH-annealed and CO-annealed. On untreated Pt/C"Au catalyst HCOOH is oxidized predominantly through indirect mechanism, after OH-annealing direct path is slightly accelerated, but on CO-annealed catalyst the direct path in HCOOH oxidation is predominant. Based on the fact that more contiguous Pt sites are necessary for indirect than for direct path, it was concluded that OH- and especially CO-annealing of Pt/C produces small Pt domains. Since the same pretreatment did not show any effect... on HCOOH oxidation on Pt/C"GC electrode, it was postulated that Pt nanoparticles dissolve in the presence of CO on the surface and in the electrolyte, and successively deposit on Au substrate. The results points out pronounced instability of Pt nanoparticles in the presence of CO.
TY - JOUR
AU - Obradović, Maja
AU - Gojković, Snežana Lj.
PY - 2012
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2232
AB - A detrimental effect of CO on the stability of Pt nanoparticles, which is important for fuel cells technology, is demonstrated by the change in HCOOH kinetics on Pt nanoparticles caused by the presence of CO in the electrolyte. Pt nanoparticles supported on high area carbon (Pt/C) were applied on gold and glassy carbon substrates (Pt/C"Au and Pt/C"GC) and three different kinds of Pt surface were prepared by potential cycling in the various potential limits in N-2 and CO saturated electrolyte: untreated, OH-annealed and CO-annealed. On untreated Pt/C"Au catalyst HCOOH is oxidized predominantly through indirect mechanism, after OH-annealing direct path is slightly accelerated, but on CO-annealed catalyst the direct path in HCOOH oxidation is predominant. Based on the fact that more contiguous Pt sites are necessary for indirect than for direct path, it was concluded that OH- and especially CO-annealing of Pt/C produces small Pt domains. Since the same pretreatment did not show any effect on HCOOH oxidation on Pt/C"GC electrode, it was postulated that Pt nanoparticles dissolve in the presence of CO on the surface and in the electrolyte, and successively deposit on Au substrate. The results points out pronounced instability of Pt nanoparticles in the presence of CO.
PB - Elsevier Science Sa, Lausanne
T2 - Journal of Electroanalytical Chemistry
T1 - Electrochemical instability of Pt nanoparticles probed by formic acid oxidation
EP - 155
SP - 152
VL - 664
DO - 10.1016/j.jelechem.2011.10.016
ER -
@article{
author = "Obradović, Maja and Gojković, Snežana Lj.",
year = "2012",
abstract = "A detrimental effect of CO on the stability of Pt nanoparticles, which is important for fuel cells technology, is demonstrated by the change in HCOOH kinetics on Pt nanoparticles caused by the presence of CO in the electrolyte. Pt nanoparticles supported on high area carbon (Pt/C) were applied on gold and glassy carbon substrates (Pt/C"Au and Pt/C"GC) and three different kinds of Pt surface were prepared by potential cycling in the various potential limits in N-2 and CO saturated electrolyte: untreated, OH-annealed and CO-annealed. On untreated Pt/C"Au catalyst HCOOH is oxidized predominantly through indirect mechanism, after OH-annealing direct path is slightly accelerated, but on CO-annealed catalyst the direct path in HCOOH oxidation is predominant. Based on the fact that more contiguous Pt sites are necessary for indirect than for direct path, it was concluded that OH- and especially CO-annealing of Pt/C produces small Pt domains. Since the same pretreatment did not show any effect on HCOOH oxidation on Pt/C"GC electrode, it was postulated that Pt nanoparticles dissolve in the presence of CO on the surface and in the electrolyte, and successively deposit on Au substrate. The results points out pronounced instability of Pt nanoparticles in the presence of CO.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Electrochemical instability of Pt nanoparticles probed by formic acid oxidation",
pages = "155-152",
volume = "664",
doi = "10.1016/j.jelechem.2011.10.016"
}
Obradović, M.,& Gojković, S. Lj.. (2012). Electrochemical instability of Pt nanoparticles probed by formic acid oxidation. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 664, 152-155.
https://doi.org/10.1016/j.jelechem.2011.10.016
Obradović M, Gojković SL. Electrochemical instability of Pt nanoparticles probed by formic acid oxidation. in Journal of Electroanalytical Chemistry. 2012;664:152-155.
doi:10.1016/j.jelechem.2011.10.016 .
Obradović, Maja, Gojković, Snežana Lj., "Electrochemical instability of Pt nanoparticles probed by formic acid oxidation" in Journal of Electroanalytical Chemistry, 664 (2012):152-155,
https://doi.org/10.1016/j.jelechem.2011.10.016 . .
