The oxygen reduction reaction was investigated in 0.1 M NaOH solution, on a porous coated electrode formed of Pt particles supported on carbon cryogel. The Pt/C catalyst was characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry techniques. The results demonstrated a successful reduction of Pt to metallic form and homogenous Pt particle size distribution with a mean particle size of about 2.7 nm. The ORR kinetics was investigated by linear sweep polarization at a rotating disc electrode. The results showed the existence of two E - log j regions, usually referred to polycrystalline Pt in acid and alkaline solution. At low Current densities (led), the Tafel slope was found to be close to -2.3RT/F, while at high current densities (bed) it was found to be close to -2x2.3RT/F. It is proposed that the main path in the ORR mechanism on Pt particles was the direct four-electron process, with the transfer of the first electron as the rate det...ermining step. If the activities are expressed through the specific current densities, a small enhancement of the catalytic activity for Pt/C was observed compared to that of polycrystalline Pt. The effect of the Pt particle size on the electrocatalysis of oxygen reduction was ascribed to the predominant (111) facets of the platinum crystallites.
TY - JOUR
AU - Elezovic, N. R.
AU - Babić, Biljana M.
AU - Vracar, L. J. M.
AU - Krstajic, N. V.
PY - 2007
UR - https://vinar.vin.bg.ac.rs/handle/123456789/3227
AB - The oxygen reduction reaction was investigated in 0.1 M NaOH solution, on a porous coated electrode formed of Pt particles supported on carbon cryogel. The Pt/C catalyst was characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry techniques. The results demonstrated a successful reduction of Pt to metallic form and homogenous Pt particle size distribution with a mean particle size of about 2.7 nm. The ORR kinetics was investigated by linear sweep polarization at a rotating disc electrode. The results showed the existence of two E - log j regions, usually referred to polycrystalline Pt in acid and alkaline solution. At low Current densities (led), the Tafel slope was found to be close to -2.3RT/F, while at high current densities (bed) it was found to be close to -2x2.3RT/F. It is proposed that the main path in the ORR mechanism on Pt particles was the direct four-electron process, with the transfer of the first electron as the rate determining step. If the activities are expressed through the specific current densities, a small enhancement of the catalytic activity for Pt/C was observed compared to that of polycrystalline Pt. The effect of the Pt particle size on the electrocatalysis of oxygen reduction was ascribed to the predominant (111) facets of the platinum crystallites.
T2 - Journal of the Serbian Chemical Society
T1 - Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution
VL - 72
IS - 7
SP - 699
EP - 708
DO - 10.2298/JSC0707699E
ER -
@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Vracar, L. J. M. and Krstajic, N. V.",
year = "2007",
abstract = "The oxygen reduction reaction was investigated in 0.1 M NaOH solution, on a porous coated electrode formed of Pt particles supported on carbon cryogel. The Pt/C catalyst was characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry techniques. The results demonstrated a successful reduction of Pt to metallic form and homogenous Pt particle size distribution with a mean particle size of about 2.7 nm. The ORR kinetics was investigated by linear sweep polarization at a rotating disc electrode. The results showed the existence of two E - log j regions, usually referred to polycrystalline Pt in acid and alkaline solution. At low Current densities (led), the Tafel slope was found to be close to -2.3RT/F, while at high current densities (bed) it was found to be close to -2x2.3RT/F. It is proposed that the main path in the ORR mechanism on Pt particles was the direct four-electron process, with the transfer of the first electron as the rate determining step. If the activities are expressed through the specific current densities, a small enhancement of the catalytic activity for Pt/C was observed compared to that of polycrystalline Pt. The effect of the Pt particle size on the electrocatalysis of oxygen reduction was ascribed to the predominant (111) facets of the platinum crystallites.",
journal = "Journal of the Serbian Chemical Society",
title = "Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution",
volume = "72",
number = "7",
pages = "699-708",
doi = "10.2298/JSC0707699E"
}
Elezovic, N. R., Babić, B. M., Vracar, L. J. M.,& Krstajic, N. V.. (2007). Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution. in Journal of the Serbian Chemical Society, 72(7), 699-708.
https://doi.org/10.2298/JSC0707699E
Elezovic NR, Babić BM, Vracar LJM, Krstajic NV. Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution. in Journal of the Serbian Chemical Society. 2007;72(7):699-708.
doi:10.2298/JSC0707699E .
Elezovic, N. R., Babić, Biljana M., Vracar, L. J. M., Krstajic, N. V., "Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution" in Journal of the Serbian Chemical Society, 72, no. 7 (2007):699-708,
https://doi.org/10.2298/JSC0707699E . .
