Ministry of Science and Technological Development, Republic of Serbia [142038], US Department of Energy [DE-AC02-05CH11231]

Link to this page

Ministry of Science and Technological Development, Republic of Serbia [142038], US Department of Energy [DE-AC02-05CH11231]

Authors

Publications

Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction

Elezovic, N. R.; Babić, Biljana M.; Gajic-Krstajic, Lj.; Radmilovic, V.; Krstajic, N. V.; Vracar, L. J.

(2010)

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Gajic-Krstajic, Lj.
AU  - Radmilovic, V.
AU  - Krstajic, N. V.
AU  - Vracar, L. J.
PY  - 2010
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/3980
AB  - In order to point out the effect of the support to the catalyst for oxygen reduction reaction nano-crystalline Nb-doped TiO2 was synthesized through a modified sol-gel route procedure. The specific surface area of the support, S-BET, and pore size distribution, were calculated from the adsorption isotherms using the gravimetric McBain method. The support was characterized by X-ray diffraction (XRD) technique. The borohydride reduction method was used to prepare Nb-TiO2 supported Pt (20 wt.%) catalyst. The synthesized catalyst was analyzed by TEM technique. Finally, the catalytic activity of this new catalyst for oxygen reduction reaction was investigated in acid solution, in the absence and the presence of methanol, and its activity was compared towards the results on C/Pt catalysts. Kinetic analysis reveals that the oxygen reduction reaction on Nb-TiO2/Pt catalyst follows four-electron process leading to water, as in the case of C/Pt electrode, but the Tafel plots normalized to the electrochemically active surface area show very remarkable enhancement in activity of Nb-TiO2/Pt expressed through the value of the current density at the constant potential. Moreover, Nb-TiO2/Pt catalyst exhibits higher methanol tolerance during the oxygen reduction reaction than the C/Pt catalyst. The enhancement in the activity of Nb-TiO2/Pt is consequence of both: the interactions of Pt nanoparticles with the support and the energy shift of the surface d-states with respect to the Fermi level what changes the surface reactivity. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Power Sources
T1  - Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction
VL  - 195
IS  - 13
SP  - 3961
EP  - 3968
DO  - 10.1016/j.jpowsour.2010.01.035
ER  - 
@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Gajic-Krstajic, Lj. and Radmilovic, V. and Krstajic, N. V. and Vracar, L. J.",
year = "2010",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/3980",
abstract = "In order to point out the effect of the support to the catalyst for oxygen reduction reaction nano-crystalline Nb-doped TiO2 was synthesized through a modified sol-gel route procedure. The specific surface area of the support, S-BET, and pore size distribution, were calculated from the adsorption isotherms using the gravimetric McBain method. The support was characterized by X-ray diffraction (XRD) technique. The borohydride reduction method was used to prepare Nb-TiO2 supported Pt (20 wt.%) catalyst. The synthesized catalyst was analyzed by TEM technique. Finally, the catalytic activity of this new catalyst for oxygen reduction reaction was investigated in acid solution, in the absence and the presence of methanol, and its activity was compared towards the results on C/Pt catalysts. Kinetic analysis reveals that the oxygen reduction reaction on Nb-TiO2/Pt catalyst follows four-electron process leading to water, as in the case of C/Pt electrode, but the Tafel plots normalized to the electrochemically active surface area show very remarkable enhancement in activity of Nb-TiO2/Pt expressed through the value of the current density at the constant potential. Moreover, Nb-TiO2/Pt catalyst exhibits higher methanol tolerance during the oxygen reduction reaction than the C/Pt catalyst. The enhancement in the activity of Nb-TiO2/Pt is consequence of both: the interactions of Pt nanoparticles with the support and the energy shift of the surface d-states with respect to the Fermi level what changes the surface reactivity. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Power Sources",
title = "Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction",
volume = "195",
number = "13",
pages = "3961-3968",
doi = "10.1016/j.jpowsour.2010.01.035"
}
Elezovic, N. R., Babić, B. M., Gajic-Krstajic, Lj., Radmilovic, V., Krstajic, N. V.,& Vracar, L. J. (2010). Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction.
Journal of Power Sources, 195(13), 3961-3968.
https://doi.org/10.1016/j.jpowsour.2010.01.035
Elezovic NR, Babić BM, Gajic-Krstajic L, Radmilovic V, Krstajic NV, Vracar LJ. Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction. Journal of Power Sources. 2010;195(13):3961-3968
Elezovic N. R., Babić Biljana M., Gajic-Krstajic Lj., Radmilovic V., Krstajic N. V., Vracar L. J., "Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction" Journal of Power Sources, 195, no. 13 (2010):3961-3968,
https://doi.org/10.1016/j.jpowsour.2010.01.035 .
3
62
59
65

Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution

Babić, Biljana M.; Gulicovski, Jelena J.; Gajic-Krstajic, Lj.; Elezovic, N.; Radmilovic, V. R.; Krstajic, N. V.; Vracar, Lj. M.

(2009)

TY  - JOUR
AU  - Babić, Biljana M.
AU  - Gulicovski, Jelena J.
AU  - Gajic-Krstajic, Lj.
AU  - Elezovic, N.
AU  - Radmilovic, V. R.
AU  - Krstajic, N. V.
AU  - Vracar, Lj. M.
PY  - 2009
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/3731
AB  - The kinetics and mechanism of the hydrogen oxidation reaction were studied in 0.5 mol dm(-3) HClO(4) solution on an electrode based on titanium oxide with Magneli phase structure-supported platinum electrocatalyst applied on rotation Au disk electrode. Pt catalyst was prepared by impregnation method from 2-propanol solution of Pt(NH(3))(2)(NO(2))(2) and sub-stoichiometric titanium oxide powder. Sub-stiochiometric titanium oxide Support was characterized by X-ray diffraction and BET techniques. The synthesized catalyst was analyzed by TEM technique. Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the hydrogen oxidation current-potential behavior on RDE over the entire potential region. The polarization RIDE curves were fitted with derived polarization equations according to proposed model. The fitting shows that the HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway in the lower potential region, while the Heyrovsky-Volmer (HV) pathway is operative in the higher potential region. It is pointed out that Tafel equation that has been frequently used for the kinetics analysis in the HOR, can not reproduce the polarization curves measured with high mass-transport rates. Polarization measurements on RDE revealed that the Pt catalyst deposited on titanium suboxide support showed equal specific activity for the HOR compared to conventional carbon-supported Pt fuel cell catalyst. (C) 2008 Elsevier B.V. All rights reserved.
T2  - Journal of Power Sources
T1  - Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution
VL  - 193
IS  - 1
SP  - 99
EP  - 106
DO  - 10.1016/j.jpowsour.2008.11.142
ER  - 
@article{
author = "Babić, Biljana M. and Gulicovski, Jelena J. and Gajic-Krstajic, Lj. and Elezovic, N. and Radmilovic, V. R. and Krstajic, N. V. and Vracar, Lj. M.",
year = "2009",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/3731",
abstract = "The kinetics and mechanism of the hydrogen oxidation reaction were studied in 0.5 mol dm(-3) HClO(4) solution on an electrode based on titanium oxide with Magneli phase structure-supported platinum electrocatalyst applied on rotation Au disk electrode. Pt catalyst was prepared by impregnation method from 2-propanol solution of Pt(NH(3))(2)(NO(2))(2) and sub-stoichiometric titanium oxide powder. Sub-stiochiometric titanium oxide Support was characterized by X-ray diffraction and BET techniques. The synthesized catalyst was analyzed by TEM technique. Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the hydrogen oxidation current-potential behavior on RDE over the entire potential region. The polarization RIDE curves were fitted with derived polarization equations according to proposed model. The fitting shows that the HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway in the lower potential region, while the Heyrovsky-Volmer (HV) pathway is operative in the higher potential region. It is pointed out that Tafel equation that has been frequently used for the kinetics analysis in the HOR, can not reproduce the polarization curves measured with high mass-transport rates. Polarization measurements on RDE revealed that the Pt catalyst deposited on titanium suboxide support showed equal specific activity for the HOR compared to conventional carbon-supported Pt fuel cell catalyst. (C) 2008 Elsevier B.V. All rights reserved.",
journal = "Journal of Power Sources",
title = "Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution",
volume = "193",
number = "1",
pages = "99-106",
doi = "10.1016/j.jpowsour.2008.11.142"
}
Babić, B. M., Gulicovski, J. J., Gajic-Krstajic, Lj., Elezovic, N., Radmilovic, V. R., Krstajic, N. V.,& Vracar, Lj. M. (2009). Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution.
Journal of Power Sources, 193(1), 99-106.
https://doi.org/10.1016/j.jpowsour.2008.11.142
Babić BM, Gulicovski JJ, Gajic-Krstajic L, Elezovic N, Radmilovic VR, Krstajic NV, Vracar LM. Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution. Journal of Power Sources. 2009;193(1):99-106
Babić Biljana M., Gulicovski Jelena J., Gajic-Krstajic Lj., Elezovic N., Radmilovic V. R., Krstajic N. V., Vracar Lj. M., "Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution" Journal of Power Sources, 193, no. 1 (2009):99-106,
https://doi.org/10.1016/j.jpowsour.2008.11.142 .
11
12
14