Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction
Апстракт
The oxygen reduction reaction (ORR) was studied at carbon supported MoOx-Pt/C and TiOx-Pt nanocatalysts in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The MoOx-Pt/C and TiOx-Pt/C catalysts were prepared by the polyole method combined by MoOx or TiOx post-deposition. Home made catalysts were characterized by TEM and EDX techniques. It was found that catalyst nanoparticles were homogenously distributed over the carbon support with a mean particle size about 2.5 nm. Quite similar distribution and particle size was previously obtained for Pt/C catalyst. Results confirmed that MoOx and TiOx post-deposition did not lead to a significant growth of the Pt nanoparticles. The ORR kinetics was investigated by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. These results showed the existence of two E - logj regions, usually observed with polycrystalline Pt in acid solution. It was proposed that the main path in the ORR mechanism on MoOx-Pt/C and TiOx-Pt/C cataly...sts was the direct four-electron process with the transfer of the first electron as the rate-determining step. The increase in catalytic activity for ORR on MoOx-Pt/C and TiOx-Pt/C catalysts, in comparison with Pt/C catalyst, was explained by synergetic effects due to the formation of the interface between the platinum and oxide materials and by spillover due to the surface diffusion of oxygen reaction intermediates. (C) 2008 Elsevier Ltd. All rights reserved.
Кључне речи:
Oxygen reduction reaction / MoOx-Pt/C catalyst / TiOx-Pt/C catalyst / Nanoparticles / Acid solutionИзвор:
Electrochimica Acta, 2009, 54, 9, 2404-2409Напомена:
- Euro-Interfinish 2007 Conference, Oct 18-19, 2007, Athens, Greece
DOI: 10.1016/j.electacta.2008.03.015
ISSN: 0013-4686
WoS: 000264743900002
Scopus: 2-s2.0-61449084812
Колекције
Институција/група
VinčaTY - JOUR AU - Elezovic, N. R. AU - Babić, Biljana M. AU - Radmilovíć, Velimir R. AU - Vracar, Lj. M. AU - Krstajic, N. V. PY - 2009 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6791 AB - The oxygen reduction reaction (ORR) was studied at carbon supported MoOx-Pt/C and TiOx-Pt nanocatalysts in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The MoOx-Pt/C and TiOx-Pt/C catalysts were prepared by the polyole method combined by MoOx or TiOx post-deposition. Home made catalysts were characterized by TEM and EDX techniques. It was found that catalyst nanoparticles were homogenously distributed over the carbon support with a mean particle size about 2.5 nm. Quite similar distribution and particle size was previously obtained for Pt/C catalyst. Results confirmed that MoOx and TiOx post-deposition did not lead to a significant growth of the Pt nanoparticles. The ORR kinetics was investigated by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. These results showed the existence of two E - logj regions, usually observed with polycrystalline Pt in acid solution. It was proposed that the main path in the ORR mechanism on MoOx-Pt/C and TiOx-Pt/C catalysts was the direct four-electron process with the transfer of the first electron as the rate-determining step. The increase in catalytic activity for ORR on MoOx-Pt/C and TiOx-Pt/C catalysts, in comparison with Pt/C catalyst, was explained by synergetic effects due to the formation of the interface between the platinum and oxide materials and by spillover due to the surface diffusion of oxygen reaction intermediates. (C) 2008 Elsevier Ltd. All rights reserved. T2 - Electrochimica Acta T1 - Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction VL - 54 IS - 9 SP - 2404 EP - 2409 DO - 10.1016/j.electacta.2008.03.015 ER -
@article{ author = "Elezovic, N. R. and Babić, Biljana M. and Radmilovíć, Velimir R. and Vracar, Lj. M. and Krstajic, N. V.", year = "2009", abstract = "The oxygen reduction reaction (ORR) was studied at carbon supported MoOx-Pt/C and TiOx-Pt nanocatalysts in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The MoOx-Pt/C and TiOx-Pt/C catalysts were prepared by the polyole method combined by MoOx or TiOx post-deposition. Home made catalysts were characterized by TEM and EDX techniques. It was found that catalyst nanoparticles were homogenously distributed over the carbon support with a mean particle size about 2.5 nm. Quite similar distribution and particle size was previously obtained for Pt/C catalyst. Results confirmed that MoOx and TiOx post-deposition did not lead to a significant growth of the Pt nanoparticles. The ORR kinetics was investigated by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. These results showed the existence of two E - logj regions, usually observed with polycrystalline Pt in acid solution. It was proposed that the main path in the ORR mechanism on MoOx-Pt/C and TiOx-Pt/C catalysts was the direct four-electron process with the transfer of the first electron as the rate-determining step. The increase in catalytic activity for ORR on MoOx-Pt/C and TiOx-Pt/C catalysts, in comparison with Pt/C catalyst, was explained by synergetic effects due to the formation of the interface between the platinum and oxide materials and by spillover due to the surface diffusion of oxygen reaction intermediates. (C) 2008 Elsevier Ltd. All rights reserved.", journal = "Electrochimica Acta", title = "Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction", volume = "54", number = "9", pages = "2404-2409", doi = "10.1016/j.electacta.2008.03.015" }
Elezovic, N. R., Babić, B. M., Radmilovíć, V. R., Vracar, Lj. M.,& Krstajic, N. V.. (2009). Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction. in Electrochimica Acta, 54(9), 2404-2409. https://doi.org/10.1016/j.electacta.2008.03.015
Elezovic NR, Babić BM, Radmilovíć VR, Vracar LM, Krstajic NV. Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction. in Electrochimica Acta. 2009;54(9):2404-2409. doi:10.1016/j.electacta.2008.03.015 .
Elezovic, N. R., Babić, Biljana M., Radmilovíć, Velimir R., Vracar, Lj. M., Krstajic, N. V., "Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction" in Electrochimica Acta, 54, no. 9 (2009):2404-2409, https://doi.org/10.1016/j.electacta.2008.03.015 . .