Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions
Апстракт
Platinum based nanocatalyst at home made Nb-TiO2 support was synthesized and characterized as the catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH, at 25 degrees C. Nb doped TiO2 catalyst support, containing 5% of Nb, has been synthesized by modified acid-catalyzed sol-gel procedure in non-aqueous medium. BET and X-ray diffraction (XRD) techniques were applied for characterization of synthesized supporting material. XRD analysis revealed only presence of anatase TiO2 phase in synthesized support powder. Existence of any peaks belonging to Nb compounds has not been observed, indicating Nb incorporated into the lattice. Nb-TiO2 supported Pt nanocatalyst synthesized, using borohydride reduction method, was characterized by TEM and HRTEM techniques. Platinum nanoparticles distribution, over Nb doped TiO2 support, was quite homogenous. Mean particle size of about 4 nm was found with no pronounced particle agglomeration. Electrochemical techniques: cyclic voltammetry and linear ...sweep voltammetry at rotating disc electrode were applied in order to study kinetics and estimate catalytic activity of this new catalyst for the oxygen reduction reaction in alkaline solution. Two different Tafel slopes were found: one close to -90 mV dec(-1) in low current density region and other approximately 200 my dec(-1) in high current density region, which is in good accordance with literature results for oxygen reduction at Pt single crystals, as well as Pt nanocatalysts in alkaline solutions. Similar specific catalytic activity (expressed in term of kinetic current density per real surface area) of Nb(5%)-TiO2/Pt catalyst for oxygen reduction reaction in comparison with the carbon supported platinum (Vulcan/Pt) nanocatalyst, was found. (C) 2011 Published by Elsevier Ltd.
Кључне речи:
Nb-TiO2 support / Nb-TiO2/Pt catalyst / Pt nanoparticles / Oxygen reduction reaction / Alkaline solutionsИзвор:
Electrochimica Acta, 2011, 56, 25, 9020-9026Финансирање / пројекти:
- Развој, карактеризација и примена наноструктуираних композитних катализатора и интерактивних носача у горивним спреговима и електролизи воде (RS-MESTD-Basic Research (BR or ON)-172054)
DOI: 10.1016/j.electacta.2011.04.075
ISSN: 0013-4686
WoS: 000295997000002
Scopus: 2-s2.0-80053257093
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 - 2011 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4526 AB - Platinum based nanocatalyst at home made Nb-TiO2 support was synthesized and characterized as the catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH, at 25 degrees C. Nb doped TiO2 catalyst support, containing 5% of Nb, has been synthesized by modified acid-catalyzed sol-gel procedure in non-aqueous medium. BET and X-ray diffraction (XRD) techniques were applied for characterization of synthesized supporting material. XRD analysis revealed only presence of anatase TiO2 phase in synthesized support powder. Existence of any peaks belonging to Nb compounds has not been observed, indicating Nb incorporated into the lattice. Nb-TiO2 supported Pt nanocatalyst synthesized, using borohydride reduction method, was characterized by TEM and HRTEM techniques. Platinum nanoparticles distribution, over Nb doped TiO2 support, was quite homogenous. Mean particle size of about 4 nm was found with no pronounced particle agglomeration. Electrochemical techniques: cyclic voltammetry and linear sweep voltammetry at rotating disc electrode were applied in order to study kinetics and estimate catalytic activity of this new catalyst for the oxygen reduction reaction in alkaline solution. Two different Tafel slopes were found: one close to -90 mV dec(-1) in low current density region and other approximately 200 my dec(-1) in high current density region, which is in good accordance with literature results for oxygen reduction at Pt single crystals, as well as Pt nanocatalysts in alkaline solutions. Similar specific catalytic activity (expressed in term of kinetic current density per real surface area) of Nb(5%)-TiO2/Pt catalyst for oxygen reduction reaction in comparison with the carbon supported platinum (Vulcan/Pt) nanocatalyst, was found. (C) 2011 Published by Elsevier Ltd. T2 - Electrochimica Acta T1 - Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions VL - 56 IS - 25 SP - 9020 EP - 9026 DO - 10.1016/j.electacta.2011.04.075 ER -
@article{ author = "Elezovic, N. R. and Babić, Biljana M. and Radmilovíć, Velimir R. and Vracar, Lj. M. and Krstajic, N. V.", year = "2011", abstract = "Platinum based nanocatalyst at home made Nb-TiO2 support was synthesized and characterized as the catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH, at 25 degrees C. Nb doped TiO2 catalyst support, containing 5% of Nb, has been synthesized by modified acid-catalyzed sol-gel procedure in non-aqueous medium. BET and X-ray diffraction (XRD) techniques were applied for characterization of synthesized supporting material. XRD analysis revealed only presence of anatase TiO2 phase in synthesized support powder. Existence of any peaks belonging to Nb compounds has not been observed, indicating Nb incorporated into the lattice. Nb-TiO2 supported Pt nanocatalyst synthesized, using borohydride reduction method, was characterized by TEM and HRTEM techniques. Platinum nanoparticles distribution, over Nb doped TiO2 support, was quite homogenous. Mean particle size of about 4 nm was found with no pronounced particle agglomeration. Electrochemical techniques: cyclic voltammetry and linear sweep voltammetry at rotating disc electrode were applied in order to study kinetics and estimate catalytic activity of this new catalyst for the oxygen reduction reaction in alkaline solution. Two different Tafel slopes were found: one close to -90 mV dec(-1) in low current density region and other approximately 200 my dec(-1) in high current density region, which is in good accordance with literature results for oxygen reduction at Pt single crystals, as well as Pt nanocatalysts in alkaline solutions. Similar specific catalytic activity (expressed in term of kinetic current density per real surface area) of Nb(5%)-TiO2/Pt catalyst for oxygen reduction reaction in comparison with the carbon supported platinum (Vulcan/Pt) nanocatalyst, was found. (C) 2011 Published by Elsevier Ltd.", journal = "Electrochimica Acta", title = "Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions", volume = "56", number = "25", pages = "9020-9026", doi = "10.1016/j.electacta.2011.04.075" }
Elezovic, N. R., Babić, B. M., Radmilovíć, V. R., Vracar, Lj. M.,& Krstajic, N. V.. (2011). Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions. in Electrochimica Acta, 56(25), 9020-9026. https://doi.org/10.1016/j.electacta.2011.04.075
Elezovic NR, Babić BM, Radmilovíć VR, Vracar LM, Krstajic NV. Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions. in Electrochimica Acta. 2011;56(25):9020-9026. doi:10.1016/j.electacta.2011.04.075 .
Elezovic, N. R., Babić, Biljana M., Radmilovíć, Velimir R., Vracar, Lj. M., Krstajic, N. V., "Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions" in Electrochimica Acta, 56, no. 25 (2011):9020-9026, https://doi.org/10.1016/j.electacta.2011.04.075 . .