Nano titanium oxide catalyst support for proton exchange membrane fuel cells

Rajalakshmi, N.; Lakshmi, N.; Dhathathreyan, K. S.

doi:10.1016/j.ijhydene.2008.09.032

Cited by 131 publications

(84 citation statements)

References 22 publications

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“…The stabilizing ability of TiO 2 used as a support for Pt is well reported in the literature. It has been shown [69] that the role of TiO 2 is (i) to avoid the agglomeration of Pt particles, (ii) to help in controlling the nanostructure of the catalyst and (iii) to provide thermal and redox stability.…”

Section: Optimization Of the Preparation Of The 50ti 07 W 03 O 2 -5mentioning

confidence: 99%

Preparation and characterization of novel Ti0.7W0.3O2–C composite materials for Pt-based anode electrocatalysts with enhanced CO tolerance

Gubán

Borbáth

Pászti

et al. 2015

Applied Catalysis B: Environmental

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Ti-based electroconductive mixed oxides were deposited onto activated carbon by using three different sol-gel-based multistep synthesis routes. As demonstrated by X-ray diffraction, high crystallinity of the tungsten-loaded rutile was achieved by a sequence of annealing in inert atmosphere at 750°C and a short reductive treatment at 650°C.Formation of the rutile phase on the carbon support before the high temperature treatment has been proved to be the prerequisite for complete W incorporation into the rutile lattice. The structural and compositional properties of the mixed oxides were explored by transmission electron microscopy, temperature programmed reduction and X-ray photoelectron spectroscopy. Anode electrocatalysts were formulated by loading the composite of the activated carbon and the Ti-based electroconductive mixed oxides with 40 wt% Pt. Enhanced CO tolerance along with considerable stability was demonstrated for the electrocatalyst prepared using the Ti 0.7 W 0.3 O 2 -C composite material with high degree of W incorporation.

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Section: Optimization Of the Preparation Of The 50ti 07 W 03 O 2 -5mentioning

confidence: 99%

Preparation and characterization of novel Ti0.7W0.3O2–C composite materials for Pt-based anode electrocatalysts with enhanced CO tolerance

Gubán

Borbáth

Pászti

et al. 2015

Applied Catalysis B: Environmental

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“…Alternative support materials (i.e., conductive ceramics, such as titanium, tungsten and zirconium oxides) with dimensions in the nanometer range were proposed in the literature [7]. For example, TiO 2 nanoparticles were synthesized by a sol-gel method and then platinized [8]. The TiO 2 supported catalyst showed similar performance compared to carbon supported Pt in a H 2 PEM fuel cell when operated at 60 • C and 0.8 V. However, in the Ohmic regime the application of the ceramic support yielded lower performance due to its higher electrical resistance.…”

Section: Introductionmentioning

confidence: 99%

Pt nanoparticles deposited on TiO2 based nanofibers: Electrochemical stability and oxygen reduction activity

Bauer

Lee

Song

et al. 2010

Journal of Power Sources

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. The electrochemical stability of Pt deposited on TiO 2 based nanofibers was compared with commercially available carbon supported Pt. Prior to the Pt deposition the TiO 2 material, which was either undoped or Nb doped, was air calcined. In one case the undoped TiO 2 was also reduced in a hydrogen atmosphere. XRD analysis revealed that the unreduced TiO 2 was present in the anatase phase, irrespective of whether the Nb dopant was present, whereas the rutile phase was formed due to reduction with H 2 . The diameter of the TiO 2 fibers varied from 50 to 100 nm, and the average Pt particle diameter was approximately 5 nm. Pt supported on TiO 2 was more stable than Pt supported on C when subjected to 1000 voltammetric cycles in the range of 0.05-1.3 V vs. RHE. Nb doped TiO 2 showed the highest stability, retaining 60% of the electrochemically active surface area after 1000 cycles compared to the state after 100 cycles, whereas the carbon supported catalyst retained 20% of the active surface area. The commercial catalyst had the highest oxygen reduction activity due to its larger specific area (17.1 m 2 g −1 vs. 5.0 m 2 g −1 for Pt/TiO 2 -Nb, measured after 100 cycles) and the higher support conductivity. The Pt supported on Nb doped or on H 2 reduced TiO 2 was more active than Pt supported on air calcined and otherwise unmodified TiO 2 .Crown

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“…It is therefore important to explore alternative materials that can provide improved stability compared to carbon. Several research groups investigated titanium, tungsten and zirconium oxide supports with size features in the nanometer range [12][13][14][15][16][17][18]. Recent results in our group showed that Pt supported on titanium dioxide nanofibers is more stable compared to conventional carbon black [18].…”

Section: Introductionmentioning

confidence: 90%

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

Bauer

Song

Ignaszak

et al. 2010

Electrochimica Acta

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The electrochemical stability of Pt deposited on mesoporous carbon, which was either applied in its unmodified state or coated with 20 wt% TiO 2 , was investigated by cyclic voltammetry in N 2 purged 0.5 M sulfuric acid. XRD analysis revealed that TiO 2 was present in the anatase phase. The mean Pt particle diameter was ∼6 and ∼4 nm for mesoporous carbon with and without TiO 2 , respectively. Pt supported on TiO 2 modified substrates was more stable than Pt supported on conventional mesoporous carbon when subjected to 1000 cycles in the potential range from 0.05 to 1.25 V vs. RHE. This was evident from the observation that the support with TiO 2 retained ∼53% of the electrochemically active surface area relative to the state observed after 100 cycles, whereas ∼33% of the active area remained in the case without TiO 2 . The oxygen reduction mass activity was identical for both fresh samples (i.e., 18 A g −1 Pt). After 1000 cycles the mass activity decreased to 10 A g −1 Pt for the case without TiO 2 , whereas with TiO 2 the deactivation was minor; i.e., the mass activity after 1000 cycles was 17 A g .

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Nano titanium oxide catalyst support for proton exchange membrane fuel cells

Cited by 131 publications

References 22 publications

Preparation and characterization of novel Ti0.7W0.3O2–C composite materials for Pt-based anode electrocatalysts with enhanced CO tolerance

Preparation and characterization of novel Ti0.7W0.3O2–C composite materials for Pt-based anode electrocatalysts with enhanced CO tolerance

Pt nanoparticles deposited on TiO2 based nanofibers: Electrochemical stability and oxygen reduction activity

Improved stability of mesoporous carbon fuel cell catalyst support through incorporation of TiO2

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