Hydrogen sensing characteristics of Pt/TiO 2 /MWCNTs composites

Luca, Lidia De; Donato, Andrea; Santangelo, S.; Faggio, G.; Messina, G.; Donato, Nicola; Neri, G.

doi:10.1016/j.ijhydene.2011.10.017

Cited by 70 publications

(29 citation statements)

References 31 publications

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“…Thus, TiO 2 nanowires to MWCNTs with C-Ti ratio of 2:1 are found to be optimum for Pt support in PEFCs. This is substantiated in the literature by De Luca et al It is reported that C/Ti ratio in the Pt/TiO2/MWCNT composite plays a vital role in hydrogen detection [36].…”

Section: Resultssupporting

confidence: 73%

“…The unique electronic structure of MWCNTs helps enhancing the catalytic activity of the Pt electrocatalyst in addition to its enhanced ballistic electron transport. Besides, the titania nanowires show enhanced electrocatalytic activity by their interaction with Pt nanoparticles [36,48,51]. Together, the combination of titania nanowires along with MWCNTs enhanced the catalytic activity of Pt through their interaction and improved the fuel cell performance.…”

Section: Resultsmentioning

confidence: 99%

“…Shen et al investigated TiO 2 /MWCNTs based nanocomposites for usage in lithium-ion battery and this nanocomposite seems to be ideal for fast and efficient lithium storage [35]. De Luca et al have explored the sensing characteristics of Pt/TiO 2 /MWCNTs composites and found that the synergistic action between Pt, TiO 2 and MWCNTs plays a key role in fast response of this catalyst for hydrogen sensing [36].…”

Section: Introductionmentioning

confidence: 99%

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TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Selvaganesh¹,

Dhanasekaran²,

Bhat³

2017

Electrochemical Energy Technology

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Durability is a major issue and has been the growing focus of research for the commercialization of polymer electrolyte fuel cells (PEFCs). Corrosion of carbon support is a key parameter as it triggers the Pt catalyst degradation and affects cell performance, which in turn affects the longevity of the cells. Herein, we describe a hybrid composite support of TiO 2 -nanowires and Multiwalled carbon nanotubes (MWCNTs) that offers resistance to corrosion under stressful operating conditions. Titania nanowires which have been shown to be more efficient and catalytically active than spherically shaped TiO 2 . TiO 2 -MWCNT composites are prepared through a hydrothermal method, followed by Pt deposition using a polyol method. Crystal structure, morphology, and oxidation state are examined through various characterization techniques. Electrochemical performance of TiO 2 -nanowire/MWCNT composite-supported Pt at various ratios of TiO 2 /MWCNT is assessed in PEFCs. Pt on support with optimum composition of TiO 2 -nanowires to MWCNTs exhibits fuel cell performance superior to Pt on MWCNTs. Accelerated stress testing (AST) between 1 and 1.5 V reveals that the designed catalyst on nanocomposite support possesses superior electrochemical activity and shows only 16% loss in catalytic activity in relation to 35% for Pt/MWCNTs even after 6000 potential cycles. Subsequently, the samples were characterized after AST to correlate the loss in fuel cell performance

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Selvaganesh¹,

Dhanasekaran²,

Bhat³

2017

Electrochemical Energy Technology

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show abstract

“…At the later stages of the experiments (t [ 50 min), the steady state H 2 evolution rates were nearly identical. A possible explanation of the phenomenon can be that in the first period of irradiation, the hydrogen generation is regulated by the varying potential of H-electrode established by the dissolution of hydrogen in Pt [31]. At higher carrier gas flow rates, this process is limited.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic H2 generation on noble metal modified TiO2 catalysts excited with visible light irradiation

Kmetykó

Szániel

Tsakiroglou

et al. 2015

Reac Kinet Mech Cat

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Photocatalysts were prepared by the deposition of noble metal nanoparticles (Au, Pt, Rh or Ru) on different commercially available titanias. The photocatalytic performance of these catalysts was studied for the evolution of H 2 during excitation with visible light. Experiments were carried out in irradiated suspensions containing various organic compounds. Noble metal nanoparticles can promote the lowering of the overvoltage of H ? reduction. The noble metal nanoparticles were deposited onto the TiO 2 surface by in situ chemical reduction in a quantity of 1 wt%. Three aspects were considered: (i) the photocatalytic performance of different bare TiO 2 deposited with Pt; (ii) the effect of the deposition of Au, Pt, Rh or Ru nanoparticles onto the TiO 2 surface; and (iii) choosing the most suitable H 2 production supporting organic compound. The rate of H 2 evolution proved to be strongly dependent on the quality of TiO 2 powder and the presence of different organics. The applied noble metal was also an efficiency determining factor during these photocatalytic reactions. With the best combination of the above mentioned circumstances, we achieved promising results to be able to effectively harvest the energy of sunlight.

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“…We thus find the value of K s is 11.36 for the PdeSiO 2 resistive-type sensor while it is 13.59 for the pure-Pd one. Furthermore, monitoring of high hydrogen concentrations in nitrogen is very important in fuel cell applications [26]. The pure-Pd resistive-type sensor can generally give good hydrogen sensitivity only at low concentrations [20].…”

mentioning

confidence: 99%

Sensing properties of resistive-type hydrogen sensors with a Pd–SiO2 thin-film mixture

Tan

Wei

et al. 2013

International Journal of Hydrogen Energy

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Hydrogen sensing characteristics of Pt/TiO 2 /MWCNTs composites

Cited by 70 publications

References 31 publications

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Enhanced photocatalytic H2 generation on noble metal modified TiO2 catalysts excited with visible light irradiation

Sensing properties of resistive-type hydrogen sensors with a Pd–SiO2 thin-film mixture

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