Hybridized synergy effect among TiO2, Pt and graphite silica on photocatalytic hydrogen production from water–methanol solution

Ikeda, Miyuki; Kusumoto, Yoshihumi; Yohei, Yakushijin; Somekawa, Shouichi; Ngweniform, Pascaline; Ahmmad, Bashir

doi:10.1016/j.catcom.2007.03.015

Cited by 16 publications

(5 citation statements)

References 14 publications

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“…the surface properties and particle size of the catalyst and the reaction temperature. A noteworthy increase in reaction rate is observed in the presence of easily oxidizable organic compounds (especially water-alcohol mixtures) rather than using only pure water [6,8,[20][21][22][23][24][25][26][27]. These electron donors (sacrificial reagents) react irreversibly with the photoinduced holes, resulting in suppressed electron-hole recombination and O 2 /H 2 back-reaction rates.…”

Section: Introductionmentioning

confidence: 92%

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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Section: Introductionmentioning

confidence: 92%

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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“…Therefore, graphite silica was added to a Pt + TiO 2 mixture, obtaining an increase of H 2 productivity by 150%. However, when adding the mineral to an impregnated Pt/TiO 2 sample, the H 2 yield halved [173].…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

Hydrogen Production by Photoreforming of Renewable Substrates

Rossetti

2012

ISRN Chemical Engineering

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This paper focuses on the application of photocatalysis to hydrogen production from organic substrates. This process, usually called photoreforming, makes use of semiconductors to promote redox reactions, namely, the oxidation of organic molecules and the reduction of H + to H 2 . This may be an interesting and fully sustainable way to produce this interesting fuel, provided that materials efficiency becomes sufficient and solar light can be effectively harvested. After a first introduction to the key features of the photoreforming process, the attention will be directed to the needs for materials development correlated to the existing knowledge on reaction mechanisms. Examples are then given on the photoreforming of alcohols, the most studied topic, especially in the case of methanol and carbohydrates. Finally, some examples of more complex but more interesting substrates, such as waste solutions, are proposed.

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“…The overvoltage of H 2 evolution can be decreased by modifying the TiO 2 surface with noble metals (mostly Au [ 3 , 4 , 5 , 6 ], Pd [ 7 ], Pt [ 8 , 9 , 10 ], and Ag [ 11 ]). Such surface metal nanoparticles can also decrease the electron-hole recombination rate, leading to a better photocatalytic performance [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic H2 Evolution Using Different Commercial TiO2 Catalysts Deposited with Finely Size-Tailored Au Nanoparticles: Critical Dependence on Au Particle Size

et al. 2014

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One weight percent of differently sized Au nanoparticles were deposited on two commercially available TiO2 photocatalysts: Aeroxide P25 and Kronos Vlp7000. The primary objective was to investigate the influence of the noble metal particle size and the deposition method on the photocatalytic activity. The developed synthesis method involves a simple approach for the preparation of finely-tuned Au particles through variation of the concentration of the stabilizing agent. Au was deposited on the TiO2 surface by photo- or chemical reduction, using trisodium citrate as a size-tailoring agent. The Au-TiO2 composites were synthetized by in situ reduction or by mixing the titania suspension with a previously prepared gold sol. The H2 production activities of the samples were studied in aqueous TiO2 suspensions irradiated with near-UV light in the absence of dissolved O2, with oxalic acid or methanol as the sacrificial agent. The H2 evolution rates proved to be strongly dependent on Au particle size: the highest H2 production rate was achieved when the Au particles measured ~6 nm.

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Hybridized synergy effect among TiO2, Pt and graphite silica on photocatalytic hydrogen production from water–methanol solution

Cited by 16 publications

References 14 publications

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

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

Hydrogen Production by Photoreforming of Renewable Substrates

Photocatalytic H2 Evolution Using Different Commercial TiO2 Catalysts Deposited with Finely Size-Tailored Au Nanoparticles: Critical Dependence on Au Particle Size

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