Photocatalytic hydrogen evolution over mesoporous TiO2/metal nanocomposites

Korzhak, A. V.; Ermokhina, N. I.; Stroyuk, A. L.; Bukhtiyarov, V.K.; Raevskaya, A. E.; Litvin, V. I.; Kuchmiy, Stepan Ya.; Ilyin, Vladimir G.; Manorik, P. A.

doi:10.1016/j.jphotochem.2008.02.026

Cited by 139 publications

(90 citation statements)

References 94 publications

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“…[38] Furthermore, many studies have indicated that anatase TiO 2 with a higher crystallinity, smaller particle size, and larger surface area is favorable for hydrogen production. [22,36,39,40] Among these factors, the hydrogen evolution activity is more susceptible to the effects of the crystallinity and crystal structure than surface area. As a whole, the photocatalytic activity of TiO 2 for hydrogen evolution can be substantially improved by proper selection of the structure, the crystallinity, the particle size, and the surface area of TiO 2 .…”

Section: Crystal Structure and Properties Of Tiomentioning

confidence: 99%

Hydrogen Production over Titania‐Based Photocatalysts

et al. 2010

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Because of their relatively high efficiency, high photostability, abundance, low cost, and nontoxic qualities, titania-based photocatalysts are still the most extensively studied materials for the photocatalytic production of hydrogen from water. The effects of the chemical and physical properties of titania, including crystal phase, crystallinity, particle size, and surface area, on its photoactivity towards hydrogen generation have been identified by various investigations. The high overpotential for hydrogen generation, rapid recombination of photogenerated electrons and holes, rapid reverse reaction of molecular hydrogen and oxygen, and inability to absorb visible light are considered the most important factors that restrict the photoactivity of titania, and strategies to overcome these barriers have been developed. These issues and strategies are carefully reviewed and summarized in this Minireview. We aim to provide a critical, up-to-date overview of the development of titania-based photocatalysts for hydrogen production, as well as a comprehensive background source and guide for future research.

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Section: Crystal Structure and Properties Of Tiomentioning

confidence: 99%

Hydrogen Production over Titania‐Based Photocatalysts

et al. 2010

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“…3b). From this it follows that the presence of the optimum is not due to any specific interactions between the nanoparticles of the metal and the semiconductor, as observed for example in photocatalytic systems for the production of hydrogen based on nanostructured TiO 2 [19], and may be determined mainly by the properties of the Ni 0 nanoparticles themselves and by their size in particular. We note that the best photocatalysts are Cd x Zn 1-x S/Ni 0 nanostructures with x = 0.4-0.5 and 2 mole % of nickel, in the presence of which the quantum yield for the release of hydrogen from solutions of Na 2 SO 3 amounts to 0.25.…”

Section: Photocatalytic Release Of Hydrogen In Systems Based On Collomentioning

confidence: 81%

Photocatalytic production of hydrogen in systems based on Cd x Zn1–x S/Ni0 nanostructures

et al. 2009

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A relation was established between the composition of Cd x Zn 1-x S nanoparticles and their ability to accumulate excess negative charge during irradiation. The rate of expenditure of the accumulated charge depends on the composition of the nanoparticles and is determined by their electric capacitance. A correlation was found between the photocatalytic activity of the Cd x Zn 1-x S nanoparticles in the release of hydrogen from solutions of Na 2 SO 3 , their composition, and their capacity for photoinduced accumulation of excess charge. It was shown that Ni 0 nanoparticles photodeposited on the surface of Cd x Zn 1-x S are effective cocatalysts for the release of hydrogen. It was found that Zn II additions in photocatalytic systems based on Cd x Zn 1-x S/Ni 0 nanostructures have a promoting action on the release of hydrogen from water-ethanol mixtures.A promising method for the synthesis of hydrogen, which may in the future have a role in hydrogen power generation, is the photocatalytic (photoelectrocatalytic) reduction of water [1] through solar energy. Significant advances in this direction today have been achieved through the use of semiconductor (SC) photocatalysts [1-3]. High quantum yields for the photorelease of hydrogen during the action of visible light are observed in systems containing nanostructured metal-sulfide semiconductors (CdS, Cd x Zn 1-x S, In 2 S 3 , Bi 2 S 3 , MoS 2 , etc.) and composites with broadband semiconductors based on them and also various electron donors, in the oxidation of which the water is reduced to hydrogen [2,3].Photocatalytic systems for the production of hydrogen on the basis of Cd x Zn 1-x S have two characteristic features that distinguish them from a number of other similar systems based on metal-sulfide semiconductors. It is the propensity of compounds of the Cd x Zn 1-x S series for photocatalytic reduction of water in the absence of metallic cocatalysts and the "bell-shaped" dependence of the photocatalytic activity of the semiconductor on its composition (the values of x) [4,5]. The reasons for these features of the Cd x Zn 1-x S compounds still remain a subject of discussion [6][7][8][9].It should be noted that the ability of these compounds to overcome the overpotential of hydrogen release without additional catalysts provides an indication that they change during irradiation into a more high-energy charged state similar to what occurs during the release of hydrogen at bulk [10] and nanodimensional metallic electrodes [11]. In the mean time there 12 0040-5760/09/4501-0012

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“…6 Recently, it has been demonstrated that mesoporous TiO 2 films via the self-assembly process outperform those through the assembly of pre-formed TiO 2 nanoparticles. 7 The authors argue that the inter-particle boundaries in the latter give rise to high resistance for photo-generated electrons or holes.…”

Section: -5mentioning

confidence: 99%

Reduced Titania Films with Ordered Nanopores and Their Application to Visible Light Water Splitting

Shahid¹,

Choi²,

Liu³

et al. 2013

Bulletin of the Korean Chemical Society

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We report on the photoelectrochemical properties of partially reduced mesoporous titania thin films. The fabrication is achieved by synthesizing mesoporous titania thin films through the self-assembly of a titania precursor and a block copolymer, followed by aging and calcination, and heat-treatment under a H 2 (1 torr) environment. Depending on the temperature used for the reaction with H 2 , the degree of the reduction (generation of oxygen vacancies) of the titania is controlled. The oxygen vacancies induce visible light absorption, and decrease of resistance while the mesoporosity is practically unaltered. The photoelectrochemical activity data on these films, by measuring their photocurrent-potential behavior in 1 M NaOH electrolyte under AM 1.5G 100 mW cm −2 illumination, show that the three effects of the oxygen vacancies contribute to the enhancement of the photoelectrochemical properties of the mesoporous titania thin films. The results show that these oxygen deficient TiO 2 mesoporous thin films hold great promise for a solar hydrogen generation. Suggestions for the materials design for improved photoelectrochemical properties are made.

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Photocatalytic hydrogen evolution over mesoporous TiO2/metal nanocomposites

Cited by 139 publications

References 94 publications

Hydrogen Production over Titania‐Based Photocatalysts

Hydrogen Production over Titania‐Based Photocatalysts

Photocatalytic production of hydrogen in systems based on Cd x Zn1–x S/Ni0 nanostructures

Reduced Titania Films with Ordered Nanopores and Their Application to Visible Light Water Splitting

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