Production of peroxide species in Pt/TiO2 suspensions under conditions of photocatalytic water splitting and glycerol photoreforming

Daskalaki, Vasileia M.; Panagiotopoulou, Paraskevi; Kondarides, Dimitris Ι.

doi:10.1016/j.cej.2010.11.093

Cited by 111 publications

(57 citation statements)

References 32 publications

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“…On the other hand, H 2 O 2 has been observed over Pt/TiO 2 catalysts, maybe formed through the dimerization of hydroxyl radicals [122].…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

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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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“…On the other hand, H 2 O 2 has been observed over Pt/TiO 2 catalysts, maybe formed through the dimerization of hydroxyl radicals [122].…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

“…Many intermediates may also form the most abundant being methanol, which are completely converted to H 2 and CO 2 after proper reaction time. The kind of oxidizing species was also investigated, particularly focusing on the formation of peroxide species on catalyst surface and in solution [122].…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

Hydrogen Production by Photoreforming of Renewable Substrates

Rossetti

2012

ISRN Chemical Engineering

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“…Among the literatures reported Pt/TiO 2 catalyst for H 2 production, the optimal Pt contents were mainly in the region of 0.1-2 wt %. 15,23,36,39 However, in this investigation, no obvious H 2 production increase was observed when the Pt content beyond 0.02 wt %. This optimal Pt content is much lower than that in the previous reports, indicating such Pt loaded dihydroxy naphthalene/TiO 2 system can dynamic decrease the noble metal content which is beneficial to decrease the cost.…”

Section: Samplementioning

confidence: 65%

Preparation of Dihydroxy Naphthalene/TiO₂Complex via Surface Modification and Their Photocatalytic H₂Production Performances Under Visible Light

Hu¹,

Li²,

Fan³

2013

Bulletin of the Korean Chemical Society

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The dihydroxy naphthalene/TiO 2 complexes with different substitution patterns were prepared by surface modification. X-ray diffraction, UV-Vis spectroscopy, photoluminescence, and X-ray photoelectron spectroscopy were used to characterize the prepared composite materials. The results indicated that the surface modification did not influence the crystallization of TiO 2 . The visible-light absorbances of prepared dihydroxy naphthalene/TiO 2 complexes could be assigned to the ligand-to-metal charge transfer. The obtained catalyst exhibited outstanding photocatalytic activity and stability under visible light. A linear relationship existed between the percentages of hydroxynaphthalenes coordinated on TiO 2 surface and H 2 production ability. The substitution pattern of dihydroxy naphthalene and CH 3 OH content could also influence the photocatalytic performance remarkably. The photocatalytic H 2 production ability was further improved after loading with ultra low concentration of Pt, 0.02 wt %. The possible mechanism was proposed.

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“…Many of these species are often reported in literature and considered active reactants in photocatalytic decomposition of organic compounds, when these catalysts are used for water purification or biomass transformation. [33][34][35][36] The capture or consumption of oxygen and the oxygen evolution reaction appear to be competitive phenomena occurring at different surface sites. Upon Zn doping to Ga 2 O 3 , the fivefold rise in hydrogen evolution is not accompanied by stoichiometric oxygen production (Fig.…”

Section: Understanding the Effects Of Zn Doping And Rh/cr Depositionmentioning

confidence: 99%

Understanding synergetic effects of Zn and Rh–Cr promotion to wide-bandgap Ga, Ta and Ti oxides in photocatalytic water splitting

Bazzo

Urakawa

2016

Catal. Sci. Technol.

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a Promotion of semiconductor metal oxides by specific chemical elements is a widespread approach to enhance photocatalytic water splitting activity. Extraordinary boosting in the activity has been recently reported by Zn (dopant) and Rh-Cr (co-catalyst) promotion to Ga-oxide based photocatalysts. Herein, we report the general applicability of the effectiveness of the promotion strategy used for Ga oxides to Ta and Ti oxides in water splitting under UV irradiation using a slurry reactor. Photophysic characterization (photoluminescence and its decay) was used to clarify the specific roles of Zn and Rh-Cr and their synergetic catalytic action. Our experiments indicate that Zn acts as a booster of charge separation lifetime. Zn-promotion alone, however, does not trigger a great boost in catalytic activity in absence of Rh-Cr. Only when Rh-Cr is added the charge separation boost is fully exploited and driven within the catalyst towards overall water splitting. Effective wavelength ranges of excitation UV light source were also investigated in detail, leading to questioning the dominant semiconductor bandgap model for this class of catalysts.

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Production of peroxide species in Pt/TiO2 suspensions under conditions of photocatalytic water splitting and glycerol photoreforming

Cited by 111 publications

References 32 publications

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen Production by Photoreforming of Renewable Substrates

Preparation of Dihydroxy Naphthalene/TiO₂Complex via Surface Modification and Their Photocatalytic H₂Production Performances Under Visible Light

Understanding synergetic effects of Zn and Rh–Cr promotion to wide-bandgap Ga, Ta and Ti oxides in photocatalytic water splitting

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Production of peroxide species in Pt/TiO2 suspensions under conditions of photocatalytic water splitting and glycerol photoreforming

Cited by 111 publications

References 32 publications

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen Production by Photoreforming of Renewable Substrates

Preparation of Dihydroxy Naphthalene/TiO2Complex via Surface Modification and Their Photocatalytic H2Production Performances Under Visible Light

Understanding synergetic effects of Zn and Rh–Cr promotion to wide-bandgap Ga, Ta and Ti oxides in photocatalytic water splitting

Contact Info

Product

Resources

About

Preparation of Dihydroxy Naphthalene/TiO₂Complex via Surface Modification and Their Photocatalytic H₂Production Performances Under Visible Light