Hysteresis phenomena and rate fluctuations under conditions of glycerol photo-reforming reaction over CuOx/TiO2 catalysts

Πεταλά, Αθανασία; Ioannidou, Evangelia; Georgaka, A.; Bourikas, Kyriakos; Kondarides, Dimitris Ι.

doi:10.1016/j.apcatb.2014.09.021

Cited by 61 publications

(28 citation statements)

References 93 publications

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“…Restructuring and formation of metallic Cu nanoparticles in a CuO/Nb 3 O 7 (OH) composite has been also suggested as the step for the observed initial lag in H 2 production under solar irradiation . This induction period in H 2 production observed by many is because CuO reduction to Cu 2 O and Cu 0 is thermodynamically more favorable than proton reduction …”

Section: Cu‐based Materials For Hydrogen Photocatalytic Productionmentioning

confidence: 99%

Photocatalysis for Hydrogen Production and CO₂ Reduction: The Case of Copper‐Catalysts

2018

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Problems derived from climate change dictate the reestablishment of our prospective in energy production. In this direction, converting solar energy through photocatalysis into suitable fuels such as hydrogen and carbon‐based fuels by water splitting and CO2 reduction, respectively, has been established as a promising approach. Currently, the main concern in this field is the development of cost‐effective and efficient photocatalysts. Among the different systems studied, Cu‐based photocatalysts are considered attractive candidates for both applications due to their relative low‐cost, the natural abundance of the constituents and their promising reactivity. In this review, the current progress in the field of Cu‐based photoactive materials for both H2 production and CO2 reduction will be discussed. Finally, an outlook on the challenges and future research directions is given.

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Section: Cu‐based Materials For Hydrogen Photocatalytic Productionmentioning

confidence: 99%

Photocatalysis for Hydrogen Production and CO₂ Reduction: The Case of Copper‐Catalysts

2018

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“…Although H 2 production rates dropped by several orders of magnitude as compared to the pure glucose solutions (see Figure 2 and Table S1), the formation of CO 2 was relevant and of a similar magnitude (in the order of 10 2 µmol g cat −1 h −1 ) than for model systems. Long-term irradiations were then performed in order to check whether H 2 evolution would start after some sort of induction period, as for some related photocatalytic systems reported by the Kondarides' team [49][50][51]. No such phenomenon was observed (see Figure 3).…”

Section: Photocatalytic Hydrogen Production Form Biomass Hydrolysatesmentioning

confidence: 99%

Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2

Imizcoz

Puga

2019

Catalysts

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A systematic study on the solar photocatalytic hydrogen production (photoreforming) performance of M/TiO2 (M = Au, Ag, Cu or Pt) using glucose as a model substrate, and further extended to lignocellulose hydrolysates and wastewaters, is herein presented. Three metal (M) co-catalyst loading methods were tested. Variation of the type of metal results in significantly dissimilar H2 production rates, albeit the loading method exerts an even greater effect in most cases. Deposition-precipitation (followed by hydrogenation) or photodeposition provided better results than classical impregnation (followed by calcination). Interestingly, copper as a co-catalyst performed satisfactorily as compared to Au, and slightly below Pt, thus representing a realistic inexpensive alternative to noble metals. Hydrolysates of either α-cellulose or rice husks, obtained under mild conditions (short thermal cycles at 160 °C), were rich in saccharides and thus suitable as feedstocks. Nonetheless, the presence of inhibiting byproducts hindered H2 production. A novel photocatalytic UV pre-treatment method was successful to initially remove the most recalcitrant portion of these minor products along with H2 production (17 µmol gcat−1 h−1 on Cu/TiO2). After a short UV step, simulated sunlight photoreforming was orders of magnitude more efficient than without the pre-treatment. Hydrogen production was also directly tested on two different wastewater streams, that is, a municipal influent and samples from operations in a fruit juice producing plant, with remarkable results obtained for the latter (up to 115 µmol gcat−1 h−1 using Au/TiO2).

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“…Among the possible alternatives, sunlight‐driven H 2 generation using semiconductor photocatalysis is a clean approach for a viable utilization of solar energy, in the production of a carbon‐free energy carrier . In this regard, TiO 2 is considered to be the most interesting candidate for commercial scale‐up thanks to its favorable photocatalytic properties, as well as low cost, nontoxicity, and chemical stability . Nevertheless, detrimental issues such as the fast charge carrier recombination in titania and its large band gap ( E G = 3.2 eV), resulting in the sole absorption of UV photons (≈4% of the whole solar spectrum), severely limit TiO 2 applications in sunlight and indoor environment .…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, detrimental issues such as the fast charge carrier recombination in titania and its large band gap ( E G = 3.2 eV), resulting in the sole absorption of UV photons (≈4% of the whole solar spectrum), severely limit TiO 2 applications in sunlight and indoor environment . To extend TiO 2 photoactivity into the visible (vis) region and minimize recombination phenomena, several approaches have been undertaken, including doping with metals/nonmetals and preparation of TiO 2 ‐based composites involving other active materials . In this regard, another promising photocatalyst is hematite (α‐Fe 2 O 3 ), an n ‐type semiconductor with a smaller band gap ( E G = 2.2 eV), enabling vis light absorption .…”

Section: Introductionmentioning

confidence: 99%

Iron–Titanium Oxide Nanocomposites Functionalized with Gold Particles: From Design to Solar Hydrogen Production

Barreca

Carraro

Gasparotto

et al. 2016

Adv Materials Inter

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Hematite–titania nanocomposites, eventually functionalized with gold nanoparticles (NPs), are designed and developed by a plasma-assisted strategy, consisting in: (i) the plasma enhanced-chemical vapor deposition of α-Fe2O3 on fluorine-doped tin oxide substrates; the radio frequency-sputtering of (ii) TiO2, and (iii) Au in controlled amounts. A detailed chemicophysical characterization, carried out through a multitechnique approach, reveals that the target materials are composed by interwoven α-Fe2O3 dendritic structures, possessing a high porosity and active area. TiO2 introduction results in the formation of an ultrathin titania layer uniformly covering Fe2O3, whereas Au sputtering yields a homogeneous dispersion of low-sized gold NPs. Due to the intimate and tailored interaction between the single constituents and their optical properties, the resulting composite materials are successfully exploited for solar-driven applications. In particular, promising photocatalytic performances in H2 production by reforming of water–ethanol solutions under simulated solar illumination are obtained. The related insights, presented and discussed in this work, can yield useful guidelines to boost the performances of nanostructured photocatalysts for energy-related applications

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Hysteresis phenomena and rate fluctuations under conditions of glycerol photo-reforming reaction over CuOx/TiO2 catalysts

Cited by 61 publications

References 93 publications

Photocatalysis for Hydrogen Production and CO₂ Reduction: The Case of Copper‐Catalysts

Photocatalysis for Hydrogen Production and CO₂ Reduction: The Case of Copper‐Catalysts

Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2

Iron–Titanium Oxide Nanocomposites Functionalized with Gold Particles: From Design to Solar Hydrogen Production

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Hysteresis phenomena and rate fluctuations under conditions of glycerol photo-reforming reaction over CuOx/TiO2 catalysts

Cited by 61 publications

References 93 publications

Photocatalysis for Hydrogen Production and CO2 Reduction: The Case of Copper‐Catalysts

Photocatalysis for Hydrogen Production and CO2 Reduction: The Case of Copper‐Catalysts

Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2

Iron–Titanium Oxide Nanocomposites Functionalized with Gold Particles: From Design to Solar Hydrogen Production

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Photocatalysis for Hydrogen Production and CO₂ Reduction: The Case of Copper‐Catalysts

Photocatalysis for Hydrogen Production and CO₂ Reduction: The Case of Copper‐Catalysts