A Cu+1/Cu0-TiO2 mesoporous nanocomposite exhibits improved H2 production from H2O under direct solar irradiation

Rather, Rayees Ahmad; Singh, Satnam; Pal, Bonamali

doi:10.1016/j.jcat.2016.11.021

Cited by 69 publications

(19 citation statements)

References 34 publications

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“…Alternatively, doping with transition metal ions such as Cu, Fe, Co, Ni is a cheaper promising option . The advantages of adopting these species lie in their behavior as electron scavengers, thus limiting charge recombination .…”

Section: Introductionmentioning

confidence: 99%

“…[4,5] Even though titanium dioxide in P25 form (80 : 20 w/w anatase:rutile) is considered one of the most promising commercial material for photocatalytic processes, it shows significant limitations, such as fast electron/hole recombination and absorption/activity restricted to the UV region due to its wide bandgap. [6,7] Among the various methods employed for improving TiO 2 properties, doping with noble metals (Au, Pt, Pd) acting as co-catalysts has proven to be effective to enhance the photo-efficiency of titanium dioxide. [3,[8][9][10] Alternatively, doping with transition metal ions such as Cu, Fe, Co, Ni is a cheaper promising option.…”

Section: Introductionmentioning

confidence: 99%

“…[3,[8][9][10] Alternatively, doping with transition metal ions such as Cu, Fe, Co, Ni is a cheaper promising option. [6,9,[11][12][13] The advantages of adopting these species lie in their behavior as electron scavengers, thus limiting charge recombination. [9,10,[14][15][16] In particular, copper loaded-P25 nanomaterials, prepared by impregnation method, have been proposed as promising catalysts for photo-reforming.…”

Section: Introductionmentioning

confidence: 99%

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Near UV‐Irradiation of CuO_x‐Impregnated TiO₂ Providing Active Species for H₂ Production Through Methanol Photoreforming

et al. 2019

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Copper doped‐TiO2 (P25) nanomaterials have been intensively studied as promising catalysts for H2 production by photo‐reforming of selected organic compounds. However, the role of copper oxidation states on the improvement of photocatalytic activity is still debated. In this work, CuOx‐impregnated P25‐TiO2 catalysts were used for photocatalytic production of hydrogen from methanol. Copper species/oxidation states both in the as‐prepared catalysts and after the photocatalytic process were investigated. To this purpose, H2 production rates were correlated to physico‐chemical properties of the samples, both before and after photocatalytic process, by means of Raman, X‐Ray Diffraction, Electron Paramagnetic Resonance spectroscopy, X‐Ray Photoelectron Spectroscopy, Temperature‐Programmed Reduction and High Resolution Transmission Electron Microscope techniques. Results revealed the presence of both Cu2O and CuO deposits on the samples surface after calcination. Notably, under near‐UV irradiation, the fraction of highly dispersed CuO particles undergo a partial dissolution process, followed by reduction to metallic copper Cu(s) by photogenerated electrons, boosting H2 production rate. Our findings indicate that both Cu2O and Cu(s) act as co‐catalysts for H2 generation, yet by different mechanisms. Overall this study, provides the basis to enhance catalytic performance of red‐ox active systems through UV‐irradiation approach.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Near UV‐Irradiation of CuO_x‐Impregnated TiO₂ Providing Active Species for H₂ Production Through Methanol Photoreforming

et al. 2019

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“…As shown in Fig. 4(d), the fringe spacing of Cu-Re(1 : 1) (0.207 nm) is between those of Cu(110) (0.200 nm) and Re(101) (0.211 nm), 45,46 indicating that a Cu-Re alloy was formed in the reduced Cu-Re(1 : 1)/TiO 2 catalyst and this was responsible for strong interaction between metallic Cu and Re species. The result is in good agreement with the TPR results.…”

Section: Characterization Ofmentioning

confidence: 82%

Highly efficient selective hydrogenation of levulinic acid to γ-valerolactone over Cu–Re/TiO₂ bimetallic catalysts

Liu

Zhang

et al. 2022

RSC Adv.

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“…Rayees Ahmad et al [92] prepared a mesoporous Cu-TiO 2 (mpCu-TiO 2 ) photocatalyst for H 2 production that was shown to be active under direct solar irradiation. This photocatalyst was first synthesized by template synthesis, in a blend of titanium butoxide (Ti(OBu) 4 ), ethylene glycol, acetone, distillate water, and acetic acid.…”

Section: Semiconductormentioning

confidence: 99%

Synthesis and Performance of Photocatalysts for Photocatalytic Hydrogen Production: Future Perspectives

Escobedo

Lasa

2021

Catalysts

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Photocatalysis for “green” hydrogen production is a technology of increasing importance that has been studied using both TiO2–based and heterojunction composite-based semiconductors. Different irradiation sources and reactor units can be considered for the enhancement of photocatalysis. Current approaches also consider the use of electron/hole scavengers, organic species, such as ethanol, that are “available” in agricultural waste, in communities around the world. Alternatively, organic pollutants present in wastewaters can be used as organic scavengers, reducing health and environmental concerns for plants, animals, and humans. Thus, photocatalysis may help reduce the carbon footprint of energy production by generating H2, a friendly energy carrier, and by minimizing water contamination. This review discusses the most up-to-date and important information on photocatalysis for hydrogen production, providing a critical evaluation of: (1) The synthesis and characterization of semiconductor materials; (2) The design of photocatalytic reactors; (3) The reaction engineering of photocatalysis; (4) Photocatalysis energy efficiencies; and (5) The future opportunities for photocatalysis using artificial intelligence. Overall, this review describes the state-of-the-art of TiO2–based and heterojunction composite-based semiconductors that produce H2 from aqueous systems, demonstrating the viability of photocatalysis for “green” hydrogen production.

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A Cu+1/Cu0-TiO2 mesoporous nanocomposite exhibits improved H2 production from H2O under direct solar irradiation

Cited by 69 publications

References 34 publications

Near UV‐Irradiation of CuO_x‐Impregnated TiO₂ Providing Active Species for H₂ Production Through Methanol Photoreforming

Near UV‐Irradiation of CuO_x‐Impregnated TiO₂ Providing Active Species for H₂ Production Through Methanol Photoreforming

Highly efficient selective hydrogenation of levulinic acid to γ-valerolactone over Cu–Re/TiO₂ bimetallic catalysts

Synthesis and Performance of Photocatalysts for Photocatalytic Hydrogen Production: Future Perspectives

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A Cu+1/Cu0-TiO2 mesoporous nanocomposite exhibits improved H2 production from H2O under direct solar irradiation

Cited by 69 publications

References 34 publications

Near UV‐Irradiation of CuOx‐Impregnated TiO2 Providing Active Species for H2 Production Through Methanol Photoreforming

Near UV‐Irradiation of CuOx‐Impregnated TiO2 Providing Active Species for H2 Production Through Methanol Photoreforming

Highly efficient selective hydrogenation of levulinic acid to γ-valerolactone over Cu–Re/TiO2 bimetallic catalysts

Synthesis and Performance of Photocatalysts for Photocatalytic Hydrogen Production: Future Perspectives

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Product

Resources

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Near UV‐Irradiation of CuO_x‐Impregnated TiO₂ Providing Active Species for H₂ Production Through Methanol Photoreforming

Near UV‐Irradiation of CuO_x‐Impregnated TiO₂ Providing Active Species for H₂ Production Through Methanol Photoreforming

Highly efficient selective hydrogenation of levulinic acid to γ-valerolactone over Cu–Re/TiO₂ bimetallic catalysts