Synthesis of Cr2O3/TNTs nanocomposite and its photocatalytic hydrogen generation under visible light irradiation

Zhang, Yaojun; Wang, Ya Chao; Yan, Wei; Li, Tuo; Li, Sheng; Hu, Ya Ru

doi:10.1016/j.apsusc.2009.07.080

Cited by 29 publications

(11 citation statements)

References 29 publications

(35 reference statements)

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“…Only a few studies applied TiNT as photoanodes 12,30,31 , and in those cases, the obtained films were formed by randomly orientated TiNT, and the potential for O 2 evolution was approximately 0.8 V, which is much higher than the value achieved in this work. Therefore, the synergic effect caused by the heterojunction of TiNT and ZnONR goes beyond lowering the charge recombination; it also enables the acquisition of a TiNT electrode without an agglomeration issue that can be used for the photoelectrocatalysis of water, generating O 2 at lower potentials than those reported previously in the literature 12,30,31 .…”

Section: Electrochemical and Photoelectrochemical Studiescontrasting

confidence: 43%

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

et al. 2016

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a Studies involving water splitting to form hydrogen and oxygen have attracted attention because H2is considered the fuel of the future. Photoelectrocatalysts have been widely used for this application, and several metal oxides can be applied as catalysts. Among them, we highlight zinc oxide nanorods (ZnONRs) and titanate nanotubes (TiNTs); however, their individual nanostructures exhibit disadvantages. For example, ZnONR shows rapid recombination of the photogenerated charges, and TiNT gives rise to randomly orientated films; these disadvantages limit their application as photoanodes. In this study, for the first time, we present a new class of multihierarchical electrodes based on TiNT-decorated ZnONR films that exhibited superior results to the individual species. The TiNTs are homogenously dispersed over the surface of the rods without forming agglomerates, giving rise to a heterojunction that exhibits lower recombination rates. It was found that the results are better when the contents of TiNT in the electrode are higher; thus, glycine was successfully used as a bridge to link both of the structures, increasing the amount of TiNT decorating the rods. As a result, the photocurrent generated with these multihierarchical electrodes is higher than that obtained for pure ZnONR electrodes (0.9 mA and 0.45 mA, respectively), and the electrode potentials for O2 evolution is lower than that observed for pure TiNT electrodes (0 V and 0.8 V vs. ERHE, respectively). The IPCE values are also higher for the multihierarchical electrodes.

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Section: Electrochemical and Photoelectrochemical Studiescontrasting

confidence: 43%

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

et al. 2016

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“…[11] Concerning photocatalysis, only a few reports mention the deposition of chromium species on the TiO 2 surface. [15][16][17] Chromium oxidation state and the extent of oligo-/polymerization of chromium oxyhydroxide on the titania surface are suspected to set the photocatalytic activity. The highest photonic efficiency reached 1.9 % in the visible region.…”

Section: Introductionmentioning

confidence: 99%

“…The highest photonic efficiency reached 1.9 % in the visible region. [15][16][17] Chromium oxidation state and the extent of oligo-/polymerization of chromium oxyhydroxide on the titania surface are suspected to set the photocatalytic activity. Thus, some of the interesting photocatalytic performances may be attributed to grafted chromium moieties or to a mixture of chromium oxide or oxyhydroxide with titania.…”

Section: Introductionmentioning

confidence: 99%

Photocatalysis with Chromium‐Doped TiO₂: Bulk and Surface Doping

Ould‐Chikh

Proux²,

Afanasiev

et al. 2014

ChemSusChem

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The photocatalytic properties of TiO2 modified by chromium are usually found to depend strongly on the preparation method. To clarify this problem, two series of chromium-doped titania with a chromium content of up to 1.56 wt % have been prepared under hydrothermal conditions: the first series (Cr:TiO2) is intended to dope the bulk of TiO2, whereas the second series (Cr/TiO2) is intended to load the surface of TiO2 with Cr. The catalytic properties have been compared in the photocatalytic oxidation of formic acid. Characterization data provides evidence that in the Cr/TiO2 catalysts chromium is located on the surface of TiO2 as amorphous CrOOH clusters. In contrast, in the Cr:TiO2 series, chromium is mostly dissolved in the titania lattice, although a minor part is still present on the surface. Photocatalytic tests show that both series of chromium-doped titania demonstrate visible-light-driven photo-oxidation activity. Surface-doped Cr/TiO2 solids appear to be more efficient photocatalysts than the bulk-doped Cr:TiO2 counterparts.

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“…The same concept has been extended to visible light absorbing semiconductors embedded into a lamellar [95] or tubular [96,97] structures, able to withdraw the photogenerated separated charges ( Figure 6). …”

Section: Materials and Mechanismsmentioning

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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Synthesis of Cr2O3/TNTs nanocomposite and its photocatalytic hydrogen generation under visible light irradiation

Cited by 29 publications

References 29 publications

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

Photocatalysis with Chromium‐Doped TiO₂: Bulk and Surface Doping

Hydrogen Production by Photoreforming of Renewable Substrates

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Synthesis of Cr2O3/TNTs nanocomposite and its photocatalytic hydrogen generation under visible light irradiation

Cited by 29 publications

References 29 publications

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

Photocatalysis with Chromium‐Doped TiO2: Bulk and Surface Doping

Hydrogen Production by Photoreforming of Renewable Substrates

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Product

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Photocatalysis with Chromium‐Doped TiO₂: Bulk and Surface Doping