Photocatalytic hydrogen production using transition metal ions-doped γ-Bi2O3 semiconductor particles

Gurunathan, K.

doi:10.1016/j.ijhydene.2003.04.001

Cited by 151 publications

(83 citation statements)

References 10 publications

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“…The hydrogen production from visible-light photocatalytic splitting 20 of water has already been reported using bulk γ-Bi 2 O 3 on Pt/RuO 2 ( 38 and when using transition metal ion-doped γ-Bi 2 O 3 ( . 39 Recent work 40 has shown that Pt-doped bulk α-Bi 2 O 3 is able to degrade organic pollutants under visible light, so the potential for Bi 2 O 3 induced photocatalysis is encouraging.…”

Section: Physical Measurementsmentioning

confidence: 99%

MOCVD of crystalline Bi2O3 thin films using a single-source bismuth alkoxide precursor and their use in photodegradation of water

et al. 2010

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Bismuth(III) tert-butoxide [Bi(O t Bu) 3 ] was utilised as a single-source precursor to controllably deposit thin films of different phases of bismuth oxide (Bi 2 O 3 ) on glass substrates via low-pressure chemical vapour deposition (LPCVD). Band gaps for the different phases have been measured (E g ¼ 2.3-3.0 eV) and the films displayed excellent photodegradation of water under near-UV irradiation.

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Section: Physical Measurementsmentioning

confidence: 99%

MOCVD of crystalline Bi2O3 thin films using a single-source bismuth alkoxide precursor and their use in photodegradation of water

et al. 2010

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“…[16] Besides this, the height of the Schottky barrier formed at the metal/semiconductor junction can influence the electron flow from semiconductor to the noble metal, resulting in different photocatalytic performance. [17] Since only semiconductors and noble metal with proper alignment of their Fermi band can form an effective Schottky barrier, the selection of an appropriate noble metal and semiconductor to build the metal/semiconductor composite is important for developing highly efficient composite photocatalytic systems. For example, it was previously reported that Ru/TaON showed a significantly enhanced photocatalytic performance for hydrogen evolution, whereas Pt, Ir, and Rh do not have any promoting effect for photocatalysis over TaON.…”

Section: Introductionmentioning

confidence: 99%

Noble Metals Can Have Different Effects on Photocatalysis Over Metal–Organic Frameworks (MOFs): A Case Study on M/NH₂‐MIL‐125(Ti) (M=Pt and Au)

Sun

Liu

et al. 2014

Chemistry A European J

256

139

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M-doped NH2-MIL-125(Ti) (M=Pt and Au) were prepared by using the wetness impregnation method followed by a treatment with H2 flow. The resultant samples were characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS) analyses, N2-sorption BET surface area, and UV/Vis diffuse reflectance spectroscopy (DRS). The photocatalytic reaction carried out in saturated CO2 with triethanolamine (TEOA) as sacrificial agent under visible-light irradiations showed that the noble metal-doping on NH2-MIL-125(Ti) promoted the photocatalytic hydrogen evolution. Unlike that over pure NH2-MIL-125(Ti), in which only formate was produced, both hydrogen and formate were formed over Pt- and Au-loaded NH2-MIL-125(Ti). However, Pt and Au have different effects on the photocatalytic performance for formate production. Compared with pure NH2-MIL-125(Ti), Pt/NH2-MIL-125(Ti) showed an enhanced activity for photocatalytic formate formation, whereas Au has a negative effect on this reaction. To elucidate the origin of the different photocatalytic performance, electron spin resonance (ESR) analyses and density functional theory (DFT) calculations were carried out over M/NH2-MIL-125(Ti).The photocatalytic mechanisms over M/NH2-MIL-125(Ti) (M=Pt and Au) were proposed. For the first time, the hydrogen spillover from the noble metal Pt to the framework of NH2-MIL-125(Ti) and its promoting effect on the photocatalytic CO2 reduction is revealed. The elucidation of the mechanism on the photocatalysis over M/NH2-MIL-125(Ti) can provide some guidance in the development of new photocatalysts based on MOF materials. This study also demonstrates the potential of using noble metal-doped MOFs in photocatalytic reactions involving hydrogen as a reactant, like hydrogenation reactions.

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“…It has been shown that Bi 2 O 3 exists under various isomorphous phases that are: á-, â-, c-and δ-Bi 2 O 3 [6][7][8] . At room temperature and up to 730°C, Bi 2 O 3 exists in a monoclinic á-phase [1][2][3] . Above this temperature, Bi 2 O 3 turns into a d-phase and melts at approximately 825°C.…”

mentioning

confidence: 99%

Chemically stabilized δ-Bi2O3 phase: Raman scattering and X-ray diffraction studies

Loubbidi¹,

Naji²,

Orayech³

et al. 2016

Orient. J. Chem

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Thanks to its peculiar structural properties, the high temperature ä-phase of Bi 2 O 3 is considered as the best oxide ion conductor. Many efforts to stabilize this structure at room temperature have been deployed. In the present study, we have successfully stabilized the ä-phase by chemically introducing tetra-Te 4+ and pentavalent Ta 5+ cations into the structure. A series of compounds with different percentage of Te 4+ / Ta 5+ were obtained. Their structural and vibrational properties were investigated. From the Rietveld refinement of X Ray diffraction pattern we show that the composition x = 0.2 crystallizes in the cubic symmetry, space group Fm 3m (ITA No. 225) with a lattice parameter a =5.49 Å. The reliability factors are: R F =2.151 % and R Bragg =2.545 % confirm the goodness of the refinement. From the evolution of Raman bands, we confirm the existence of the solid solution features. Furthermore, comparing the spectra of ä-Bi 2 O 3 with the alpha phase, we comfortably suggest that the decrease of the number of Raman bands is a consequence of an increase in the lattice symmetry. Similarly to other fluorite compounds, we show that the structure presents oxygen defects clearly identified in the Raman spectra.

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Photocatalytic hydrogen production using transition metal ions-doped γ-Bi2O3 semiconductor particles

Cited by 151 publications

References 10 publications

MOCVD of crystalline Bi2O3 thin films using a single-source bismuth alkoxide precursor and their use in photodegradation of water

MOCVD of crystalline Bi2O3 thin films using a single-source bismuth alkoxide precursor and their use in photodegradation of water

Noble Metals Can Have Different Effects on Photocatalysis Over Metal–Organic Frameworks (MOFs): A Case Study on M/NH₂‐MIL‐125(Ti) (M=Pt and Au)

Chemically stabilized δ-Bi2O3 phase: Raman scattering and X-ray diffraction studies

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Photocatalytic hydrogen production using transition metal ions-doped γ-Bi2O3 semiconductor particles

Cited by 151 publications

References 10 publications

MOCVD of crystalline Bi2O3 thin films using a single-source bismuth alkoxide precursor and their use in photodegradation of water

MOCVD of crystalline Bi2O3 thin films using a single-source bismuth alkoxide precursor and their use in photodegradation of water

Noble Metals Can Have Different Effects on Photocatalysis Over Metal–Organic Frameworks (MOFs): A Case Study on M/NH2‐MIL‐125(Ti) (M=Pt and Au)

Chemically stabilized δ-Bi2O3 phase: Raman scattering and X-ray diffraction studies

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Noble Metals Can Have Different Effects on Photocatalysis Over Metal–Organic Frameworks (MOFs): A Case Study on M/NH₂‐MIL‐125(Ti) (M=Pt and Au)