Interparticle double charge transfer mechanism of heterojunction α-Fe2O3/Cu2O mixed oxide catalysts and its visible light photocatalytic activity

Lakhera, Sandeep Kumar; Watts, Aakash; Hafeez, Hafeez Yusuf; Neppolian, Bernaurdshaw

doi:10.1016/j.cattod.2017.03.020

Cited by 96 publications

(42 citation statements)

References 74 publications

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“…The composite with 30 wt% WO 2.72 shows the best activity among all the composites, and approximately 100% of MO was removed within 60 min, which may be attributed to the large number of photogenerated carriers, in accordance with the FESEM findings. Compared with some reported conventional inorganic materials, MOFs and their composites, our material has excellent performance for the degradation of MO (Table S1) . The kinetic fitting curves for MO degradation with different photocatalysts are shown in Fig.…”

Section: Resultssupporting

confidence: 84%

Fabrication of WO_2.72/UiO‐66 nanocomposites and effects of WO_2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

Zhang

Yang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Recently, hybrid nanocomposites based on metal–organic frameworks (MOFs) and inorganic nanomaterials have been actively investigated as a potential technology for solving the environmental pollution problems. However, to our knowledge, there have been no composites of WO2.72 and MOFs reported until now. In this study, highly dispersed WO2.72 nanorods were first grown in situ upon UiO‐66 through a hydrothermal process. RESULTS The optimal content of the WO2.72 (30 wt%) could be intuitively judged by field emission scanning electron microscopy. The degradation efficiency of methyl orange (MO) in photocatalysis with 30 wt% WO2.72 loading exhibited better photocatalytic activity than bare UiO‐66, WO2.72 and other WO2.72 loadings. The enhancement of photocatalytic activity over hybrid WO2.72/UiO‐66 can be ascribed to the difference of conduction band between WO2.72 and UiO‐66, which could cause the photoelectron inject to the WO2.72 from UiO‐66, and the lone pair electrons of –OH and –COOH groups of the UiO‐66, which not only repel excited electrons but also attract photogenerated holes. CONCLUSIONS The enhanced separation of photoexcited carriers between WO2.72 and UiO‐66 led to the enhancement of photocatalytic activity. The photocatalytic reaction mechanism for MO treatment was also studied. © 2018 Society of Chemical Industry

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Section: Resultssupporting

confidence: 84%

Fabrication of WO_2.72/UiO‐66 nanocomposites and effects of WO_2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

Zhang

Yang

et al. 2018

J of Chemical Tech & Biotech

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“…Although Cu 2 O/Bi 2 WO 6 presented higher overall photoactivity against both H 2 and alkanes production, pure Cu 2 O was more favorable for H 2 generation. Coupling of Cu 2 O with α‐Fe 2 O 3 was also proven inactive for H 2 evolution from aqueous glycerol solution while pure Cu 2 O presented significant H 2 evolution under visible light irradiation . In this example, formation of a Type II heterojunction is anticipated allowing e − transfer from the CB of Cu 2 O to α‐Fe 2 O 3 .…”

Section: Cu‐based Materials For Hydrogen Photocatalytic Productionmentioning

confidence: 87%

“…[30b] Besides TiO 2 , other materials have been also coupled with Cu x O. Hu [31] In this example, formation of a Type II heterojunction is anticipated allowing e À transfer from the CB of Cu 2 O to a-Fe 2 O 3 . The decrease in H 2 photoproduction in the heterojunction compared with the pure Cu 2 O has been assigned to the presence of a direct charge transfer mechanism from the high energy CB to that of a lower energy (Type II heterojunctions).…”

Section: Copper Oxidesmentioning

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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“…In the last few years, various visible‐light‐active photocatalysts such as CdS, CoO, TaON, Ta 3 N 5 , Cu 2 O and g‐C 3 N 4 , have been reported for solar water splitting . Among these, g‐C 3 N 4 is a promising low cost, chemically stable, environmentally friendly and visible‐light‐absorbing photocatalyst for water splitting owing to its very high reduction potential and simple one‐step synthesis process .…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9] In the last few years, various visible-light-active photocatalysts such as CdS, CoO, TaON, Ta 3 N 5 ,C u 2 Oa nd g-C 3 N 4 ,h ave been reported for solarw ater splitting. [10][11][12] Amongt hese,g -C 3 N 4 is ap romising low cost, chemically stable, environmentally friendly and visible-light-absorbing photocatalyst for water splitting owing to its very high reduction potential and simple one-step synthesis process. [13] Despite these advantages, g-C 3 N 4 has very low photocatalytic efficiency owing to its weak p-p conjugated stacked structure, which results in ah igh recombination rate of charged carriers.…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐Functionalized and Ni^+x (x=2, 3)‐Coordinated Graphitic Carbon Nitride Nanosheets with Long‐Life Deep‐Trap States and their Direct Solar‐Light‐Driven Hydrogen Evolution Activity

et al. 2019

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Graphitic carbon nitride, a 2 D layered photocatalyst coupled with transition metal oxides often shows promising photocatalytic hydrogen evolution activity. However, low surface area and poor charge separation greatly hinder its photocatalytic efficiency. A Ni+x(x=2, 3)/O−g‐C3N4 photocatalyst with a very high specific surface area (199 m2 g−1) has been prepared by thermal condensation and wet‐impregnation methods. The oxygen‐functionalized and Ni+x(x=2, 3)‐coordinated g‐C3N4 produced 1664 μmol g−1 of hydrogen evolution from water under direct solar light irradiation in 4 h, which is 23 times higher than that over O−g‐C3N4. This significant enhancement results from the combined effects of large surface area, the formation of long‐life deep‐trap states, effective charge carrier separation, and extended visible light absorption. The separation and transport behavior of the charge carriers are investigated by photoluminescence, time‐resolved photoluminescence, photocurrent and Mott–Schottky measurements. Additionally, the interaction between Ni+x(x=2, 3) and O−g‐C3N4 is studied by X‐ray photoelectron spectroscopy, X‐ray diffraction, and FTIR spectroscopy. The Ni+x(x=2, 3)/O−g‐C3N4 photocatalyst shows remarkable reusability over a period of two months (six cycles). This study may provide a pathway to simultaneously overcome the challenges of low surface area and poor charge separation in g‐C3N4‐based photocatalysts.

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Interparticle double charge transfer mechanism of heterojunction α-Fe2O3/Cu2O mixed oxide catalysts and its visible light photocatalytic activity

Cited by 96 publications

References 74 publications

Fabrication of WO_2.72/UiO‐66 nanocomposites and effects of WO_2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

Fabrication of WO_2.72/UiO‐66 nanocomposites and effects of WO_2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

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

Oxygen‐Functionalized and Ni^+x (x=2, 3)‐Coordinated Graphitic Carbon Nitride Nanosheets with Long‐Life Deep‐Trap States and their Direct Solar‐Light‐Driven Hydrogen Evolution Activity

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Interparticle double charge transfer mechanism of heterojunction α-Fe2O3/Cu2O mixed oxide catalysts and its visible light photocatalytic activity

Cited by 96 publications

References 74 publications

Fabrication of WO2.72/UiO‐66 nanocomposites and effects of WO2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

Fabrication of WO2.72/UiO‐66 nanocomposites and effects of WO2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

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

Oxygen‐Functionalized and Ni+x (x=2, 3)‐Coordinated Graphitic Carbon Nitride Nanosheets with Long‐Life Deep‐Trap States and their Direct Solar‐Light‐Driven Hydrogen Evolution Activity

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Fabrication of WO_2.72/UiO‐66 nanocomposites and effects of WO_2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

Fabrication of WO_2.72/UiO‐66 nanocomposites and effects of WO_2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

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

Oxygen‐Functionalized and Ni^+x (x=2, 3)‐Coordinated Graphitic Carbon Nitride Nanosheets with Long‐Life Deep‐Trap States and their Direct Solar‐Light‐Driven Hydrogen Evolution Activity