Improvement of the photocatalytic performance of ZnO thin films in the UV and sunlight range by Cu doping and additional coupling with Cu2O

Nouasria, Fatima Zohra; Selloum, Djamel; Henni, Abdellah; Tingry, Sophie; Hrbáč, Jan

doi:10.1016/j.ceramint.2022.01.207

Cited by 27 publications

(9 citation statements)

References 46 publications

(43 reference statements)

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“…The above results obtained indicate that, in the photocatalytic reaction process, O 2 – and h + are the main active species, with ·O 2 – playing a more important role. Here, a simple comparison of the photocatalytic degradation efficiency for MO by various Cu 2 O-based photocatalysts prepared in this work and others reported in literatures − has been made, and the results are shown in Figure d. More information about the comparison is given in Table S4.…”

Section: Resultsmentioning

confidence: 86%

Highly Efficient Photocatalytic Degradation of Organic Pollutants Using a Polyvinylidene Fluoride/Polyvinylpyrrolidone-Cuprous Oxide Composite Membrane

Qing,

Chen,

et al. 2024

Langmuir

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Enhancing the efficiency of photocatalysts in the removal of organic pollutants is of vital importance in wastewater treatment. In this work, a set of composite membranes that can be used for efficient removal of the organic dyes, such as methyl orange (MO), methylene blue (MB), and Congo red (CR), were prepared through coblending/ electrospinning techniques using polyvinylidene fluoride (PVDF) as the substrate, polyvinylpyrrolidone (PVP) as the dispersing agent and wettability regulator, and cuprous oxide (Cu 2 O) as the photocatalyst. The results showed that Cu 2 O particles were well encapsulated in the electrospun PVDF/PVP fibers, and the composite membranes exhibited apparently enhanced hydrophilicity. Furthermore, compared with the pure Cu 2 O particles, the composite membranes not only showed a higher photocatalytic degradation ratio for MO (93.6%) but also showed a much higher degradation rate (62.4 mg/(mg•h)) in comparison with the other reported Cu 2 O-based composite photocatalytic materials in the literature. In addition, the membrane sample also had excellent recycling stability, and the retention rate of its removal ability maintained 92.1% after 5 times of recycling. Furthermore, the composite membranes also showed high removal ability toward MB and CR, with photocatalytic degradation ratios of 81.4 and 76.1%, respectively. This work indicates that the prepared PVDF/PVP-Cu 2 O composite membranes possess promising application prospects in wastewater treatment.

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Section: Resultsmentioning

confidence: 86%

Highly Efficient Photocatalytic Degradation of Organic Pollutants Using a Polyvinylidene Fluoride/Polyvinylpyrrolidone-Cuprous Oxide Composite Membrane

Qing,

Chen,

et al. 2024

Langmuir

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“…On the other hand, Cu dopants can form defect states in the band gap of ZnO, as demonstrated in Figure . Here, the positions of Cu + and Cu 2+ states in ZnO are referenced from previous studies. , Under light conditions, the Cu:ZnO shell can absorb incident photons to generate electron–hole pairs. Notably, hole carriers will be absorbed by O 2 – anions on the outer surface, as illustrated in eq ; meanwhile, electron carriers excited into the conduction band ( E c ) of the Cu:ZnO layer can easily migrate to the E c of the core ZnO and then move toward to the silver electrodes (generating the photocurrent). normalO 2 − 0.25em ( ad ) + h + → O 2 0.25em ( gas ) …”

Section: Resultsmentioning

confidence: 99%

Enhancing the Performance of ZnO-Based Photodetectors by Forming ZnO/(Cu:ZnO) Core/Shell Nanorods

Huynh,

Nguyen,

Dinh

et al. 2024

ACS Appl. Electron. Mater.

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ZnO nanomaterials are some of the most excellent candidates for low-cost but high-performance photodetectors, particularly in the UV region. Besides doping, architecting ZnO nanomaterials to extend their application is still attractive for developing low-cost optoelectronic devices. Thereby, this study introduces the innovation of ZnO nanorod-based photodetectors by combining two techniques, which are Cu doping and core/shell structuring. Particularly, the active material (ZnO/(Cu-doped ZnO) core/shell nanorods) was synthesized by a low-cost and easy fabrication process. Our device using the developed core/shell nanorods exhibits the maximum responsivity of ca. 4.5 mA W −1 at 395 nm light exposure, which is nearly 180% higher than that of a device based on Cu-doped ZnO NRs (formed with only the Cu-doping technique). This enhancement responsivity is attributed to the improved charge transport at the interface of the core/shell ZnO/(Cu-doped ZnO) NRs, which pertains to a process that reduces the electron−hole recombination probability, resulting in an improvement in the efficiency of the photodetectors. These outcomes reveal the essential role of core−shell structuring in improving the efficiency of ZnO-based photodetectors. In general, our study of ZnO/(Cu-doped ZnO) core/shell nanorods opens a potential approach for developing better photodetectors.

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“…Confirming the presence of optical-electrical properties using Mott-Schottky analysis due to copper-based doping and heterojunction formation has been performed in different studies. 71,72 However, determining the flat band potential for co-doped materials is complex and is not also proposed in this study.…”

Section: Catalysis Science and Technology Papermentioning

confidence: 99%

Chemistry of iron and copper co-doped zinc oxide: reduction and degradation of pollutants

Belay,

Abebe,

Tsegaye

et al. 2023

Catal. Sci. Technol.

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Improvement of the photocatalytic performance of ZnO thin films in the UV and sunlight range by Cu doping and additional coupling with Cu2O

Cited by 27 publications

References 46 publications

Highly Efficient Photocatalytic Degradation of Organic Pollutants Using a Polyvinylidene Fluoride/Polyvinylpyrrolidone-Cuprous Oxide Composite Membrane

Highly Efficient Photocatalytic Degradation of Organic Pollutants Using a Polyvinylidene Fluoride/Polyvinylpyrrolidone-Cuprous Oxide Composite Membrane

Enhancing the Performance of ZnO-Based Photodetectors by Forming ZnO/(Cu:ZnO) Core/Shell Nanorods

Chemistry of iron and copper co-doped zinc oxide: reduction and degradation of pollutants

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