Enhanced photocatalytic activity of hydrogen evolution through Cu incorporated ZnO nano composites

Manzoor, Mian Faisal; Ahmed, Ejaz; Ahmad, Mahmood; Ahmad, Irshad; Rana, Anwar Manzoor; Ali, Akhtar; Ghouri, M.I.; Manzoor, Mian Sohail; Aziz, Muhammad Tariq

doi:10.1016/j.mssp.2020.105278

Cited by 33 publications

(15 citation statements)

References 52 publications

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“…Subsequently, e À and h + migrate to the catalyst surface and undergo a redox reaction with H + and H 2 O to produce H 2 and O 2 . [36,37] However, e À and h + are unstable and easily recombine during migration. Therefore, an appropriate sacrificial agent is usually added to the photocatalytic reaction to consume some h + so that more electrons are involved in the photocatalytic reaction and H 2 production is enhanced.…”

Section: Photocatalytic H 2 Production From Water Splittingmentioning

confidence: 99%

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

Guo

Lü

et al. 2023

ChemistrySelect

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ZnO/CdS composite was prepared using a simple one‐step hydrothermal method, and its photocatalytic performance was investigated under different conditions. The photocatalytic efficiency of ZnO/CdS was 6345.04 μmol ⋅ g−1 ⋅ h−1 in H2 production from water splitting using Na2S and Na2SO3 as sacrificial agents. The photocatalytic efficiency of eosin Y‐sensitized ZnO/CdS was 6939.39 μmol ⋅ g−1 ⋅ h−1 when triethanolamine was used as a sacrificial agent. The photocatalytic activity of ZnO/CdS was better than those of pristine ZnO and CdS during H2 evolution. The ZnO/CdS composite also exhibited superior photocatalytic activity compared to pristine ZnO and CdS in the degradation of a mixed dye pollutant. The degradation rates of methylene blue, rhodamine B, and orange G in the mixed dye after 120 min of irradiation were 99.41 %, 92.96 %, and 65.74 %, respectively. Possible mechanisms for photocatalytic H2 production and photocatalytic degradation of organic pollutants have been proposed.

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Section: Photocatalytic H 2 Production From Water Splittingmentioning

confidence: 99%

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

Guo

Lü

et al. 2023

ChemistrySelect

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“…% Cu incorporated ZnO shows the highest H 2 production (58.40 μmol) which is almost three times more than the bare ZnO (20.21 μmol) within 10 h [12]. Cu incorporated ZnO synthesized by sol gel method caused an enhancement in H 2 production from 7.49 to 41.55 μmol g −1 which is due to the reduced recombination of electrons and holes during photocatalytic reaction [13]. Ag-doped ZnO nano composites were synthesized by a plasma-assisted approach and used as catalysts in the production of hydrogen by photo-reforming of alcoholic solutions, yielding a stable H 2 evolution even by the sole use of simulated solar radiation.…”

Section: Introductionmentioning

confidence: 91%

“…Hence, the photogenerated holes attack the methanol to form formaldehyde and hydrogen. Here, methanol also act as hole scavenger to increase the electron-hole separation [13]. Methanol is less polar (dipole moment is 1.69D) than water (dipole moment is 1.84D).…”

Section: Mechanism Of Photocatalytic H 2 Production Over Ce/ Znomentioning

confidence: 99%

Efficient photocatalytic hydrogen production over Ce/ZnO from aqueous methanol solution

Patil

Jadhav

Bhoir

2021

Mater Renew Sustain Energy

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Ce/ZnO crystallites along with bare ZnO were prepared by solution free mechanochemical method and characterized with powder XRD, SEM, EDX, XPS, UV–Visible and Photoluminescence (PL) spectra. The visible light photocatalytic performance of these materials was investigated for H2 evolution with the aqueous 10vol% methanol solution under one sun conditions using solar simulator. X-ray diffraction data suggests the hexagonal wurtzite structure for Ce/ZnO crystallites and the incorporation of Ce4+ ion in ZnO is supported by the shifting of XRD peaks to lower Bragg angles that indicate lattice expansion. With the increase of Ce content in ZnO, the crystallite size of Ce/ZnO decreases and the specific surface area increases. UV–Visible spectra propose the decrease in optical band gap of Ce incorporated ZnO with the increase of Ce content up to 3 mol. %. The XPS analysis supports the incorporation of Ce4+ in Ce/ZnO. The PL spectra propose that, with the insertion of Ce ions into ZnO, intensity of UV emission band decreases that reflects the low recombination rate of photogenerated charge carriers, which is responsible for higher photocatalytic H2 production. The extent of hydrogen production is affected by calcination temperature of Ce/ZnO. 2 mol. % Ce incorporated ZnO calcined at 600 °C produces43 μmolh−1 g−1 of hydrogen.

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“…After 150 min of exposure to visible light, the MB degradation efficiencies were about 54.95 % and 76.65 % for ZnO and ZnO:Cu, respectively. The doping effect on the enhanced photocatalytic activity could be from various reasons such as ZnO bandgap reduction [19], enhanced light absorption [20], and excited carriers separation [11] which all affect photoelectron-hole generation/recombination processes.…”

Section: Photocatalytic Activity Experimentsmentioning

confidence: 99%

ON THE CONTRIBUTION FACTORS OF ENHANCED PHOTOCATALYTIC ACTIVITY OF DOPED SEMICONDUCTORS: STRUCTURAL AND OPTICAL INTVESTIGATION OF CU2+ DOPED ZnO NANOPARTICLE

Sang

Quynh

Anh

2021

JST

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As a traditional direct bandgap oxide semiconductor, ZnO, showed as a promising photocatalytic candidate. Researchers worldwide reported many possibilities to improve its photocatalytic activity such as doped with metal, non-metal ions. As a result of heterojunction formation between ZnO and its intentional impurity, previous reports showed beneficial characteristics for enhancing photocatalytic activity in these ZnO-based materials, i.e. bandgap narrowing, recombination rate of photoelectron-hole prolonging, visible light absorption improving. This work will present the photocatalytic acitivity improvement of ZnO when doping with ion Cu2+ and try to illustrate the crucial photocatalytic enhancement factors.

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Enhanced photocatalytic activity of hydrogen evolution through Cu incorporated ZnO nano composites

Cited by 33 publications

References 52 publications

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

Efficient photocatalytic hydrogen production over Ce/ZnO from aqueous methanol solution

ON THE CONTRIBUTION FACTORS OF ENHANCED PHOTOCATALYTIC ACTIVITY OF DOPED SEMICONDUCTORS: STRUCTURAL AND OPTICAL INTVESTIGATION OF CU2+ DOPED ZnO NANOPARTICLE

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