Enhanced photoelectrochemical properties of ZnO/ZnSe/CdSe/Cu 2-x Se core–shell nanowire arrays fabricated by ion-replacement method

Chen, Yuanlu; Wang, Lijuan; Wang, Wenzhong; Cao, Mao‐Sheng

doi:10.1016/j.apcatb.2017.02.049

Cited by 106 publications

(29 citation statements)

References 44 publications

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“…Recently, hybrid core/sheath nanostructures consisting of a metal oxide semiconductor core (ZnO) covered by transition metal di-chalcogenides layers (MX 2 , M: Mo, W, etc., and X: Se, S 2 , Te) and other chalcogenides, such as ZnSe [13,14], CdS [15] and CdSe [16,17], have been explored as potential efficient PEC anode materials stimulated by visible light benefiting from a more effective separation of photo-generated charges. Among various layered (2D) chalcogenide crystals, MoS 2 is considered a promising material because of its tunable bandgap ranging from~1.2 eV (indirect gap) for the bulk crystal to~1.9 eV (direct gap) for the monolayer [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Hybrid ZnO/MoS2 Core/Sheath Heterostructures for Photoelectrochemical Water Splitting

et al. 2021

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The rational synthesis of semiconducting materials with enhanced photoelectrocatalytic efficiency under visible light illumination is a long-standing issue. ZnO has been systematically explored in this field, as it offers the feasibility to grow a wide range of nanocrystal morphology; however, its wide band gap precludes visible light absorption. We report on a novel method for the controlled growth of semiconductor heterostructures and, in particular, core/sheath ZnO/MoS2 nanowire arrays and the evaluation of their photoelectrochemical efficiency in oxygen evolution reaction. ZnO nanowire arrays, with a narrow distribution of nanowire diameters, were grown on FTO substrates by chemical bath deposition. Layers of Mo metal at various thicknesses were sputtered on the nanowire surface, and the Mo layers were sulfurized at low temperature, providing in a controlled way few layers of MoS2, in the range from one to three monolayers. The heterostructures were characterized by electron microscopy (SEM, TEM) and spectroscopy (XPS, Raman, PL). The photoelectrochemical properties of the heterostructures were found to depend on the thickness of the pre-deposited Mo film, exhibiting maximum efficiency for moderate values of Mo film thickness. Long-term stability, in relation to similar heterostructures in the literature, has been observed.

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Section: Introductionmentioning

confidence: 99%

Hybrid ZnO/MoS2 Core/Sheath Heterostructures for Photoelectrochemical Water Splitting

et al. 2021

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“… 24 − 27 In addition, GO characteristics, as carbon-based material with a large surface area, extended π-electron conjugation, and high electron conductivity, make it a promising material for combining with the CdSe semiconductor photocatalyst for supporting the electron–hole separation process. 28 − 30 Furthermore, cellulose nanofibrous membranes with a tailorable pore size can blend some particulates to achieve the operative separation of dyes and wastewater purification. In addition, the loading of the synthesized semiconductor materials in the cellulose nanofiber membrane networks through electrospinning allows for increasing the contact area and improve wastewater treatment applications.…”

Section: Introductionmentioning

confidence: 99%

Silver-Doped Cadmium Selenide/Graphene Oxide-Filled Cellulose Acetate Nanocomposites for Photocatalytic Degradation of Malachite Green toward Wastewater Treatment

et al. 2021

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Silver-doped cadmium selenide/graphene oxide (GO) (Ag-CdSe/GO) nanocomposites have been synthesized, loaded in cellulose acetate (CA) to form Ag-CdSe/GO@CA heterostructure nanofibers, and characterized in terms of structural, morphological, photocatalytic properties, among others. The photocatalytic degradation of malachite green (MG) was estimated using cadmium selenide-filled CA (CdSe@CA), silver-doped cadmium selenide-filled CA (Ag-CdSe@CA), cadmium selenide/GO-filled CA (CdSe/GO@CA), and silver-doped cadmium selenide/GO-filled CA (Ag-CdSe/GO@CA) nanocomposite materials. The Ag-CdSe/GO@CA nanocomposites exhibit and retain an enhanced photocatalytic activity for the degradation of MG dye. This amended performance is associated with the multifunctional supporting impacts of GO, Ag, and CA on the composite structure and properties. The superior photocatalytic activity is related to the fact that both Ag and GO can act as electron acceptors that boost the separation efficiency of photogenerated carriers and the loading of the combined nanocomposite (Ag-CdSe@GO) on CA nanofibers, which can augment the adsorption of electrons and holes and facilitate the movement of carriers. The stability of Ag-CdSe/GO@CA nanocomposite photocatalysts demonstrates suitable results even after five recycles. This study establishes an advanced semiconductor-based hybrid nanocomposite material for efficient photocatalytic degradation of organic dyes.

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“…reported enhanced photocatalytic activity by photoelectrochemical cell (PEC) with Se doped in ZnO and core‐shell structure of ZnO/ZnSe/CdSe/Cu 2−x Se. The prepared nanostructures showed the enhanced light absorbance and blue shift behavior due to Burstein–Moss shift, compared with the undoped ZnO and superior PEC performance respectively ,. Moreover, a coupled semiconductor/nano‐heterostructures systems containing Oxide/Oxide, Selenide/Sulfide as well as Sulfide/Oxide types were also reported to have enhanced photoactivity ,.…”

Section: Introductionmentioning

confidence: 95%

ZnSe/ZnO Nano-Heterostructures for Enhanced Solar Light Hydrogen Generation

et al. 2017

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The one dimensional Zinc Selenide/Zinc Oxide (ZnSe/ZnO) nano‐heterostructures were prepared using solvo/hydrothermal reaction technique with varying concentration of ZnSe. The prepared nano‐heterostructures were characterized with various techniques. X‐ Ray Diffraction (XRD) indicates the formation of cubic ZnSe and hexagonal phase of ZnO. Field Emission Scanning Electron Microscopy (FESEM) depicts the formation of rod shaped ZnO nanostructures decorated with spherical nanoparticles of ZnSe. Field Emission Transmission Electron Microscopy (FETEM) validates the formation ZnO nanorods of size 30–40 nm along with spherical ZnSe (25‐30 nm) nanostructures. The UV‐Visible absorption spectra analysis clearly depicts the extended absorbance in the visible region. Photoluminescence study indicates the sharp band edge emission peak at 390 nm and broad peak at 475 nm. With further increase in ZnSe concentration, the intensity of band edge emission peak decreases due to the vacancy defects. The photocatalytic performance of prepared ZnSe/ZnO nano‐heterostructure was evaluated by studying the hydrogen (H2) generation via water (H2O) splitting under UV‐Visible light. The ZnSe/ZnO (10:90 weight ratio) shows 491 μmol of H2 generation after 4 hours irradiation. With increase in amount of ZnSe upto 10 mol%, the H2 evolution was also enhanced due to narrowing of the band gap and suppression of recombination rate of charge carriers.

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Enhanced photoelectrochemical properties of ZnO/ZnSe/CdSe/Cu 2-x Se core–shell nanowire arrays fabricated by ion-replacement method

Cited by 106 publications

References 44 publications

Hybrid ZnO/MoS2 Core/Sheath Heterostructures for Photoelectrochemical Water Splitting

Hybrid ZnO/MoS2 Core/Sheath Heterostructures for Photoelectrochemical Water Splitting

Silver-Doped Cadmium Selenide/Graphene Oxide-Filled Cellulose Acetate Nanocomposites for Photocatalytic Degradation of Malachite Green toward Wastewater Treatment

ZnSe/ZnO Nano-Heterostructures for Enhanced Solar Light Hydrogen Generation

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