Photocatalytic degradation of organic dyes by Ni (25%) doped WSe2 nanosheets

Nair, Salil; Joy, Jolly; Limberkar, Chaitanya; Patel, K.D.; Solanki, G. K.; Pathak, V. M.

doi:10.1016/j.mssp.2020.105625

Cited by 19 publications

(9 citation statements)

References 38 publications

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“…Strong reflection peaks were observed at (008) and (006), while other peaks were well indexed at (002), (004), (0010) and (105). The dominance of (00 l ) planes indicates the hexagonal crystal structure formation and the highly c ‐axis‐oriented stacking of layers 21,23 . The observed peaks match well with the already reported data of WSe 2 , 21,24 confirming the proper replacement of W (atomic radius 1.93 Å) by Co (atomic radius 1.52 Å) in the host sample.…”

Section: Resultssupporting

confidence: 87%

“…The dominance of (00l) planes indicates the hexagonal crystal structure formation and the highly c-axis-oriented stacking of layers. 21,23 The observed peaks match well with the already reported data of WSe 2 , 21,24 confirming the proper replacement of W (atomic radius 1.93 Å) by Co (atomic radius 1.52 Å) in the host sample. However, two low-intensity peaks at (101) and (012) indexed to cubic structure with Pa-3 space group were identified.…”

Section: Characterization Techniquessupporting

confidence: 88%

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Enhancement in the transient visible light anisotropic photoresponse of cobalt‐incorporated tungsten diselenide ternary alloy

Joy

Nair

Dixit

et al. 2021

Intl J of Energy Research

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Anisotropy in the optical and electrical properties of many transition metal dichalcogenides provides a great variety of possibilities for device applications.The present work attempts to exploit the anisotropy in photoresponse of pure and Co-incorporated WSe 2 crystals. Energy-dispersive analysis of X-rays affirmed the elemental composition of the crystals grown by the direct vapour transport technique. The surface morphology of the crystals was studied by optical microscopy and scanning electron microscopy, both of which confirmed the layered structure of the same. Layers of the samples and the lattice fringes were concluded under high-resolution transmission electron microscopy. The crystalline nature and hexagonal phase of the crystals were confirmed from X-ray diffraction, further highlighted in the results observed from the selected area electron diffraction pattern. Anisotropic charge conduction properties under illumination due to the layered structure of the sample were analysed. The anisotropy in the photoresponse was confirmed from the current-voltage (I-V) characteristics, which were further explored from its time-dependent photoresponse. The crystals proved to be self-powered photodetectors with higher values of photocurrent (μA), photoresponsivity (μAW À1 ) and photodetectivity (~10 7 -10 8 Jones) recorded for contacts taken parallel to the crystallographic c-axis of the crystals. The effect of Co in improving the photoconductivity of WSe 2 has been analysed based on the photoresponse recorded for pure and Co-incorporated WSe 2 . The present work also illustrates the effect of intensities of illumination and wavelengths of incident radiations in the photocurrent. Photocurrent in μA range observed in the absence of biasing voltage makes the crystals suitable candidates for self-powered photodetection applications.

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Section: Resultssupporting

confidence: 87%

Section: Characterization Techniquessupporting

confidence: 88%

Enhancement in the transient visible light anisotropic photoresponse of cobalt‐incorporated tungsten diselenide ternary alloy

Joy

Nair

Dixit

et al. 2021

Intl J of Energy Research

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“…The equivalent circuit of the fabricated DSSCs F I G U R E 1 0 The measured and fitted impedance spectra of the DSSCs reaction properties of the CE materials, which were already discussed in works reported earlier. 31,42 Table 3 provides a comparison of the efficiencies of the devices with previously reported works, the analysis of which affords an understanding that the DSSCs prepared using TMDC CEs exhibit PCE values close to the previously reported data. However, the results are a bit off from the reported values, which can be easily justified as the (1) DSSC fabricated in work utilized beetroot juice as the sensitizer, which can be in every sense regarded as organic, (2) TMDC CE was layered onto the ITO by drop cast method triggering inhomogeneity throughout the layer as evident from Figure 3C eventually resulting in low electrical conduction.…”

Section: Ffsupporting

confidence: 71%

Dye‐sensitized solar cells based on nickel‐doped tungsten diselenide counter electrodes

2021

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Dye-sensitized solar cells (DSSCs) are gaining considerable interest as substitutes to solar cells based on semiconductor thin-films owing to their costeffective and effortless fabrication methods. Efforts are being made to replace counter electrodes (CE) in DSSCs, which are conventionally based on noble metal platinum (Pt). Among the new materials as CE, two-dimensional (2D) transition metal dichalcogenide is one of the most explored to develop Pt-free DSSCs. We report here the preparation of TiO 2 -based DSSCs using beetroot (Beta vulgaris) extracts as sensitizers with carbon-, pristine-, and Ni (4%)-doped WSe 2 as the CEs. The Ni (4%) WSe 2 CE exhibited a high-power conversion efficiency (PCE) of 5.66% under the illumination of 100 mW cm À2 .The electrical characteristics, including I-V, C-V, and electrochemical impedance spectroscopy, corroborate the better efficiency of Ni (4%) WSe 2 CE. The cost-effectiveness and efficiencies obtained for Pure and Ni (4%) WSe 2 make them a worthy candidate as CE for DSSCs.

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“…The photons around this wavelength should also be capable of exciting Bi 3 TiNbO 9 in spite of low absorption at this wavelength range. The band gap energy of samples could be estimated by the formula: F ( R ) = false( 1 − R false) 2 2 R , where R is the diffuse reflectance of samples . The E g values of Ti0.95, Ti1.00, and Ti1.05 were calculated to be 3.12, 3.09, and 3.07 eV, respectively (Figure e).…”

Section: Results and Discussionmentioning

confidence: 99%

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Cui

Guo

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Constructing facet junction in semiconductor photocatalysts has been demonstrated as an effective method to promote charge-carrier separation and suppress carrier recombination. Herein, we proposed a novel but facile self-doping strategy to regulate the crystal facet exposure ratio in ferroelectric Bi3Ti x Nb2–x O9 single-crystalline nanosheets, thereby optimizing its facet junction effect. Through tuning the atomic ratio of Ti and Nb, the exposure ratio of {001} and {110} crystal planes in Bi3Ti x Nb2–x O9 nanosheets can be delicately modulated, and more {110} facets were exposed with the increase of the Ti/Nb atomic ratio as evidenced by the X-ray diffraction and scanning electron microscopy results. A facet junction between {110} and {001} crystal planes was verified based on the density functional theory calculation and photodeposition experiment results. Photogenerated electrons tend to accumulate in {110}, while holes gathered in {001} crystal planes. Owing to the optimal facet junction effect, the sample of Ti1.05 shows the most efficient charge-carrier separation and transportation compared to Ti0.95 and Ti1.00 as supported by the photoluminescence, surface photovoltage, photoelectrochemistry, and electron paramagnetic resonance (EPR) results. In addition, the oxygen vacancy arising from the inequivalent substitution of Nb5+ by Ti4+ as proved by X-ray photoelectron spectroscopy and EPR results and the enhanced ferroelectricity supported by P–E loops can also assist charge-carrier separation and migration. Benefiting from these properties, Ti1.05 outperformed Ti0.95 and Ti1.00 in the photodegradation of organic dye and antibiotic molecules. Meanwhile, the excellent antibacterial activity of Ti1.05 under visible light was also demonstrated by the Escherichia coli sterilization experiment. This work not only presents a novel pathway to adjust the facet junction but also provides new deep insights into the crystal facet engineering in ferroelectrics as photocatalysts.

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Photocatalytic degradation of organic dyes by Ni (25%) doped WSe2 nanosheets

Cited by 19 publications

References 38 publications

Enhancement in the transient visible light anisotropic photoresponse of cobalt‐incorporated tungsten diselenide ternary alloy

Enhancement in the transient visible light anisotropic photoresponse of cobalt‐incorporated tungsten diselenide ternary alloy

Dye‐sensitized solar cells based on nickel‐doped tungsten diselenide counter electrodes

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

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Photocatalytic degradation of organic dyes by Ni (25%) doped WSe2 nanosheets

Cited by 19 publications

References 38 publications

Enhancement in the transient visible light anisotropic photoresponse of cobalt‐incorporated tungsten diselenide ternary alloy

Enhancement in the transient visible light anisotropic photoresponse of cobalt‐incorporated tungsten diselenide ternary alloy

Dye‐sensitized solar cells based on nickel‐doped tungsten diselenide counter electrodes

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi3TixNb2–xO9 Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

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Product

Resources

About

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity