Enhanced solar light driven hydrogen generation and environment remediation through Nd incorporated ZnIn2S4

Janani, R.; Priyanga, G. Sudha; Behara, Santosh; Melvin, Ambrose A.; Neppolian, B.; Thomas, Tiju; Neppolian, Bernaurdshaw; Singh, Shubra

doi:10.1016/j.renene.2020.09.081

Cited by 25 publications

(10 citation statements)

References 59 publications

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“…In this scenario, elemental doping has emerged to be an effective strategy to improve the photocatalytic activity by surface modification and tuning the electronic structure . Various metallic cations like Cu 2+ , Ni 2+ , and so on − are being doped to enhance the light absorption range, which helps in the improvement of photocatalytic activity. However, there is a probability of trapping the photoinduced charge carriers in the metal centers as well, which can diminish the photocatalytic yield .…”

mentioning

confidence: 99%

Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic Activity

Goswami¹,

Yadav²,

Bhatt³

et al. 2021

J. Phys. Chem. Lett.

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Elemental doping has already been established to be one of the most effective approaches for band-gap engineering and controlled material response for improved photocatalytic activity. Herein atomically thin ZnIn2S4 (ZIS) nanosheets were doped with O and N separately, and the effects of doping were spectroscopically investigated for photocatalytic H2 evolution. Steady-state photoluminescence studies revealed an enhanced charge-carrier population in the doped systems along with a defect-state-induced broad peak in the red region of the spectra. Transient absorption (TA) spectroscopy demonstrated that the conduction-band-edge electrons are transferred on an ultrafast time scale to the inter-band-gap defect states. TA analysis suggests that O and N doping contributes to the defect state concentration and ensures an enhanced photocatalytic activity of the system. This detailed spectroscopic analysis uncovers the role of inter-band-gap defect states in the photocatalytic activity of ZIS and will open new avenues for the construction of nanosheet-based optical devices.

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mentioning

confidence: 99%

Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic Activity

Goswami¹,

Yadav²,

Bhatt³

et al. 2021

J. Phys. Chem. Lett.

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“…The peak at 125 cm À 1 confirms the layered structure of ZnIn 2 S 4 . [37][38][39] The Raman peaks of InO x appear at 364 cm À 1 and 484 cm À 1 , which can be attributed to the stretching vibrations mode of the In-O-In and the stretching vibrations of ν(InO 6 ) octahedrons. [36,40] The post-hydrolysis treatment changed the surface composition and electronic structure as shown by the X-ray photoelectron spectroscopy (XPS) characterization (Figure S3 and Figure 1g-i).…”

Section: Resultsmentioning

confidence: 99%

Hydrolysis‐Induced InO_x on ZnIn₂S₄ Promotes Selective CO₂ Photoreduction over H₂ Evolution

et al. 2022

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Metal sulfides generally show high visible light photocatalytic activity, but lower selectivity in the CO2 photoreduction due to the competitive hydrogen evolution. Here, a partial hydrolysis method is reported to promote the selective photocatalytic CO2 reduction over ZnIn2S4. The ZnIn2S4 was post‐hydrolyzed in an aqueous ammonia solution to form oxide species (ZIS‐[InOx]). Detailed experiment and DFT calculation demonstrated that the post‐hydrolysis treatment facilely prohibits the recombination of photogenerated charge carriers and benefits CO2 activation. Under visible light irradiation, the ZIS‐[InOx] photocatalyst shows enhanced CO2‐to‐CO conversion activity with a CO‐evolving rate of 1771 μmol g−1 h−1, which is about 8 times higher than that over pristine ZIS and 3.5 times higher than that over bulk ZIS/In2O3. More importantly, the post hydrolysis treatment significantly prohibits the hydrogen evolution and increases the CO/H2 ratio from 0.08 over ZIS to 1.8 over ZIS‐[InOx]. This work provides a new strategy to prepare catalysts for photocatalytic CO2 reduction.

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“…The rhombohedral phase exhibits a strong Zn-S and In-S bond in the layer with a weaker S-S bond, with every S atom corresponding to a different layer [66]. The band structure of ZnIn2S4 has also been explored theoretically on the basis of Density Functional Theory (DFT) [55,64,67,68]. Studies suggest that ZnIn2S4 is a direct bandgap semiconductor as both VB and CB of ZnIn2S4 lie on G point of thee Brillouin zone [55].…”

Section: Crystalline Structures Of Sulfide Based Photocatalystsmentioning

confidence: 99%

“…Doping is generally considered a common strategy in boosting up the spectral response of a semiconductor. Commonly, doping an element into a semiconductor could narrow the bandgap and enhance the light-absorption ability [63,68]. Owing to the special electronic configuration of rare earth elements (REEs) with vacant f orbital, doping of rareearth ions has attracted research interest in the field of photocatalysis.…”

Section: Doping As a Strategy To Enhance Photocatalysismentioning

confidence: 99%

Hierarchical Ternary Sulfides as Effective Photocatalyst for Hydrogen Generation Through Water Splitting: A Review on the Performance of ZnIn2S4

et al. 2021

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One of the major aspects and advantages of solar energy conversion is the photocatalytic hydrogen generation using semiconductor materials for an eco-friendly technology. Designing a low-cost efficient material to overcome limited light absorption as well as rapid recombination of photogenerated charge carriers is essential to achieve considerable hydrogen generation. In recent years, sulfide based semiconductors have attracted scientific research interest due to their excellent solar response and narrow band gap. The present review focuses on the recent approaches in the development of hierarchical ternary sulfide based photocatalysts with a special focus on ZnIn2S4. We also observe how the electronic structure of ZnIn2S4 is beneficial for water splitting and the various strategies involved for improving the material efficiency for photocatalytic hydrogen generation. The review places emphasis on the latest advancement/new insights on ZnIn2S4 being used as an efficient material for hydrogen generation through photocatalytic water splitting. Recent progress on essential aspects which govern light absorption, charge separation and transport are also discussed in detail.

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Enhanced solar light driven hydrogen generation and environment remediation through Nd incorporated ZnIn2S4

Cited by 25 publications

References 59 publications

Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic Activity

Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic Activity

Hydrolysis‐Induced InO_x on ZnIn₂S₄ Promotes Selective CO₂ Photoreduction over H₂ Evolution

Hierarchical Ternary Sulfides as Effective Photocatalyst for Hydrogen Generation Through Water Splitting: A Review on the Performance of ZnIn2S4

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Enhanced solar light driven hydrogen generation and environment remediation through Nd incorporated ZnIn2S4

Cited by 25 publications

References 59 publications

Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn2S4 Nanosheets for Enhanced Photocatalytic Activity

Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn2S4 Nanosheets for Enhanced Photocatalytic Activity

Hydrolysis‐Induced InOx on ZnIn2S4 Promotes Selective CO2 Photoreduction over H2 Evolution

Hierarchical Ternary Sulfides as Effective Photocatalyst for Hydrogen Generation Through Water Splitting: A Review on the Performance of ZnIn2S4

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Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic Activity

Defect-Mediated Slow Carrier Recombination and Broad Photoluminescence in Non-Metal-Doped ZnIn₂S₄ Nanosheets for Enhanced Photocatalytic Activity

Hydrolysis‐Induced InO_x on ZnIn₂S₄ Promotes Selective CO₂ Photoreduction over H₂ Evolution