A review on S-scheme and dual S-scheme heterojunctions for photocatalytic hydrogen evolution, water detoxification and CO2 reduction

Kumar, Amit; Khosla, Atul; Sharma, Sunil K.; Dhiman, Pooja; Sharma, Gaurav; Gnanasekaran, Lalitha; Naushad, Mu.; Stadler, Florian J.

doi:10.1016/j.fuel.2022.126267

Cited by 107 publications

(28 citation statements)

References 153 publications

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“…Alternatively, the novel model based on a S-scheme photocatalyst was proposed. 65 − 68 In this case, the charge separation and high redox ability are obtained. In theory, extended photo-absorption, excellent charge separation, and a strong redox potential are collectively gained.…”

Section: Resultsmentioning

confidence: 87%

“…To roughly compare the charge carrier separation efficiency in the prepared photocatalysts, the PL spectroscopic method was performed . According to the PL spectra in Figure c,d, the ZnO/BiVO 4 photocatalyst provided the lowest intensity in the PL spectra, compared to pristine components, implying the lowest charge carrier recombination rate found in this sample.…”

Section: Resultsmentioning

confidence: 99%

“…In principle, the advantages of extended photoabsorption, excellent charge separation, and strong redox potential are obtained. 65 − 68 …”

Section: Introductionmentioning

confidence: 99%

“…To study a heterojunction semiconductor, fabrication of a new heterostructure photocatalyst by coupling of two photocatalysts was introduced. It is well-known that both type II and Z-scheme heterojunctions have previously been proposed. , However, the electron transfer mechanism of a conventional Z-scheme photocatalyst faces some drawbacks so that the new model based on a step scheme or S-scheme photocatalyst with excellent charge separation and high redox ability was introduced. In principle, the advantages of extended photoabsorption, excellent charge separation, and strong redox potential are obtained. − …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

et al. 2023

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The preparation of novel sunlight active photocatalysts for complete removal of pollutants from aqueous solutions is a vital research topic in environmental protection. The present work reports the synthesis of a ZnO/BiVO4 S-scheme heterojunction photocatalyst for degradation of the reactive red dye and oxytetracycline antibiotic in wastewater. ZnO and BiVO4 were first fabricated by a hydrothermal technique, and then, the ZnO/BiVO4 heterostructure was synthesized using an ultrasonic route. An increase of the surface area, compared to that of ZnO, was found in ZnO/BiVO4. The enhancement of charge separation efficiency at the interface was obtained so that a remarkable enhancement of the photocatalytic performance was detected in the prepared heterojunction photocatalyst. Complete detoxification of harmful pollutants was achieved by using the economical solar energy. The removal of the pollutants follows the first-order reaction with the highest rate constant of 0.107 min–1. The stability of the prepared photocatalyst was detected after five cycles of use. The ZnO/BiVO4 S-scheme heterostructure photocatalyst still provides high photoactivity even after five times of use. Hydroxyl radicals play an important role in the removal of the pollutant. This work demonstrates a new route to create the step-scheme heterojunction with high photoactivity for complete removal of the toxic dye and antibiotic in the environment.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

“…In principle, the advantages of extended photoabsorption, excellent charge separation, and strong redox potential are obtained. 65 − 68 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

et al. 2023

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“…Moreover, the reserved electrons generated in the CB of MCN could be found to transfer to Pt nanoparticles aiming to reduce water to produce H 2 . Because of the matched band structure along with a good compatibility, an MCN/UCN isotype heterojunction with the support of Pt could create an S-scheme charge transfer mechanism, leading to strong redox ability and an increase in charge-carrier separation efficiency. As a result shown in Figure b, the combination of MCN/UCN with 1% Pt could improve the photocatalytic water-splitting efficiency by 5.5 and 1.8-times in comparison with the use of pure MCN and UCN, respectively .…”

Section: Photocatalyst Characteristicsmentioning

confidence: 99%

Hydrogen Production by Water Splitting with Support of Metal and Carbon-Based Photocatalysts

Hoang

Pandey

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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Hydrogen energy is environmental-friendly and considered an attractive alternative to fossil fuels. Among the feasible technologies for hydrogen generation, photocatalysis-derived hydrogen from water splitting is considered to be the optimal solution for meeting long-term sustainability and increased energy demands. In this context, various photocatalytic genres are proposed, with metal and carbon-supported photocatalysts demonstrating greater comprehensiveness and potential for addressing solar-driven hydrogen production from water. Several important aspects of the aforementioned photocatalytic genres are reviewed in the present work in an effort to provide pertinent researchers with new horizons for more advanced performance. The review is initiated by introducing the primary principles in photocatalysis, as well as the prerequisites for hydrogen generation from water. The focus then moves to metal-based photocatalysts, where the important features of these materials as photocatalysts are summarized. Related limitations are also discussed, along with the proposed strategies that could potentially mitigate them. Similar systematic summaries are made of knowledge on carbon-based photocatalysts. The review concludes with a discussion of potential future research directions in light of the bottlenecks currently encountered. With the proper research and development, metal-based and carbon-based photocatalysts could produce clean hydrogen from water, thereby fueling global development without causing environmental harm.

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Fabrication of S‐Scheme GDY‐CuI/ZnWO₄ Photocatalyst to Promote Electron Transfer for Enhanced Photocatalytic H₂ Evolution

Wang,

Xie

et al. 2024

Advanced Sustainable Systems

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The exceptional performance of graphdiyne (GDY) in photocatalysis for hydrogen evolution attracts much attention, but the narrow band gap of GDY complicates the effective realization of the dissociation between photogenerated charges and photogenerated holes. In this study, GDY‐CuI is synthesized by cross‐coupling method, and the wide bandgap ZnWO4 is introduced into it by low‐temperature mixing, which effectively constructed the GDY‐CuI/ZW‐50 double S‐scheme heterojunction. The optimized GDY‐CuI/ZW‐50 catalyst photocatalytic hydrogen evolution performance reached 308.61 µmol after 5 h of visible light irradiation, which is 12.86 and 6.56 times than that of GDY‐CuI and ZnWO4, respectively. The improved efficiency of hydrogen evolution is attributed to the formation of a double S‐scheme heterojunction between GDY, CuI, and ZnWO4 and an internal electric field, which promotes charge transfer, reduces the complexation rate of photogenerated electrons, and enhances the redox capacity of photogenerated charges. A combination of photoelectrochemical analysis, in situ X‐ray photoelectron spectroscopy (In situ XPS), ultraviolet photoelectron spectroscopy (UPS), and density functional theory (DFT) results revealed the electron transfer mechanism. This work will provide new ideas for the design and preparation of GDY‐based photocatalysts.

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A review on S-scheme and dual S-scheme heterojunctions for photocatalytic hydrogen evolution, water detoxification and CO2 reduction

Cited by 107 publications

References 153 publications

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Hydrogen Production by Water Splitting with Support of Metal and Carbon-Based Photocatalysts

Fabrication of S‐Scheme GDY‐CuI/ZnWO₄ Photocatalyst to Promote Electron Transfer for Enhanced Photocatalytic H₂ Evolution

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A review on S-scheme and dual S-scheme heterojunctions for photocatalytic hydrogen evolution, water detoxification and CO2 reduction

Cited by 107 publications

References 153 publications

Ultrasound-Assisted Synthesis of a ZnO/BiVO4 S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Ultrasound-Assisted Synthesis of a ZnO/BiVO4 S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Hydrogen Production by Water Splitting with Support of Metal and Carbon-Based Photocatalysts

Fabrication of S‐Scheme GDY‐CuI/ZnWO4 Photocatalyst to Promote Electron Transfer for Enhanced Photocatalytic H2 Evolution

Contact Info

Product

Resources

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Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Fabrication of S‐Scheme GDY‐CuI/ZnWO₄ Photocatalyst to Promote Electron Transfer for Enhanced Photocatalytic H₂ Evolution