Quantum dots as enhancer in photocatalytic hydrogen evolution: A review

Kandi, Debasmita; Martha, Satyabadi; Parida, Kulamani

doi:10.1016/j.ijhydene.2017.02.166

Cited by 117 publications

(56 citation statements)

References 152 publications

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“…With the increment of CNNS amount in the Co 3 O 4 /CNNS composites, the peak intensities of the CNNS increase with decreasing Co 3 O 4 intensities. Moreover, the crystallite size of Co 3 O 4 QDs is calculated to be 2.6 nm, according to the Scherrer equation and the prominent (311) diffraction peak, which is smaller than its excitonic Bohr radius (≈5–6 nm) …”

Section: Resultsmentioning

confidence: 88%

“…Moreover, the crystallite size of Co 3 O 4 QDs is calculated to be 2.6 nm, according to the Scherrer equation and the prominent (311) diffraction peak, which is smaller than its excitonic Bohr radius (≈5-6 nm). [55,56] The chemical structures of the Co 3 O 4 /CNNS composites were also studied by Fourier transform infrared (FTIR) ( Figure 2B). For pristine CNNS, the broad peaks ranging from ≈3000 to 3500 cm −1 belong to the NH band and OH stretches, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Strongly Coupled g‐C₃N₄ Nanosheets‐Co₃O₄ Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation

Gao

Yang

et al. 2018

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308

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The development of effective approaches for the preparation of 0D quantum dots (QDs)/2D nanosheets (NSs) heterostructures, which have been proven to be favorable for heterogeneous catalysis, is highly desirable but remains a great challenge. Herein, 0D metal oxide nanocrystals-2D ultrathin g-C N nanosheets (Co O /CNNS) heterostructures are synthesized via a facile chemical reaction, followed by annealing in air. Ultrafine Co O QDs (≈2.2-3.2 nm) are uniformly and tightly attached on the surface of g-C N nanosheets. Detailed characterization reveals that the specially designed unique 0D/2D structure is critical to the high photocatalytic performance for the degradation of tetracycline (TC) via peroxymonosulfate (PMS) activation. The optimal catalyst, namely, Co O /CNNS-1100, exhibits excellent performance and ≈98.7% TC can be degraded under visible light irradiation. Moreover, TC degradation is almost completely insusceptible to several real water samples. Meanwhile, other dye pollutants can also be efficiently degraded by the Co O /CNNS-1100/PMS/vis system. The quenching tests display that that the h , ∙OH, O , and SO are responsible for TC removal. The improved photocatalytic performance can be attributed to the synergistic effect of the photocatalytic- and chemical-processes in the PMS activation. This work gives an insight into the development of multifunctional 0D/2D nanocomposites for further potential applications which are not limited to environmental purification.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Strongly Coupled g‐C₃N₄ Nanosheets‐Co₃O₄ Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation

Gao

Yang

et al. 2018

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308

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“…More recently, interesting reviews have addressed separately each of the three system categories but there is no integrated and comparative analysis of the three systems. The present review provides such an integrated overview of the photocatalytic generation of H 2 , and the influence of the photocatalytic units and process variables on H 2 production rate and stability.…”

Section: State Of the Art Of Photocatalytic Generation Of Hydrogenmentioning

confidence: 99%

“…Recently, quantum dots have been proposed as attractive materials with enhanced performance in the generation of H 2 . Particles with diameters between 1 and 10 nm exhibit better charge transport and separation properties than conventional nanoparticles …”

Section: Influence Of System Units On Photocatalytic Performancementioning

confidence: 99%

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Corredor

Rivero

Rangel

et al. 2019

J of Chemical Tech & Biotech

172

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Hydrogen represents a renewable energy alternative that may positively contribute to get over the global energy crisis while at the same time reducing its environmental burden. Overcoming the challenge of reaching this potential could be helped by careful choice of hydrogen (H2) sources. Photocatalytic generation of H2, although a minor alternative, appears to be a very good option at the time that liquid wastes are being degraded; therefore, this approach has given rise to an increasing number of interesting studies. Here, we aim to provide an integrated overview of the different photocatalytic, heterogeneous, homogeneous and hybrid systems. First, we categorize the units and mechanisms that take part in the photocatalytic process, and secondly we analyze their role and draw comparative conclusions. Thus, we analyze the role of (i) the electron source to carry out proton reduction, (ii) the proton source, which can be free protons in the medium or a proton donor compound, (iii) the catalyst nature and concentration, and (iv) the photosensitizer nature and concentration. We also provide an analysis of the influence of the solvent, especially in homogenous systems as well as the influence of pH. We provide a comparison of the photocatalytic performance, highlighting the advantages and disadvantages, of different systems. Thus, this review is, on the one hand, an update on the state of the art of photocatalytic generation of H2 from a full perspective that integrates homogeneous, heterogeneous and hybrid systems, and, on the other, a source of useful information for future research. © 2019 Society of Chemical Industry

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“…Quantum size effect of nanocrystal comparing to the electrochemical potential. [126] conductor nanocrystals in aforementioned stimulating applications: 1. Although there are some progresses in the syntheses of ZnSe/ZnS and ZnTe/ZnS core/shell structures, achieving good luminescence quantum efficiency in these materials is still challenging because of the interfacial defects and strains.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Recent Advances in Zinc‐Containing Colloidal Semiconductor Nanocrystals for Optoelectronic and Energy Conversion Applications

et al. 2019

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Colloidal semiconductor nanocrystals (NCs), especially cadmium (Cd)‐ and lead (Pb)‐containing ones, have been proved to be the promising materials for photoelectronic energy conversion applications. However, the high toxicity and cost of these materials restrict their widespread use. Zinc (Zn)‐containing colloidal semiconductor NCs are non‐/less toxic and environmentally friendly materials, manifesting in stimulating optical and electronic properties with relevance to a broad scope of applications including light‐emitting diodes (LEDs), sensors, photocatalysts, and more. In this Review, we elaborate on the shape control of Zn‐containing colloidal semiconductor NCs achieved by a variety of wet‐chemical synthetic approaches. Moreover, the formation of core‐shell, doped, and hybrid structures based on Zn‐containing colloidal semiconductor NCs allow for the optimization of their functionalities, which underpin stimulating photoelectronic energy conversion applications in quantum‐dot LEDs (QLEDs), photodetectors, and photocatalysis. Zn‐containing colloidal semiconductor NCs that combine the green chemistry with sustainable developments possess a bright future.

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Quantum dots as enhancer in photocatalytic hydrogen evolution: A review

Cited by 117 publications

References 152 publications

Strongly Coupled g‐C₃N₄ Nanosheets‐Co₃O₄ Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation

Strongly Coupled g‐C₃N₄ Nanosheets‐Co₃O₄ Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Recent Advances in Zinc‐Containing Colloidal Semiconductor Nanocrystals for Optoelectronic and Energy Conversion Applications

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Quantum dots as enhancer in photocatalytic hydrogen evolution: A review

Cited by 117 publications

References 152 publications

Strongly Coupled g‐C3N4 Nanosheets‐Co3O4 Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation

Strongly Coupled g‐C3N4 Nanosheets‐Co3O4 Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Recent Advances in Zinc‐Containing Colloidal Semiconductor Nanocrystals for Optoelectronic and Energy Conversion Applications

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Strongly Coupled g‐C₃N₄ Nanosheets‐Co₃O₄ Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation

Strongly Coupled g‐C₃N₄ Nanosheets‐Co₃O₄ Quantum Dots as 2D/0D Heterostructure Composite for Peroxymonosulfate Activation