First demonstration of CdSe as a photocatalyst for hydrogen evolution from water under UV and visible light

Frame, F. Andrew; Carroll, Elizabeth C.; Larsen, Delmar S.; Sarahan, Mike; Browning, Nigel D.; Osterloh, Frank E.

doi:10.1039/b718796c

Cited by 127 publications

(22 citation statements)

References 29 publications

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“…Therefore, another strategy is to use low band gap semiconductor materials (CdS and CdSe nanoparticles, etc. ) − for visible light photocatalytic H 2 generation. Several visible light capturing semiconducting nanomaterials, i.e., heterostructures, alloys, and core–shell nanostructures such as TiO 2 –CdS, TiO 2 –Pt, CdS–Pt, Zn 1– x Cd x S, Cu(OH) 2 /TiO 2 , Cu 2 MoS 4 , CdS–PdX, NiO x –SrTiO 3 , reduced graphene oxide–Zn 1– x Cd x S, MoS 2 –graphene/TiO 2 , CdS–graphene–Pt, TiO 2 –CdS–Pt, CdSe–MoS 2 , Fe 3 O 4 , Co 3 O 4 , are found to be effective for efficient H 2 generation. ,− In addition to these systems, the use of two-dimensional (2D) semiconductor nanostructures is another strategy for hydrogen generation.…”

Section: Qd-based Light-harvesting Systemsmentioning

confidence: 99%

Nanoscale Strategies for Light Harvesting

2016

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Recent advances and the current status of challenging light-harvesting nanomaterials, such as semiconducting quantum dots (QDs), metal nanoparticles, semiconductor-metal heterostructures, π-conjugated semiconductor nanoparticles, organic-inorganic heterostructures, and porphyrin-based nanostructures, have been highlighted in this review. The significance of size-, shape-, and composition-dependent exciton decay dynamics and photoinduced energy transfer of QDs is addressed. A fundamental knowledge of these photophysical processes is crucial for the development of efficient light-harvesting systems, like photocatalytic and photovoltaic ones. Again, we have pointed out the impact of the metal-nanoparticle-based surface energy transfer process for developing light-harvesting systems. On the other hand, metal-semiconductor hybrid nanostructures are found to be very promising for photonic applications due to their exciton-plasmon interactions. Potential light-harvesting systems based on dye-doped π-conjugated semiconductor polymer nanoparticles and self-assembled structures of π-conjugated polymer are highlighted. We also discuss the significance of porphyrin-based nanostructures for potential light-harvesting systems. Finally, the future perspective of this research field is given.

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Section: Qd-based Light-harvesting Systemsmentioning

confidence: 99%

Nanoscale Strategies for Light Harvesting

2016

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“…Using a narrow bandgap semiconductor like CdS, visible light can be used to generate H 2 from water, but the activity is low or often the material is unstable . Using coloured semiconductors such as CdSe, TaON, Ta 3 N 5 and graphitic C 3 N 4 , H 2 can be photocatalytically generated from water . Using a single semiconductor photocatalyst alone is not efficient, hence modification of the material is essential.…”

Section: The Generation Of Hydrogen With Semiconductors and Dyesmentioning

confidence: 99%

Generation of Hydrogen by Visible Light‐Induced Water Splitting with the Use of Semiconductors and Dyes

Rao

2015

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Photosynthesis that occurs in plants involves both the oxidation of water and the reduction of carbon dioxide. Plants carry out these reactions with ease, by involving electron-transport chains. In this article, hydrogen generation by the reduction of water in the laboratory by using semiconductor nanostructures through artificial photosynthesis is examined. Dye-sensitized photochemical generation of hydrogen from water is also discussed. Hydrogen generation by these means has great technological relevance, since it is an environmentally friendly fuel. The way in which oxygen can be generated by the oxidation of water using metal oxide catalysts is also shown.

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“…In this regard, a variety of nanoscale semiconductors with narrow bandgap energy, including metal oxides (BiVO 4 , Fe 2 O 3 , CuO, and WO 3 ), − metal chalcogenides (CdS, CdSe, CuInS, and PbS), − carbonaceous materials (graphene and its composite), , and polymer-like materials (g-C 3 N 4 ), , have been developed as photocatalysts for treatment of pollutants in wastewater and for producing hydrogen. Among these, semiconductor quantum dots (QDs) with sizes between 1 and 10 nm exhibit great potential in harvesting sunlight over a broad spectral range due to their large extinction coefficients and high surface-to-volume ratios.…”

Section: Introductionmentioning

confidence: 99%

Biofunctionalized CdS Quantum Dots: A Case Study on Nanomaterial Toxicity in the Photocatalytic Wastewater Treatment Process

Shivaji¹,

Sridharan

Kirubakaran³

et al. 2023

ACS Omega

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The toxic nature of inorganic nanostructured materials as photocatalysts is often not accounted for in traditional wastewater treatment reactions. Particularly, some inorganic nanomaterials employed as photocatalysts may release secondary pollutants in the form of ionic species that leach out due to photocorrosion. In this context, this work is a proof-of-concept study for exploring the environmental toxicity effect of extremely smallsized nanoparticles (<10 nm) like quantum dots (QDs) that are employed as photocatalysts, and in this study, cadmium sulfide (CdS) QDs are chosen. Typically, CdS is an excellent semiconductor with suitable bandgap and band-edge positions that is attractive for applications in solar cells, photocatalysis, and bioimaging. However, the leaching of toxic cadmium (Cd 2+ ) metal ions due to the poor photocorrosion stability of CdS is a matter of serious concern. Therefore, in this report, a cost-effective strategy is devised for biofunctionalizing the active surface of CdS QDs by employing tea leaf extract, which is expected to hinder photocorrosion and prevent the leaching of toxic Cd 2+ ions. The coating of tea leaf moieties (chlorophyll and polyphenol) over the CdS QDs (referred to hereafter as G-CdS QDs) was confirmed through structural, morphological, and chemical analysis. Moreover, the enhanced visible-light absorption and emission intensity of G-CdS QDs in comparison to that of C-CdS QDs synthesized through a conventional chemical synthesis approach confirmed the presence of chlorophyll/polyphenol coating. Interestingly, the polyphenol/chlorophyll molecules formed a heterojunction with CdS QDs and enabled the G-CdS QDs to exhibit enhanced photocatalytic activity in the degradation of methylene blue dye molecules over C-CdS QDs while effectively preventing photocorrosion as confirmed from cyclic photodegradation studies. Furthermore, detailed toxicity studies were conducted by exposing zebrafish embryos to the as-synthesized CdS QDs for 72 h. Surprisingly, the survival rate of the zebrafish embryos exposed to G-CdS QDs was equal to that of the control, indicating a significant reduction in the leaching of Cd 2+ ions from G-CdS QDs in comparison to C-CdS QDs. The chemical environment of C-CdS and G-CdS before and after the photocatalysis reaction was examined by X-ray photoelectron spectroscopy. These experimental findings prove that biocompatibility and toxicity could be controlled by simply adding tea leaf extract during the synthesis of nanostructured materials, and revisiting green synthesis techniques can be beneficial. Furthermore, repurposing the discarded tea leaves may not only facilitate the control of toxicity of inorganic nanostructured materials but can also help in enhancing global environmental sustainability.

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First demonstration of CdSe as a photocatalyst for hydrogen evolution from water under UV and visible light

Abstract: CdSe nanoribbons show catalytic activity for photochemical hydrogen evolution from aqueous Na2S/Na2SO3 solution under irradiation with ultraviolet and visible light.

Cited by 127 publications

References 29 publications

Nanoscale Strategies for Light Harvesting

Nanoscale Strategies for Light Harvesting

Generation of Hydrogen by Visible Light‐Induced Water Splitting with the Use of Semiconductors and Dyes

Biofunctionalized CdS Quantum Dots: A Case Study on Nanomaterial Toxicity in the Photocatalytic Wastewater Treatment Process

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