Strongly coupled CdX (X S, Se and Te) quantum dots/TiO2 nanocomposites for photocatalytic degradation of benzene under visible light irradiation

Hua, Jianhao; Wang, Meng; Jiao, Yang; Li, Hong; Yang, Yaling

doi:10.1016/j.ijleo.2018.06.049

Cited by 18 publications

(11 citation statements)

References 41 publications

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“…The high-resolution Cd 3d XPS spectrum displayed two individual peaks of Cd 3d 5/2 and Cd 3d 3/2 at 404.8 and 411.5 eV, corresponding to the Cd 2+ species in CdS. The deconvoluted peaks of the S 2p 3/2 and S 2p 1/2 signals located at 161.4 and 162.7 eV indicate the presence of S 2– in CdS . As for the rTNTAs60CdSe sample, similar results were obtained.…”

Section: Results and Discussionsupporting

confidence: 73%

“…The peak intensity of TiO 2 decreased significantly after reducing in a 5% H 2 atmosphere at 400 °C, reflecting the decreased crystallinity due to lattice disorder by the formation of intrinsic defects, as will be further discussed later. After being combined with CdX (X = S or Se), the XRD patterns do not show the characteristic peaks of CdX, most probably due to the low concentration and the small crystal size of the chalcogenide phases . For reference purposes, the XRD patterns of TNTAs30 after reduction and combination with CdX are presented in Figure S1.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Additionally, coupling TiO 2 with a narrow bandgap semiconductor as a sensitizing agent can further extend the light absorption in the visible region. TiO 2 /CdS and TiO 2 /CdSe are typical nanocomposite systems with the optical response region encompassing nearly all of the visible and UV regions . Semiconducting NPs of CdS and CdSe with their tunable bandgaps provide opportunities for harvesting the visible and even infrared regions of solar light.…”

Section: Introductionmentioning

confidence: 99%

“…TiO 2 /CdS and TiO 2 / CdSe are typical nanocomposite systems with the optical response region encompassing nearly all of the visible and UV regions. 18 Semiconducting NPs of CdS and CdSe with their tunable bandgaps provide opportunities for harvesting the visible and even infrared regions of solar light. Based on the bulk energy values, the CB of TiO 2 is at −0.5 V vs NHE, while for CdS and CdSe, the CB values are around −0.73 and −0.8 V vs NHE, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

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Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles

Kang

Chaperman

Galeckas

et al. 2021

ACS Appl. Mater. Interfaces

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In this study, polyol-made CdS and CdSe crystalline nanoparticles (NPs) are loaded by impregnation on TiO 2 nanotube arrays (TNTAs) for solar-simulated light-driven photoelectrochemical (PEC) water vapor splitting. For the first time, we introduce a safe way to utilize toxic, yet efficient photocatalysts by integration in solid-state PEC (SSPEC) cells. The enabling features of SSPEC cells are the surface protonic conduction mechanism on TiO 2 and the use of polymeric electrolytes, such as Nafion instead of liquid ones, for operation with gaseous reactants, like water vapor from ambient humidity. Herein, we studied the effects of both the operating conditions in gaseous ambient atmospheres and the surface modifications of TNTAs-based photoanodes with well-crystallized CdS and CdSe NPs. We showed 3.6 and 2.5 times increase in the photocurrent density of defective TNTAs modified with CdS and CdSe, respectively, compared to the pristine TNTAs. Electrochemical impedance spectroscopy and structural characterizations attributed the improved performance to the higher conductivity induced by intrinsic defects as well as to the enhanced electron/hole separation at the TiO 2 /CdS heterojunction under gaseous operating conditions. The SSPEC cells were evaluated by cycling between high relative humidity (RH) (80%) and low RH levels (40%), providing direct evidence of the effect of RH and, in turn, adsorbed water, on the cell performance. Online mass spectrometry indicated the corresponding difference in the H 2 production rate. In addition, a complete restoration of the SSPEC cell performance from low to high RH levels was also achieved. The presented system can be employed in off-grid, water depleted, and air-polluted areas for the production of hydrogen from renewable energy and provides a solution for the safe use of toxic, yet efficient photocatalysts.

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Section: Results and Discussionsupporting

confidence: 73%

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles

Kang

Chaperman

Galeckas

et al. 2021

ACS Appl. Mater. Interfaces

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“…A wide variety of semiconductor photocatalysts has been investigated so far, such as chalcogenides (ZnS, CdS, CdSe), metal oxides (TiO 2 , Cu 2 O, ZrO 2 ), carbonaceous materials (g‐C 3 N 4 ) and solid solutions [(Ga 1‐x Zn x )(N 1‐x O x ), (AgIn) x Zn 2(1‐x) S 2 ] . However, TiO 2 is still the most widely used photocatalyst because of its good stability in a wide range of pH conditions, resistance to photo‐corrosion, nontoxicity and commercial availability.…”

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

159

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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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Transition Metal Chalcogenides-Based Nanocomposite for the Photocatalytic Degradation of Hazardous Chemicals

Gaur

2023

Advances in Material Research and Technology

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Strongly coupled CdX (X S, Se and Te) quantum dots/TiO2 nanocomposites for photocatalytic degradation of benzene under visible light irradiation

Cited by 18 publications

References 41 publications

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Transition Metal Chalcogenides-Based Nanocomposite for the Photocatalytic Degradation of Hazardous Chemicals

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Strongly coupled CdX (X S, Se and Te) quantum dots/TiO2 nanocomposites for photocatalytic degradation of benzene under visible light irradiation

Cited by 18 publications

References 41 publications

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO2 Nanotubes Loaded with CdS and CdSe Nanoparticles

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO2 Nanotubes Loaded with CdS and CdSe Nanoparticles

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Transition Metal Chalcogenides-Based Nanocomposite for the Photocatalytic Degradation of Hazardous Chemicals

Contact Info

Product

Resources

About

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles