A study on the transfer of photo-excited charge carriers within direct and inverted type-I heterojunctions of CdS and ZnS QDs

2018 ◽  
Vol 42 (12) ◽  
pp. 9808-9818 ◽  
Author(s):  
Abdolraouf Samadi-Maybodi ◽  
Mohammad Reza Shariati
Keyword(s):  
Wave Function ◽  
Charge Carrier ◽  
Charge Carriers ◽  
P Wave ◽  
Core Shell ◽  
Type I ◽  
Solar Photocatalysis ◽  
Fast Charge ◽  
Carrier Separation

Wave function engineering for fast charge carrier separation/slow recombination in reverse type-I core/shell QDs for solar photocatalysis.

scholarly journals Isopropanol-assisted synthesis of highly stable MAPbBr3/p-g-C3N4 intergrowth composite photocatalysts and their interfacial charge carrier dynamics

2020 ◽  
Vol 2 (1) ◽  
pp. 274-285 ◽  
Author(s):  
Qun Wang ◽  
Sicao Yu ◽  
Wei Qin ◽  
Xiaohong Wu
Keyword(s):  
Charge Transfer ◽  
Charge Carrier ◽  
Molecular Oxygen ◽  
Oxygen Activation ◽  
Carrier Dynamics ◽  
Core Shell ◽  
Type I ◽  
Charge Carrier Dynamics ◽  
Composite Photocatalysts ◽  
Interfacial Charge

Isopropanol-assisted synthesis MAPbBr3 wrapped/entrapped p-g-C3N4 intergrowth microcrystals have inverted type-I core/shell band configuration which leads to enhanced interfacial charge transfer and molecular oxygen activation.

scholarly journals Facile Synthesis Bi2Te3 Based Nanocomposites: Strategies for Enhancing Charge Carrier Separation to Improve Photocatalytic Activity

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3390
Author(s):  
Di Wu ◽  
Jun Guo ◽  
Zhen-Hua Ge ◽  
Jing Feng
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Charge Carriers ◽  
Core Shell ◽  
Facile Synthesis ◽  
Shell Nanostructures ◽  
Carrier Separation ◽  
The Stability ◽  
Nanocomposite Powders ◽  
Decomposition Efficiency

Varying structure Bi2Te3-based nanocomposite powders including pure Bi2Te3, Bi2Te3/Bi core−shell, and Bi2Te3/AgBiTe2 heterostructure were synthesized by hydrothermal synthesis using Bi2S3 as the template and hydrazine as the reductant. Successful realization of Bi2Te3-based nanostructures were concluded from XRD, FESEM, and TEM. In this work, the improvement in the performance of the rhodamine B (RhB) decomposition efficiency under visible light was discussed. The Bi2Te3/AgBiTe2 heterostructures revealed propitious photocatalytic performance ca. 90% after 60 min. The performance was over Bi2Te3/Bi core-shell nanostructures (ca. 40%) and more, exceeding pure Bi2Te3 (ca. 5%). The reason could be scrutinized in terms of the heterojunction structure, improving the interfacial contact between Bi2Te3 and AgBiTe2 and enabling retardation in the recombination rate of the photogenerated charge carriers. A credible mechanism of the charge transfer process in the Bi2Te3/AgBiTe2 heterostructures for the decomposition of an aqueous solution of RhB was also explicated. In addition, this work also investigated the stability and recyclability of a Bi2Te3/AgBiTe2 heterojunction nanostructure photocatalyst. In addition, this paper anticipates that the results possess broad potential in the photocatalysis field for the design of a visible light functional and reusable heterojunction nanostructure photocatalyst.

scholarly journals Tunable plasmonic core–shell heterostructure design for broadband light driven catalysis

2018 ◽  
Vol 9 (48) ◽  
pp. 8914-8922 ◽  
Author(s):  
Chuang Han ◽  
Shao-Hai Li ◽  
Zi-Rong Tang ◽  
Yi-Jun Xu
Keyword(s):  
Optical Absorption ◽  
Charge Carrier ◽  
Light Absorption ◽  
Core Shell ◽  
Absorption Models ◽  
Carrier Separation

A tunable core–shell heterostructure design coupling two conceptually different optical absorption models for improved broadband light absorption and hot charge carrier separation toward plasmon-mediated photocatalysis.

Gold nanoparticle decorated bismuth sulfide nanorods for enhanced photoelectrochemical hydrogen production

2019 ◽  
Vol 7 (21) ◽  
pp. 6398-6405 ◽  
Author(s):  
Palyam Subramanyam ◽  
T. Vinodkumar ◽  
Melepurath Deepa ◽  
Ch. Subrahmanyam
Keyword(s):  
Hydrogen Production ◽  
Charge Carrier ◽  
Gold Nanoparticle ◽  
Light Absorption ◽  
Hydrogen Generation ◽  
Bismuth Sulfide ◽  
Fast Charge ◽  
Carrier Separation ◽  
Photoelectrochemical Hydrogen Production

The design of photo-electrodes with good light absorption, effective photo-generated charge carrier separation and fast charge transportation are key parameters for photoelectrochemical (PEC) hydrogen generation.

Lead-Free Metal Halide Perovskite Nanocrystals for Photocatalysis in Water

2019 ◽  
Author(s):  
Subhajit Bhattacharjee ◽  
Sonu Pratap Chaudhary ◽  
Sayan Bhattacharyya
Keyword(s):  
Charge Carrier ◽  
Wide Spectrum ◽  
Real Life ◽  
Metal Halide ◽  
Lead Free ◽  
Water Medium ◽  
Type I ◽  
Type Ii ◽  
Perovskite Layer ◽  
Halide Perovskites

<p>Metal halide perovskites with high absorption coefficient, direct generation of free charge carriers, excellent ambipolar charge carrier transport properties, point-defect tolerance, compositional versatility and solution processability are potentially transforming the photovoltaics and optoelectronics industries. However their limited ambient stability, particularly those of iodide perovskites, obscures their use as photocatalysts especially in aqueous medium. In an unprecedented approach we have exploited the photo-absorption property of the less toxic lead-free Cs<sub>3</sub>Bi<sub>2</sub>X<sub>9 </sub>(X = Br, I) nanocrystals (NCs) to catalyse the degradation of water pollutant organic dye, methylene blue (MB) in presence of visible light at room temperature. After providing a proof-of-concept with bromide perovskites in isopropanol, the perovskites are employed as photocatalysts in water medium by designing perovskite/Ag<sub>2</sub>S and perovskite/TiO<sub>2 </sub>composite systems, with Type I (or quasi Type II) and Type II alignments, respectively. Ag<sub>2</sub>S and TiO<sub>2</sub> coatings decelerate penetration of water into the perovskite layer while facilitating charge carrier extraction. With a minimal NC loading, Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>/Ag<sub>2</sub>S degrades ~90% MB within an hour. Our approach has the potential to unravel the photocatalytic properties of metal halide perovskites for a wide spectrum of real-life applications. </p>

On the mechanism of photocatalytic reactions on CuxO@TiO2 core-shell photocatalyst

2021 ◽  
Author(s):  
Kunlei Wang ◽  
Zuzanna Bielan ◽  
M. Ando ◽  
Marcin Janczarek ◽  
Dong Zhang ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Environmental Applications ◽  
Core Shell ◽  
Highly Active ◽  
Photocatalytic Reactions

Titania (titanium(IV) oxide) is highly active, stable, cheap and abundant photocatalyst, and thus commonly applied in various environmental applications. However, two main shortcomings of titania, i.e., charge carriers’ recombination and...

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