Spatial charge separation and high-index facet dependence in polyhedral Cu2O type-II surface heterojunctions for photocatalytic activity enhancement

2021 ◽  
Author(s):  
Xin Zhang ◽  
Shaodong Sun ◽  
Jie Cui ◽  
Man Yang ◽  
Qiao Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Separation ◽  
High Index ◽  
Type Ii ◽  
Efficient Strategy ◽  
Spatial Charge ◽  
Activity Enhancement

Surface heterojunction engineering has been demonstrated to be an efficient strategy for the spatial charge separation of photocatalysts. As a consequence, the improved photocatalytic activity is highly determined by the...

scholarly journals One-pot construction of robust BiOCl/ZnO p-n heterojunctions with semi-coherent interfaces toward improving charge separation for photodegradation enhancement

2021 ◽  
Author(s):  
Xiaoli Yang ◽  
Shaodong Sun ◽  
Jie Cui ◽  
Man Yang ◽  
Qing Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Separation ◽  
Stability Limit ◽  
Effective Strategy ◽  
One Pot ◽  
Interface Interaction ◽  
The Poor ◽  
Spatial Charge ◽  
Coherent Interfaces

Heterojunction engineering is an effective strategy to enhance photodegradation activity via improving the spatial charge separation. However, the poor interface interaction and stability limit the photocatalytic activity of traditional heterojunction....

scholarly journals Enhanced Photocatalytic Activity of BiVO4/Bi2S3/SnS2 Heterojunction under Visible Light

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1294
Author(s):  
Sopheak Meng ◽  
Takaya Ogawa ◽  
Hideyuki Okumura ◽  
Keiichi N. Ishihara
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Charge Separation ◽  
Solvothermal Synthesis ◽  
Photocatalytic Performance ◽  
Binding Energies ◽  
X Ray ◽  
Spatial Charge ◽  
Photodegradation Rate

Heterojunction photocatalysts have attracted a significant amount of attention due to their advantages over a single photocatalyst and, particularly, their superior spatial charge separation. Herein, the BiVO4/Bi2S3/SnS2 heterojunction was synthesized via solvothermal synthesis with different ratios of BiVO4 to SnS2. The photodegradation rate of the 0.03 BiVO4/SnS2 sample for rhodamine B removal is 2.3 times or 2.9 times greater than that of a single SnS2 or BiVO4, respectively. The chemical bond between photocatalysts is confirmed by X-ray photoelectron spectroscopy (XPS), and the synchronized shift observed in binding energies strongly indicates the electron screening effect at the heterojunction. A Z-scheme model is proposed to explain charge transfer pathway in the system, in which the formation of Bi2S3 plays a crucial role in the enhanced photocatalytic performance of the heterojunction.

Atomistic effect of laterally and vertically growth shell on physical behaviours of CdSe/CdTe type-II core/crown and core/shell nanoplatelets: tight-binding theory

2021 ◽  
Vol 96 (12) ◽  
pp. 125867
Author(s):  
Worasak Sukkabot
Keyword(s):  
Charge Separation ◽  
Tight Binding ◽  
Band Gaps ◽  
Core Shell ◽  
Type Ii ◽  
Binding Theory ◽  
Theoretical Understanding ◽  
Spatial Charge ◽  
The Impact ◽  
Cdte Core

Abstract Utilizing the atomistic tight-binding theory, the impact of the lateral and vertical potential confinement by the coated shell on the CdSe/CdTe core/crown and core/shell nanoplatelets (NPLs) is attained. The spatial charge separation and encapsulated shell have a noteworthy impact on the electronic structures and optical properties because of the type-II band profile. The reduced band gaps with the growing laterally and vertically passivated shell thicknesses are due to the quantum confinement phenomena. The optical band gaps adjusted across the visible light are achieved by the shell thickness change. The excitonic binding energies of CdSe/CdTe core/shell NPLs are larger than those of CdSe/CdTe core/crown NPLs. Thanks to the spatial charge separation, a shortening of the oscillation strengths is concomitant with an increase of the radiative lifetimes. Overall, this scientific research underlines the importance of the theoretical understanding and practical control by lateral and vertical confinement of heterostructure NPLs.

Type-II/type-II band alignment to boost spatial charge separation: a case study of g-C3N4 quantum dots/a-TiO2/r-TiO2 for highly efficient photocatalytic hydrogen and oxygen evolution

Nanoscale ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 6037-6046 ◽  
Author(s):  
Bing-Xin Zhou ◽  
Shuang-Shuang Ding ◽  
Yan Wang ◽  
Xiao-Rui Wang ◽  
Wei-Qing Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Charge Separation ◽  
Band Alignment ◽  
Type Ii ◽  
Photocatalytic Water Splitting ◽  
Highly Efficient ◽  
Spatial Charge

Ti–N covalently bridged 0D/0D QCN/a-TiO2/r-TiO2 T-II/T-II heterojunctions for enhanced photocatalytic water splitting.

Interfacial Charge Modulation: An Efficient Strategy for Boosting Spatial Charge Separation on Semiconductor Photocatalysts

2019 ◽  
Vol 9 (13) ◽  
pp. 1803951 ◽  
Author(s):  
Xiaoping Tao ◽  
Yuying Gao ◽  
Shengyang Wang ◽  
Xiaoyu Wang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Charge Separation ◽  
Efficient Strategy ◽  
Spatial Charge ◽  
Charge Modulation ◽  
Interfacial Charge

Efficient spatial charge separation in unique 2D tandem heterojunction CdxZn1−xIn2S4–CdS–MoS2 rendering highly-promoted visible-light-induced H2 generation

2021 ◽  
Vol 9 (1) ◽  
pp. 482-491
Author(s):  
Jiakun Wu ◽  
Bowen Sun ◽  
Hui Wang ◽  
Yanyan Li ◽  
Ying Zuo ◽  
...  
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
Effective Charge ◽  
Active Sites ◽  
H2 Generation ◽  
Highly Efficient ◽  
Spatial Charge

Unique 2D heterostructures CdxZn1−xIn2S4–CdS–MoS2 with effective charge separation, excellent light-harvest, and abundant active sites are highly-efficient for photocatalytic H2 evolution.

A Novel Heterogeneous Catalyst NH2-MIL-88/PMo10V2 for Photocatalytic Activity Enhancement of Benzene Hydroxylation

2021 ◽  
Author(s):  
PanPan Xu ◽  
Liuxue Zhang ◽  
Xu Jia ◽  
Hao Wen ◽  
Xiulian Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Aromatic Hydrocarbon ◽  
Production Process ◽  
Heterogeneous Catalyst ◽  
Direct Oxidation ◽  
Benzene Hydroxylation ◽  
Activity Enhancement

Comparing to current commercial three-step production process involving low phenol yield, low atomic efficiency, and the formation of explosive intermediates. The direct oxidation of aromatic hydrocarbon to more desirable and...

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