Hollow TiO2@CdS nanosphere: Interface construction for spatial charge separation and higher charge transfer efficiency

2021 ◽  
pp. 106211
Author(s):  
Na Guo ◽  
Chuantao Wang ◽  
Weiwei Bao ◽  
Ying Zeng ◽  
Hongwen Yu
Keyword(s):  
Charge Transfer ◽  
Charge Separation ◽  
Transfer Efficiency ◽  
Spatial Charge

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.

Core–shell carbon colloid sphere@phosphotungstic acid/CdS as a Z-scheme heterojunction with synergistic adsorption, photothermal and photocatalytic performance

2021 ◽  
Vol 11 (18) ◽  
pp. 6080-6088
Author(s):  
Yongqian Cui ◽  
Zipeng Xing ◽  
Meijun Guo ◽  
Yalu Qiu ◽  
Bin Fang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Charge Separation ◽  
Photocatalytic Performance ◽  
Phosphotungstic Acid ◽  
Photothermal Effect ◽  
Core Shell ◽  
Spatial Charge ◽  
Visible Light Driven

Core–shell carbon colloid sphere@phosphotungstic acid/CdS exhibits excellent visible-light-driven photocatalytic performance, which is due to the Z-scheme heterojunction favoring the charge transfer and spatial charge separation and the photothermal effect.

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.

scholarly journals Anion-enhanced excited state charge separation in a spiro-locked N-heterocycle-fused push-pull zinc porphyrin

2021 ◽  
Author(s):  
Mandeep K. Chahal ◽  
Anuradha Liyanage ◽  
Ajyal Z. Alsaleh ◽  
Paul A. Karr ◽  
Jonathan P. Hill ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Charge Separation ◽  
Charge Transfer Complex ◽  
Zinc Porphyrin ◽  
New Type ◽  
State Charge

A new type of push–pull charge transfer complex, viz., a spiro-locked N-heterocycle-fused zinc porphyrin, ZnP-SQ, is shown to undergo excited state charge separation, which is enhanced by axial F− binding to the Zn center.

scholarly journals Long-lived charge separation following pump-wavelength–dependent ultrafast charge transfer in graphene/WS2 heterostructures

2021 ◽  
Vol 7 (9) ◽  
pp. eabd9061
Author(s):  
Shuai Fu ◽  
Indy du Fossé ◽  
Xiaoyu Jia ◽  
Jingyin Xu ◽  
Xiaoqing Yu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Separation ◽  
Transient Absorption ◽  
Transition Metal Dichalcogenides ◽  
Thermionic Emission ◽  
Great Promise ◽  
Metal Dichalcogenides ◽  
Ultrafast Charge Transfer ◽  
Device Operation ◽  
Interfacial Charge

Van der Waals heterostructures consisting of graphene and transition metal dichalcogenides have shown great promise for optoelectronic applications. However, an in-depth understanding of the critical processes for device operation, namely, interfacial charge transfer (CT) and recombination, has so far remained elusive. Here, we investigate these processes in graphene-WS2 heterostructures by complementarily probing the ultrafast terahertz photoconductivity in graphene and the transient absorption dynamics in WS2 following photoexcitation. We observe that separated charges in the heterostructure following CT live extremely long: beyond 1 ns, in contrast to ~1 ps charge separation reported in previous studies. This leads to efficient photogating of graphene. Furthermore, for the CT process across graphene-WS2 interfaces, we find that it occurs via photo-thermionic emission for sub-A-exciton excitations and direct hole transfer from WS2 to the valence band of graphene for above-A-exciton excitations. These findings provide insights to further optimize the performance of optoelectronic devices, in particular photodetection.

Charge transfer efficiency in proton damaged CCD's

1998 ◽  
Vol 45 (2) ◽  
pp. 154-163 ◽  
Author(s):  
T. Hardy ◽  
R. Murowinski ◽  
M.J. Deen
Keyword(s):  
Charge Transfer ◽  
Transfer Efficiency
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