A Janus MoSSe monolayer: a potential wide solar-spectrum water-splitting photocatalyst with a low carrier recombination rate

2018 ◽  
Vol 6 (5) ◽  
pp. 2295-2301 ◽  
Author(s):  
Xiangchao Ma ◽  
Xin Wu ◽  
Haoda Wang ◽  
Yucheng Wang
Keyword(s):  
Water Splitting ◽  
Recombination Rate ◽  
Solar Spectrum ◽  
Carrier Recombination

A Janus MoSSe monolayer is theoretically predicted to be a wide solar-spectrum water-splitting photocatalyst with a low carrier recombination rate.

Few-Layered MoS2 Nanoparticles Loaded TiO2 Nanosheets with Exposed {001} Facets for Enhanced Photocatalytic Activity

NANO ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. 1850129 ◽  
Author(s):  
Chujun Chen ◽  
Xia Xin ◽  
Jinniu Zhang ◽  
Gang Li ◽  
Yafeng Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Carrier ◽  
Visible Light ◽  
Recombination Rate ◽  
Active Species ◽  
Molar Ratio ◽  
Carrier Recombination ◽  
Tio2 Nanosheets ◽  
Photocatalytic Activities ◽  
Charge Carrier Recombination

To improve the high charge carrier recombination rate and low visible light absorption of {001} facets exposed TiO2 [TiO2(001)] nanosheets, few-layered MoS2 nanoparticles were loaded on the surfaces of TiO2(001) nanosheets by a simple photodeposition method. The photocatalytic activities towards Rhodamine B (RhB) were investigated. The results showed that the MoS2–TiO2(001) nanocomposites exhibited much enhanced photocatalytic activities compared with the pure TiO2(001) nanosheets. At an optimal Mo/Ti molar ratio of 25%, the MoS2–TiO2(001) nanocomposites displayed the highest photocatalytic activity, which took only 30[Formula: see text]min to degrade 50[Formula: see text]mL of RhB (50[Formula: see text]mg/L). The active species in the degradation reaction were determined to be h[Formula: see text] and [Formula: see text]OH according to the free radical trapping experiments. The reduced charge carrier recombination rate, enhanced visible light utilization and increased surface areas contributed to the enhanced photocatalytic performances of the 25% MoS2–TiO2(001) nanocomposites.

β-SnS/GaSe heterostructure: a promising solar-driven photocatalyst with low carrier recombination for overall water splitting

2022 ◽  
Author(s):  
Jie Meng ◽  
Jiajun Wang ◽  
Jianing Wang ◽  
Qunxiang Li ◽  
Jinlong Yang
Keyword(s):  
Water Splitting ◽  
High Efficiency ◽  
2D Materials ◽  
Two Dimensional ◽  
Practical Application ◽  
Overall Water Splitting ◽  
Carrier Recombination ◽  
High Carrier

Various two-dimensional (2D) materials have been well investigated as promising high-efficiency photocatalysts for solar-driven water splitting, while the high carrier recombination greatly hinders their practical application. One effective route to...

scholarly journals Crystallite size dependent carrier recombination rate and thermal diffusivity in undoped and boron doped CVD diamond layers

2013 ◽  
Vol 210 (10) ◽  
pp. 2022-2027 ◽  
Author(s):  
P. Ščajev ◽  
S. Nargelas ◽  
K. Jarašiūnas ◽  
I. Kisialiou ◽  
E. Ivakin ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Crystallite Size ◽  
Recombination Rate ◽  
Cvd Diamond ◽  
Size Dependent ◽  
Carrier Recombination ◽  
Boron Doped

scholarly journals Two dimensional ZnO/AlN composites used for photocatalytic water-splitting: a hybrid density functional study

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36234-36239 ◽  
Author(s):  
Guangzhao Wang ◽  
Yumo Li ◽  
Ling Zhang ◽  
Junli Chang ◽  
Yadong Li ◽  
...  
Keyword(s):  
Electric Field ◽  
Visible Light ◽  
Water Splitting ◽  
Density Functional ◽  
Band Edge ◽  
Functional Study ◽  
Two Dimensional ◽  
Carrier Recombination ◽  
Photoexcited Carrier ◽  
Hybrid Density Functional

With adapted bandgap for absorbing visible light, suitable band edge positions, and induced electric field inhibiting photoexcited carrier recombination, 2% strained ZnO/AlN composite is a promising water-splitting photocatalyst.

scholarly journals DFT Study of Se and Te Doped SrTiO 3 for Enhanced Visible-Light Driven Phtocatalytic Hydrogen Production

2021 ◽  
Author(s):  
Hakim BENTOUR ◽  
Mourad Boujnah ◽  
Mohamed Houmad ◽  
Mourad El Yadari ◽  
Abdelilah BENYOUSSEF ◽  
...  
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Water Splitting ◽  
Density Functional ◽  
Hydrogen Generation ◽  
Visible Region ◽  
Solar Spectrum ◽  
Photogenerated Electron ◽  
Generalized Gradient ◽  
Light Activity

Abstract The pure STiO3 has been experimentally demonstrated to catalyze H2 production using water splitting, but the reaction can only be driven by Ultraviolet (UV) radiation due to the large band gap of SrTiO3. This motivated us to search efficient strategy to tune its band gap, so that it can function in the visible region of the solar spectrum. In this study, the electronic, optical and photocatalytic properties of Se-doped, and Te-doped SrTiO3 has been investigated using density functional theory (DFT) within the generalized gradient approximation (GGA). Our results reveal that the effect of doping can lead to band gap narrowing without introducing any isolated mid-gap states. This improves greatly the visible light activity of SrTiO3 and depresses the recombination of photogenerated electron-hole pairs. Furthermore, the locations of calculated band edges relative to the water reduction and oxidation levels for doped systems meet the water-splitting requirements. Consequently, our results show that the performance of SrTiO3 for hydrogen generation by photocatalytic water splitting is significantly enhanced with Se and Te doping. In particular, Te doping can enhance greatly the visible light photocatalytic activity of SrTiO3. We expect this study can provide a theoretical basis for a prospective experimental works.

scholarly journals Fabrication of ZnO/Red Phosphorus Heterostructure for Effective Photocatalytic H2 Evolution from Water Splitting

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 835 ◽  
Author(s):  
Jiaqi Chen ◽  
Shaolong Huang ◽  
Yaojia Long ◽  
Jiahao Wu ◽  
Hui Li ◽  
...  
Keyword(s):  
Water Splitting ◽  
H2 Production ◽  
Red Phosphorus ◽  
H2 Evolution ◽  
Electron Hole ◽  
Carrier Recombination ◽  
Photocatalytic Activities ◽  
Calcination Method ◽  
Green Technique ◽  
First Time

Photocatalysis is a green technique that can convert solar energy to chemical energy, especially in H2 production from water splitting. In this study, ZnO and red phosphorus (ZnO/RP) heterostructures were fabricated through a facile calcination method for the first time, which showed the considerable photocatalytic activity of H2 evolution. The photocatalytic activities of heterostructures with different ratios of RP have been investigated in detail. Compared to bare ZnO, ZnO/RP heterostructures exhibit a 20.8-fold enhancement for H2 production and furthermore overcome the photocorrosion issue of ZnO. The improved photocatalytic activities highly depend on the synergistic effect of the high migration efficiency of photo-induced electron–hole pairs with the inhibited charge carrier recombination on the surface. The presented strategy can also be applied to other semiconductors for various optoelectronics applications.

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