Temperature-controlled evolution of microstructures that promote charge separation in a TaON photoanode for enhanced solar energy conversion

2017 ◽  
Vol 5 (25) ◽  
pp. 12848-12855 ◽  
Author(s):  
Lang Pei ◽  
Zhe Xu ◽  
Shicheng Yan ◽  
Zhigang Zou
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Charge Separation ◽  
Heating Temperature ◽  
Solar Energy Conversion ◽  
Bulk Charge ◽  
Temperature Controlled ◽  
Water Saturated

The microstructure of TaON can be easily tuned by changing the heating temperature via a water-saturated ammonia nitriding route, thus affecting the bulk charge separation and transfer of the material.

Spatial distribution of active sites on a ferroelectric PbTiO3 photocatalyst for photocatalytic hydrogen production

2017 ◽  
Vol 198 ◽  
pp. 463-472 ◽  
Author(s):  
Rengui Li ◽  
Yue Zhao ◽  
Can Li
Keyword(s):  
Spatial Distribution ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Energy Conversion ◽  
Electric Fields ◽  
Charge Separation ◽  
Active Sites ◽  
Solar Energy Conversion ◽  
Photogenerated Electrons ◽  
The Right

The separation of photogenerated charge carries is a challenging issue in artificial photocatalyst systems for solar energy conversion. It has been reported that spatial charge separation can take place between different facets of semiconductor-based crystals with regular morphology and facets, which could be used to rationally deposit cocatalysts on the right facets. However, the spatial separation of photogenerated electrons and holes is still a big challenge for a particulate photocatalyst without regular morphology and specific facets. In this work, we demonstrated that photogenerated electrons and holes can be regularly separated on ferroelectric PbTiO3 photocatalyst even without regular morphology and facets. The reduction cocatalyst and oxidation cocatalyst could be selectively formed on different sites via an in situ photochemical deposition method. It is found that the photoactivity and hydrogen production for PbTiO3 with spatially separated dual-cocatalysts is remarkably enhanced to more than 100 times greater compared to native PbTiO3, which is much higher than that the case of dual-cocatalysts with a random distribution. The intrinsic electric fields and spontaneous electric polarization in the bulk of PbTiO3 are proposed to play important roles in the spatial distribution of active sites on irregular PbTiO3 particles. Our work emphasizes the essential roles of two important factors, efficient charge separation strategy and the location of dual-cocatalysts on the right sites, to construct integrated artificial photocatalyst systems for solar energy conversion.

Double heterojunction nanowire photocatalysts for hydrogen generation

Nanoscale ◽  
2014 ◽  
Vol 6 (8) ◽  
pp. 4117-4124 ◽  
Author(s):  
P. Tongying ◽  
F. Vietmeyer ◽  
D. Aleksiuk ◽  
G. J. Ferraudi ◽  
G. Krylova ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Solar Energy ◽  
Energy Conversion ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Solar Energy Conversion ◽  
Double Heterojunction ◽  
Key Aspects

Charge separation and charge transfer across interfaces are key aspects in the design of efficient photocatalysts for solar energy conversion.

Facet-selective charge separation in layered bismuth-based photocatalysts

2021 ◽  
Author(s):  
Cheng Hu ◽  
Na Tian ◽  
Yihe Zhang ◽  
Hongwei Huang
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Charge Separation ◽  
Photocatalytic Performance ◽  
Solar Energy Conversion ◽  
Spatial Charge

Facet-selective charge separation in semiconductors has been considered one of the most vital factors to improve their photocatalytic performance and selectivity for solar energy conversion due to the spatial charge...

Controllable nanothorns on TiO2mesocrystals for efficient charge separation in hydrogen evolution

2017 ◽  
Vol 53 (38) ◽  
pp. 5306-5309 ◽  
Author(s):  
Peng Zhang ◽  
Sooyeon Kim ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Hydrogen Evolution ◽  
Charge Separation ◽  
Electron Flow ◽  
Solar Energy Conversion ◽  
Efficient Charge ◽  
Induced Charge ◽  
Topotactic Transformation

Herein, we investigated that sheet-like TiO2mesocrystals with controllable nanothorns on the {101} facet during the topotactic transformation exhibit facet-induced charge separation and anisotropic electron flow, realizing the superior facet-dependent photocatalysis in solar energy conversion.

Rational Design of Interface Refining through Ti4+/Zr4+ diffusion/doping and TiO2/ZrO2 Surface Crowning of ZnFe2O4 Nanocorals for Photoelectrochemical Water Splitting

2021 ◽  
Author(s):  
Sarang Kim ◽  
Mahadeo A. Mahadik ◽  
Anushkkaran Periyasamy ◽  
Weon-Sik Chae ◽  
Jungho Ryu ◽  
...  
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Water Splitting ◽  
Charge Separation ◽  
Rational Design ◽  
Solar Energy Conversion ◽  
Photoelectrochemical Water Splitting ◽  
Effective Technique

The development of advanced assemblies of interfacial under- and overlayered photoanodes is an effective technique to overcome the problem of slow charge separation and enhance solar‐energy conversion. Present study reports...

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