Construction of g-C3N4/S-g-C3N4 metal-free isotype heterojunctions with an enhanced charge driving force and their photocatalytic performance under anoxic conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90750-90756 ◽  
Author(s):  
Shaozheng Hu ◽  
Lin Ma ◽  
Fayun Li ◽  
Zhiping Fan ◽  
Qiong Wang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Driving Force ◽  
Photocatalytic Performance ◽  
Anoxic Conditions ◽  
Metal Free ◽  
Efficient Charge ◽  
Calcination Method

g-C3N4/S-g-C3N4 metal-free isotype heterojunction catalysts with an enhanced charge driving force were prepared by a two step calcination method. The results indicate that this method can lead to a more efficient charge-carrier migration.

scholarly journals Efficient Charge Carrier Separation in l-Alanine Acids Derived N-TiO2 Nanospheres: The Role of Oxygen Vacancies in Tetrahedral Ti4+ Sites

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 698 ◽  
Author(s):  
Yongjuan Chen ◽  
Xiu Luo ◽  
Yao Luo ◽  
Peiwen Xu ◽  
Jiao He ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Charge Carrier ◽  
Visible Light ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Charge Carriers ◽  
Tio2 Sample ◽  
Doped Tio2 ◽  
Efficient Charge

N-doped TiO2 with oxygen vacancies exhibits many advantages for photocatalysis, such as enhanced visible light absorbency, inhibition of the photogenerated charge carrier recombination, etc. However, preparation of N-doped TiO2 with oxygen vacancies under mild conditions is still a challenge. Herein, N-doped TiO2 nanospheres with tetrahedral Ti4+ sites were synthesized by using dodecylamine as template and assisted by l-alanine acids. The obtained samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–Vis diffuse reflectance spectra (UV–Vis DRS). It was found that the dodecylamine as a neutral surfactant controlled the structure of TiO2 spherical, while l-alanine acids provided a nitrogen source. The existence of tetrahedral Ti4+ sites in N-doped TiO2 was also confirmed. The N-doped TiO2 sample with tetrahedral Ti4+ sites exhibited significantly improved photocatalytic performance for degradation of methylene blue solution under UV light or visible light irradiation. A combined time-resolved infrared (IR) spectroscopy study reveals that the enhanced photocatalytic performance could be attributed to a large amount of photogenerated charge carriers and efficient charge separation. It is demonstrated that the shallow donor state produced by oxygen vacancies of tetrahedral Ti4+ sites can effectively promote separation of charge carriers besides capturing electrons.

Conditions for efficient charge generation preceded by energy transfer process in non-fullerene organic solar cells

2021 ◽  
Author(s):  
L. Benatto ◽  
C. A. M. Moraes ◽  
G. Candiotto ◽  
K. R. A. Sousa ◽  
J. P. A. Souza ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solar Cells ◽  
Binding Energy ◽  
Transfer Process ◽  
Organic Solar Cells ◽  
Driving Force ◽  
Energy Transfer Process ◽  
Simple Relationship ◽  
Charge Generation ◽  
Efficient Charge

Our results provide a simple relationship involving the driving force and binding energy of CT state to maximize charge generation in non-fullerene organic solar cells.

Bi-doped Graphitic Carbon Nitride Nanotubes Boosts the Degradation Photocatalysis of Rhodamine B

2022 ◽  
Author(s):  
Qingqing Gao ◽  
Qian Lei ◽  
Ruoyan Miao ◽  
Manyi Gao ◽  
Fang Song ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Rhodamine B ◽  
High Stability ◽  
Carbon Nitride ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Efficiency ◽  
Metal Free ◽  
Carrier Recombination ◽  
Charge Carrier Recombination ◽  
Polymeric Carbon

Polymeric carbon nitride (PCN) is an emerging metal-free photocatalysts with high stability but is plagued by low photocatalytic efficiency due to the rapid charge carrier recombination behavior. Herein, Bi doped...

Highly efficient charge transfer through a double Z-scheme mechanism by a Cu-promoted MoO3/g-C3N4 hybrid nanocomposite with superior electrochemical and photocatalytic performance

Nanoscale ◽  
2018 ◽  
Vol 10 (13) ◽  
pp. 5950-5964 ◽  
Author(s):  
Sulagna Patnaik ◽  
Gayatri Swain ◽  
K. M. Parida
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Transfer Mechanism ◽  
Hybrid Nanocomposite ◽  
Charge Transfer Mechanism ◽  
Highly Efficient ◽  
Efficient Charge

A visible light-induced double Z-scheme charge transfer mechanism for H2 generation and Cr(vi) reduction over the Cu-MoO3/g-C3N4 composite.

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