Enhanced Charge Separation Efficiency Accelerates Hydrogen Evolution from Water of Carbon Nitride and 3,4,9,10-Perylene-tetracarboxylic Dianhydride Composite Photocatalyst

2018 ◽  
Vol 10 (4) ◽  
pp. 3515-3521 ◽  
Author(s):  
Chen Ye ◽  
Jia-Xin Li ◽  
Hao-Lin Wu ◽  
Xu-Bing Li ◽  
Bin Chen ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Charge Separation ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Composite Photocatalyst ◽  
Charge Separation Efficiency ◽  
Tetracarboxylic Dianhydride

scholarly journals Bottom-Up Enhancement of g-C3N4Photocatalytic H2Evolution Utilising Disordering Intermolecular Interactions of Precursor

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Xue Lu Wang ◽  
Wen Qi Fang ◽  
Yu Hang Li ◽  
Pengfei Liu ◽  
Haimin Zhang ◽  
...  
Keyword(s):  
Charge Separation ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Weak Interactions ◽  
Bottom Up ◽  
Optical Window ◽  
Design And Optimization ◽  
Final Sample ◽  
Potential Applications ◽  
Charge Separation Efficiency

Disordered intermolecular interaction carbon nitride precursor prepared by water-assisted grinding of dicyandiamide was used for synthesis of g-C3N4. The final sample possesses much looser structure and provides a broadening optical window for effective light harvesting and charge separation efficiency, which exhibits significantly improved H2evolution by photocatalytic water splitting. The bottom-up mechanochemistry method opens new vistas towards the potential applications of weak interactions in the photocatalysis field and may also stimulate novel ideas completely different from traditional ones for the design and optimization of photocatalysts.

Photodecomposition of H2S to H2 over Cu2+ Doped Cd0.3In2S4-Zn0.7In2S4 Composite Photocatalysts

2012 ◽  
Vol 486 ◽  
pp. 174-180
Author(s):  
Xue Feng Bai ◽  
Wen Yan Shan
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Photophysical Properties ◽  
H2 Evolution ◽  
Composite Photocatalyst ◽  
Long Wavelength ◽  
Composite Photocatalysts ◽  
Charge Separation Efficiency

The Cd0.3In2S4-Zn0.7In2S4 composite photocatalyst doped with transition metal Cu2+ has been synthesized by hydrothermal method. The physical and photophysical properties of the above-prepared photocatalysts were characterized by XRD, UV-Vis, SPS, SEM and XPS. The XRD peaks of Cu2+ doped Cd0.3In2S4-Zn0.7In2S4 were almost the same as the crystal structure of Cd0.3In2S4-Zn0.7In2S4. The UV-Vis absorption edge of Cu2+ doped Cd0.3In2S4-Zn0.7In2S4 shifted monotonically to long wavelength. The photocatalytic activity of Cu2+ doped photocatalysts had been improved as a result of the enhancement of the charge separation efficiency. The results indicated that the photocatalyst of Cu2+(2wt %)-Cd0.3In2S4/Zn0.7In2S4 exhibited the highest photocatalytic activity with the rate of H2 evolution to be 1141 μmol/(h·g) under visible light irradiation.

A green and facile method to prepare graphitic carbon nitride nanosheets with outstanding photocatalytic H2O2 production ability via NaClO hydrothermal treatment

2018 ◽  
Vol 42 (22) ◽  
pp. 18335-18341 ◽  
Author(s):  
Hui Wang ◽  
Lei Fang ◽  
Shaozheng Hu ◽  
Yanbo Pei ◽  
Wentao Ma
Keyword(s):  
Surface Area ◽  
Charge Separation ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
H2o2 Production ◽  
Photocatalytic Process ◽  
Charge Separation Efficiency ◽  
Carbon Nitride Nanosheets

Transportation and transformation of photogenerated carriers during the photocatalytic process of graphitic carbon nitride (g-C3N4) are restricted by the low surface area and insufficient charge separation efficiency.

Combination of efficient charge separation with the assistance of novel dual Z-scheme system: self-assembly photocatalyst Ag@AgI/BiOI modified oxygen-doped carbon nitride nanosheet with enhanced photocatalytic performance

2018 ◽  
Vol 8 (4) ◽  
pp. 1161-1175 ◽  
Author(s):  
Chao Liang ◽  
Cheng-Gang Niu ◽  
Hai Guo ◽  
Da-Wei Huang ◽  
Xiao-Ju Wen ◽  
...  
Keyword(s):  
Self Assembly ◽  
Charge Separation ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
The Self ◽  
High Charge ◽  
Efficient Charge ◽  
Charge Separation Efficiency

The self-assembly dual Z-scheme photocatalyst Ag@AgI/BiOI/g-C3N4 was successfully fabricated with high charge separation efficiency.

scholarly journals MXene-Ti3C2 assisted one-step synthesis of carbon-supported TiO2/Bi4NbO8Cl heterostructures for enhanced photocatalytic water decontamination

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 2077-2088 ◽  
Author(s):  
Daixun Jiang ◽  
Xun Sun ◽  
Xilu Wu ◽  
Shuai Zhang ◽  
Xiaofei Qu ◽  
...  
Keyword(s):  
Charge Separation ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Salt Flux ◽  
The Novel ◽  
Water Contaminants ◽  
Photocatalytic Removal ◽  
One Step ◽  
Charge Separation Efficiency ◽  
Perovskite Type

AbstractThe strategy to improve the photocatalytic removal efficiencies towards organic pollutants is still a challenge for the novel Sillen–Aurivillius perovskite type Bi4NbO8Cl. Herein, we report carbon-supported TiO2/Bi4NbO8Cl (C-TiO2/Bi4NbO8Cl) heterostructures with enhanced charge separation efficiency, which were fabricated via molten-salt flux process. The carbon-supported TiO2 particles were derived from MXene Ti3C2 precursors, and attached on plate-like Bi4NbO8Cl, acting as electron-traps to achieve supressed recombination of photo-induced charges. The improved charge separation confers C-TiO2/Bi4NbO8Cl heterostructures superior photocatalytic performance with 53% higher than pristine Bi4NbO8Cl, towards rhodamine B removal with the help of photo-induced holes. Moreover, the C-TiO2/Bi4NbO8Cl heterostructures can be expanded to deal with other water contaminants, such as methyl orange, ciprofloxacin and 2,4-dichlorophenol with 44, 25 and 13% promotion, respectively, and thus the study offers a series of efficient photocatalysts for water purification.

scholarly journals Band Engineering and Morphology Control of Oxygen-Incorporated Graphitic Carbon Nitride Porous Nanosheets for Highly Efficient Photocatalytic Hydrogen Evolution

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yunyan Wu ◽  
Pan Xiong ◽  
Jianchun Wu ◽  
Zengliang Huang ◽  
Jingwen Sun ◽  
...  
Keyword(s):  
Surface Area ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Physical Adsorption ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Hydrogen Evolution ◽  
Band Engineering ◽  
Highly Efficient

AbstractGraphitic carbon nitride (g-C3N4)-based photocatalysts have shown great potential in the splitting of water. However, the intrinsic drawbacks of g-C3N4, such as low surface area, poor diffusion, and charge separation efficiency, remain as the bottleneck to achieve highly efficient hydrogen evolution. Here, a hollow oxygen-incorporated g-C3N4 nanosheet (OCN) with an improved surface area of 148.5 m2 g−1 is fabricated by the multiple thermal treatments under the N2/O2 atmosphere, wherein the C–O bonds are formed through two ways of physical adsorption and doping. The physical characterization and theoretical calculation indicate that the O-adsorption can promote the generation of defects, leading to the formation of hollow morphology, while the O-doping results in reduced band gap of g-C3N4. The optimized OCN shows an excellent photocatalytic hydrogen evolution activity of 3519.6 μmol g−1 h−1 for ~ 20 h, which is over four times higher than that of g-C3N4 (850.1 μmol g−1 h−1) and outperforms most of the reported g-C3N4 catalysts.

scholarly journals Self-template synthesis of ATiO3 (A = Ba, Pb and Sr) perovskites for photocatalytic removal of NO

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27397-27404 ◽  
Author(s):  
Shiyi Cai ◽  
Shan Yu ◽  
Wenchao Wan ◽  
Wen Wen ◽  
Ying Zhou
Keyword(s):  
Template Synthesis ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Light Response ◽  
Photocatalytic Removal ◽  
Charge Separation Efficiency

ATiO3 were synthesized from TiO2 nanosheets dominated with {001} facets, PbTiO3 possesses the highest activity as a result of larger light response and higher charge separation efficiency.

scholarly journals Impact of Nanoparticle Consolidation on Charge Separation Efficiency in Anatase TiO2 Films

2021 ◽  
Vol 9 ◽  
Author(s):  
Karin Rettenmaier ◽  
Thomas Berger
Keyword(s):  
Thermal Annealing ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Internal Surface ◽  
Processing Temperature ◽  
Cyclic Voltammograms ◽  
Internal Surface Area ◽  
Deep Traps ◽  
Charge Separation Efficiency ◽  
The Impact

Mesoporous films and electrodes were prepared from aqueous slurries of isolated anatase TiO2 nanoparticles. The resulting layers were annealed in air at temperatures 100°C ≤ T ≤ 450°C upon preservation of internal surface area, crystallite size and particle size. The impact of processing temperature on charge separation efficiency in nanoparticle electrodes was tracked via photocurrent measurements in the presence of methanol as a hole acceptor. Thermal annealing leads to an increase of the saturated photocurrent and thus of the charge separation efficiency at positive potentials. Furthermore, a shift of capacitive peaks in the cyclic voltammograms of the nanoparticle electrodes points to the modification of the energy of deep traps. Population of these traps triggers recombination possibly due to the action of local electrostatic fields attracting photogenerated holes. Consequently, photocurrents saturate at potentials, at which deep traps are mostly depopulated. Charge separation efficiency was furthermore investigated for nanoparticle films and was tracked via the decomposition of hydrogen peroxide. Our observations evidence an increase of charge separation efficiency upon thermal annealing. The effect of particle consolidation, which we associate with minute atomic rearrangements at particle/particle contacts, is attributed to the energetic modification of deep traps and corresponding modifications of charge transport and recombination, respectively.

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