Enhanced N-doping efficiency and photocatalytic H2 evolution rate of InNbO4 by mechanochemical activation

2010 ◽  
Vol 25 (1) ◽  
pp. 159-166 ◽  
Author(s):  
Jun Lv ◽  
Tetsuya Kako ◽  
Zhigang Zou ◽  
Jinhua Ye
Keyword(s):  
Photocatalytic Activity ◽  
Optical Property ◽  
Crystallite Size ◽  
Surface Area ◽  
Phase Formation ◽  
Mechanochemical Activation ◽  
Evolution Rate ◽  
H2 Evolution ◽  
N Doping ◽  
Photocatalytic H2 Evolution

In this work, mechanochemical activation was found to be an effective method to improve nitrogen (N)-doping efficiency and the photocatalytic H2 evolution rate of InNbO4. The effects of mechanochemical treating time on phase formation, surface area, crystallite size, optical property, N-doping efficiency, and photocatalytic activity of InNbO4 were investigated experimentally. The results indicated the decreasing of crystallite size was an important factor for the improvement of N-doping efficiency and photocatalytic activity.

Bi2WO6 Nanoparticles Prepared by Combustion Synthesis with Different Fuels and their Photocatalytic Activity

2014 ◽  
Vol 604 ◽  
pp. 93-101
Author(s):  
Maris Kodols ◽  
Sabine Didrihsone ◽  
Janis Grabis
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Citric Acid ◽  
Ethylene Glycol ◽  
Specific Surface ◽  
Crystallite Size ◽  
Combustion Synthesis ◽  
Surface Area ◽  
Specific Surface Area ◽  
Solution Ph

The influence of glycine, glycerine, ethylene glycol and citric acid fuel and their ratio to NO3- on formation and dispersity of Bi2WO6 nanoparticles prepared by combustion synthesis has been studied. The pure crystalline Bi2WO6 with specific surface area 24,8 m2/g and crystallite size of 28 nm was obtained by using glycerine as fuel at its ratio to NO3- of 0,67. The photocatalytic activity of the prepared Bi2WO6 in degradation of methylene blue depended on its specific surface area of samples and solution pH.

scholarly journals Photocatalytic H2 Evolution on TiO2 Assembled with Ti3C2 MXene and Metallic 1T-WS2 as Co-catalysts

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Yujie Li ◽  
Lei Ding ◽  
Shujun Yin ◽  
Zhangqian Liang ◽  
Yanjun Xue ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Surface Area ◽  
Active Site ◽  
Tungsten Disulfide ◽  
Transfer Efficiency ◽  
H2 Evolution ◽  
Co Catalysts ◽  
Efficient Separation ◽  
Photocatalytic H2 Evolution

AbstractThe biggest challenging issue in photocatalysis is efficient separation of the photoinduced carriers and the aggregation of photoexcited electrons on photocatalyst’s surface. In this paper, we report that double metallic co-catalysts Ti3C2 MXene and metallic octahedral (1T) phase tungsten disulfide (WS2) act pathways transferring photoexcited electrons in assisting the photocatalytic H2 evolution. TiO2 nanosheets were in situ grown on highly conductive Ti3C2 MXenes and 1T-WS2 nanoparticles were then uniformly distributed on TiO2@Ti3C2 composite. Thus, a distinctive 1T-WS2@TiO2@Ti3C2 composite with double metallic co-catalysts was achieved, and the content of 1T phase reaches 73%. The photocatalytic H2 evolution performance of 1T-WS2@TiO2@Ti3C2 composite with an optimized 15 wt% WS2 ratio is nearly 50 times higher than that of TiO2 nanosheets because of conductive Ti3C2 MXene and 1T-WS2 resulting in the increase of electron transfer efficiency. Besides, the 1T-WS2 on the surface of TiO2@Ti3C2 composite enhances the Brunauer–Emmett–Teller surface area and boosts the density of active site.

Insight into the factors influencing the photocatalytic H2 evolution performance of molybdenum sulfide

2019 ◽  
Vol 43 (3) ◽  
pp. 1230-1237 ◽  
Author(s):  
Mingcai Yin ◽  
Wenli Zhang ◽  
Hui Li ◽  
Chaojun Wu ◽  
Fangfang Jia ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Photocatalytic Performance ◽  
Molybdenum Sulfide ◽  
H2 Evolution ◽  
Key Factors ◽  
Factors Influencing ◽  
Insight Into ◽  
Photocatalytic H2 Evolution

The specific surface area and composition are found to be the key factors influencing the photocatalytic performance of MoS2+x.

A novel heterogeneous hybrid by incorporation of Nb2O5 microspheres and reduced graphene oxide for photocatalytic H2 evolution under visible light irradiation

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 47117-47124 ◽  
Author(s):  
Zongkuan Yue ◽  
Dongmei Chu ◽  
Hui Huang ◽  
Jie Huang ◽  
Ping Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
H2 Evolution ◽  
Reduced Graphene ◽  
Photocatalytic H2 Evolution

A novel heterogeneous hybrid composed of Nb2O5 microspheres and reduced graphene oxide as photocatalyst exhibits superior photocatalytic activity and stability.

TiO2 mesocrystals built of nanocrystals with exposed {001} facets: facile synthesis and superior photocatalytic ability

2014 ◽  
Vol 2 (46) ◽  
pp. 19589-19593 ◽  
Author(s):  
Yanna Guo ◽  
Hui Li ◽  
Jin Chen ◽  
Xuejing Wu ◽  
Lei Zhou
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Crystallite Size ◽  
Surface Area ◽  
Crystallographic Orientation ◽  
Low Cost ◽  
Facile Synthesis ◽  
Photocatalytic Ability ◽  
Similar Crystallographic Orientation ◽  
The Relationship

A totally novel, extremely easy, much greener and low-cost method has been developed to synthesize TiO2 mesocrystals. These materials are built of TiO2 nanocrystals with similar crystallographic orientation and largely exposed {001} facets. Their unique structure optimizes the relationship between specific surface area, crystallite size and active facets, and therefore leads to superior photocatalytic activity.

Synthesis and photocatalytic H2 evolution properties of four titanium-oxo-clusters based on a cyclohex-3-ene-1-carboxylate ligand

2017 ◽  
Vol 46 (32) ◽  
pp. 10630-10634 ◽  
Author(s):  
Mei-Yan Gao ◽  
Shumei Chen ◽  
Lan-Xia Hu ◽  
Lei Zhang ◽  
Jian Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Carboxylate Ligand ◽  
H2 Evolution ◽  
Photocatalytic H2 Evolution

This work reveals an interesting Ti–Cec system with various structures, where PTC-91 and PTC-94 have good photocatalytic activity and stability in water-splitting hydrogen evolution.

Engineering a highly dispersed co-catalyst on a few-layered catalyst for efficient photocatalytic H2 evolution: a case study of Ni(OH)2/HNb3O8 nanocomposites

2017 ◽  
Vol 7 (23) ◽  
pp. 5662-5669 ◽  
Author(s):  
Yuzhou Xia ◽  
Weihang Chen ◽  
Shijing Liang ◽  
Jinhong Bi ◽  
Ling Wu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
H2 Evolution ◽  
Co Catalyst ◽  
Highly Dispersed ◽  
Photocatalytic H2 Evolution ◽  
Layered Catalyst

Ni(OH)2 has been highly dispersed on HNb3O8 nanosheets and the composites exhibited greatly enhanced photocatalytic activity.

scholarly journals Effects of RhCrOx Cocatalyst Loaded on Different Metal Doped LaFeO3 Perovskites with Photocatalytic Hydrogen Performance under Visible Light Irradiation

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 612
Author(s):  
Tzu Hsuan Chiang ◽  
Gujjula Viswanath ◽  
Yu-Si Chen
Keyword(s):  
Electron Microscope ◽  
Water Splitting ◽  
Fossil Fuels ◽  
H2 Production ◽  
Photoelectron Spectra ◽  
Evolution Rate ◽  
Impregnation Method ◽  
H2 Evolution ◽  
X Ray ◽  
Photocatalytic H2 Evolution

Photocatalytic hydrogen (H2) production by water splitting provides an alternative to fossil fuels using clean and renewable energy, which gives important requirements about the efficiency of photocatalysts, co-catalysts, and sacrificial agents. To achieve higher H2 production efficiencies from water splitting, the study uses different metals such as yttrium (Y), praseodymium (Pr), magnesium (Mg), Indium (In), calcium (Ca), europium (Eu), and terbium (Tb) doped lanthanum iron oxide (LaFeO3) perovskites. They were synthesized using a co-precipitate method in a citric acid solution, which was loaded with the rhodium chromium oxide (RhCrOx) cocatalysts by an impregnation method along with a detailed investigation of photocatalytic hydrogen evolution performance. Photoluminescence (PL) and UV–Vis diffuse reflectance spectra (DRS) measured the rate of electron–hole recombination for RhCrOx/Pr-LaFeO3 photocatalysts, and X-ray powder diffraction (XRD), scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), and X-ray photoelectron spectra (XPS) analyzed their characteristics. The experimental results obtained show that the samples with 0.5 wt.% RhCrOx loading and 0.1 M Pr-doped LaFeO3 calcined at a temperature of 700 °C (0.1Pr-LaFeO3-700) exhibited the highest photocatalytic H2 evolution rate of 127 µmol h−1 g−1, which is 34% higher photocatalytic H2 evolution performance than undoped LaFeO3 photocatalysts (94.8 μmol h−1 g−1). A measure of 20% of triethanolamine (TEOA) enabled a high hole capture capability and promoted 0.1-Pr-LaFeO3-700 to get the highest H2 evolution rate.

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