Shape-controllable synthesis of GdVO4 photocatalysts and their tunable properties in photocatalytic hydrogen generation

2019 ◽  
Vol 48 (5) ◽  
pp. 1662-1671 ◽  
Author(s):  
Paweł Mazierski ◽  
Jakub Sowik ◽  
Magdalena Miodyńska ◽  
Grzegorz Trykowski ◽  
Alicja Mikołajczyk ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Solar Energy ◽  
Visible Light ◽  
Water Splitting ◽  
Bond Energy ◽  
Hydrogen Generation ◽  
Controllable Synthesis ◽  
Hydrogen Bond Energy ◽  
Responsive Materials ◽  
Photocatalytic Hydrogen Generation

Novel visible light responsive materials for water splitting are essential for the efficient conversion of solar energy into hydrogen bond energy.

Copper-Graphene-TiO2 Hybrid Materials for Photocatalytically Assisted H2 Generation

2020 ◽  
Author(s):  
David Maria Tobaldi ◽  
Kamila Koci ◽  
Miroslava Edelmannova ◽  
Luc Lajaunie ◽  
Bruno Figueiredo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Charge Carrier ◽  
Visible Light ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Fold Increase ◽  
Photocatalytic Water Splitting ◽  
Photocatalytic Hydrogen Generation ◽  
Spatial Charge ◽  
Carrier Separation

<p>Hydrogen, as energy carrier, is a zero-emission fuel. Being green and clean, it is considered to play an important role in energy and environmental issues. Photocatalytic water splitting is a process used to generate hydrogen from the dissociation of water. Titanium dioxide is still the archetype material for photocatalytic water splitting. However, because of the fast recombination of the photo-generated exciton, the yield of the reaction is typically low. In this work, we have modified the surface of titanium dioxide with copper and copper/graphene to sensitise it to visible light, and to increase the spatial charge carrier separation, thus extending the quantum yield of H<sub>2</sub> production from methanol/water mixtures. Results showed that, in the analysed system, exists an optimum amount of copper plus graphene (<i>i.e.</i> 0.5 mol% copper plus 0.5 wt% graphene) to grant a two-fold increase in the photocatalytic hydrogen generation compared to that of bare titania. That system proved itself to be complex and dynamic. This was attributed to the increased spatial charge carrier separation exploited by graphene (under 365 and 405 nm irradiation), and to the continuous reduction of Cu(II) to Cu(I) due to IFCT that has proven to be an excellent visible-light sensitiser in the copper/graphene-titania system.</p><p>Hybrid titania-copper-graphene materials could therefore be exploited in the field of light-to-energy applications.</p>

Copper-Graphene-TiO2 Hybrid Materials for Photocatalytically Assisted H2 Generation

2020 ◽  
Author(s):  
David Maria Tobaldi ◽  
Kamila Koci ◽  
Miroslava Edelmannova ◽  
Luc Lajaunie ◽  
Bruno Figueiredo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Charge Carrier ◽  
Visible Light ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Fold Increase ◽  
Photocatalytic Water Splitting ◽  
Photocatalytic Hydrogen Generation ◽  
Spatial Charge ◽  
Carrier Separation

<p>Hydrogen, as energy carrier, is a zero-emission fuel. Being green and clean, it is considered to play an important role in energy and environmental issues. Photocatalytic water splitting is a process used to generate hydrogen from the dissociation of water. Titanium dioxide is still the archetype material for photocatalytic water splitting. However, because of the fast recombination of the photo-generated exciton, the yield of the reaction is typically low. In this work, we have modified the surface of titanium dioxide with copper and copper/graphene to sensitise it to visible light, and to increase the spatial charge carrier separation, thus extending the quantum yield of H<sub>2</sub> production from methanol/water mixtures. Results showed that, in the analysed system, exists an optimum amount of copper plus graphene (<i>i.e.</i> 0.5 mol% copper plus 0.5 wt% graphene) to grant a two-fold increase in the photocatalytic hydrogen generation compared to that of bare titania. That system proved itself to be complex and dynamic. This was attributed to the increased spatial charge carrier separation exploited by graphene (under 365 and 405 nm irradiation), and to the continuous reduction of Cu(II) to Cu(I) due to IFCT that has proven to be an excellent visible-light sensitiser in the copper/graphene-titania system.</p><p>Hybrid titania-copper-graphene materials could therefore be exploited in the field of light-to-energy applications.</p>

Ag2O modified g-C3N4 for highly efficient photocatalytic hydrogen generation under visible light irradiation

2015 ◽  
Vol 3 (30) ◽  
pp. 15710-15714 ◽  
Author(s):  
Ming Wu ◽  
Jun-Min Yan ◽  
Xue-Wei Zhang ◽  
Ming Zhao ◽  
Qing Jiang
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Hydrogen Generation ◽  
Light Irradiation ◽  
Evolution Rate ◽  
High Hydrogen ◽  
Hydrogen Evolution Rate ◽  
Photocatalytic Hydrogen Generation

Ag2O/g-C3N4 shows a high hydrogen evolution rate from water splitting. It is much more efficient than g-C3N4 and Pt/g-C3N4.

Low Temperature Synthesis Method of La2O2S2 and Evaluation of the Photocatalytic Activity

2010 ◽  
Vol 445 ◽  
pp. 217-220 ◽  
Author(s):  
Mamoru Ohashi ◽  
Tadashi Ishigaki ◽  
Kazuyoshi Uematsu ◽  
Kenji Toda ◽  
Mineo Sato
Keyword(s):  
Photocatalytic Activity ◽  
Low Temperature ◽  
Solar Energy ◽  
Visible Light ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Synthesis Method ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Energy Applications

Photocatalysts for overall water splitting have great potential in solar energy applications. A variety of photocatalysts have shown activity for water splitting. In particular, oxysulfides are the great interest because of their ability to generate H2 and O2 from water under visible light. However, they are generally synthesized under H2S flow, which is an extremely harmful gas for humans. In this study, La2O2S2 was synthesized at low temperature without H2S gas, and its photocatalytic activity was confirmed by hydrogen generation experiments.

Synthesis of disorder–order TaON homojunction for photocatalytic hydrogen generation under visible light

2021 ◽  
Vol 56 (16) ◽  
pp. 9791-9806
Author(s):  
Jinsheng Yan ◽  
Lanqing Hu ◽  
Lingkai Cui ◽  
Qianqian Shen ◽  
Xuguang Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Generation ◽  
Photocatalytic Hydrogen Generation

Hierarchically Grown Urchinlike CdS@ZnO and CdS@Al2O3Heteroarrays for Efficient Visible-Light-Driven Photocatalytic Hydrogen Generation

2011 ◽  
Vol 116 (1) ◽  
pp. 150-156 ◽  
Author(s):  
Dipankar Barpuzary ◽  
Ziyauddin Khan ◽  
Natarajan Vinothkumar ◽  
Mahuya De ◽  
Mohammad Qureshi
Keyword(s):  
Visible Light ◽  
Hydrogen Generation ◽  
Photocatalytic Hydrogen Generation ◽  
Visible Light Driven
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