Preparation and photocatalytic activity of Au/TiO2 lyogels for hydrogen production

2018 ◽  
Vol 2 (10) ◽  
pp. 2284-2295 ◽  
Author(s):  
Lester Martínez ◽  
Mónica Benito ◽  
Ignasi Mata ◽  
Lluís Soler ◽  
Elies Molins ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Ball Milling ◽  
Surface Area ◽  
Au Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Contact Points ◽  
Metal Support

High surface area titania lyogels have been prepared, thermally transformed into TiO2 polymorphs at 400–850 °C, and decorated by ball milling with preformed Au nanoparticles of ca. 2 nm to ensure the same contact points at the metal–support interphase.

scholarly journals Synthesizing the High Surface Area g-C3N4 for Greatly Enhanced Hydrogen Production

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 832
Author(s):  
Chengfei Wang ◽  
Tongxin Han ◽  
Chang Xin ◽  
Hui Miao
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Redox Reaction ◽  
Active Sites ◽  
High Surface ◽  
High Surface Area ◽  
Ambient Atmosphere ◽  
Diffusion Distance

Adjusting the structure of g-C3N4 to significantly enhance its photocatalytic activity has attracted considerable attention. Herein, a novel, sponge-like g-C3N4 with a porous structure is prepared from the annealing of protonated melamine under N2/H2 atmosphere (PH-CN). Compared to bulk g-C3N4 via calcination of melamine under ambient atmosphere (B-CN), PH-CN displays thinner nanosheets and a higher surface area (150.1 m2/g), which is a benefit for shortening the diffusion distance of photoinduced carriers, providing more active sites, and finally favoring the enhancement of the photocatalytic activity. Moreover, it can be clearly observed from the UV-vis spectrum that PH-CN displays better performance for harvesting light compared to B-CN. Additionally, the PH-CN is prepared with a larger band gap of 2.88 eV with the Fermi level and conduction band potential increased and valence band potential decreased, which could promote the water redox reaction. The application experiment results show that the hydrogen evolution rate on PH-CN was nearly 10 times higher than that of B-CN, which was roughly 4104 μmol h−1 g−1. The method shown in this work provides an effective approach to adjust the structure of g-C3N4 with considerable photocatalytic hydrogen evolution activity.

Ni supported high surface area CeO2–ZrO2 catalysts for hydrogen production from ethanol steam reforming

RSC Advances ◽  
2012 ◽  
Vol 2 (21) ◽  
pp. 8145 ◽  
Author(s):  
Mohamed A. Ebiad ◽  
Dalia R. Abd El-Hafiz ◽  
Radwa A. Elsalamony ◽  
Lamia. S. Mohamed
Keyword(s):  
Hydrogen Production ◽  
Surface Area ◽  
Steam Reforming ◽  
High Surface ◽  
High Surface Area ◽  
Ethanol Steam Reforming ◽  
Ethanol Steam

scholarly journals Photoreforming of Glucose over CuO/TiO2

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 477 ◽  
Author(s):  
Elnaz Bahadori ◽  
Gianguido Ramis ◽  
Danny Zanardo ◽  
Federica Menegazzo ◽  
Michela Signoretto ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Economic Analysis ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Lower Surface ◽  
Flame Synthesis ◽  
Biomass Hydrolysis ◽  
Model Molecule

Hydrogen production has been investigated through the photoreforming of glucose, as model molecule representative for biomass hydrolysis. Different copper- or nickel-loaded titania photocatalysts have been compared. The samples were prepared starting from three titania samples, prepared by precipitation and characterized by pure Anatase with high surface area, or prepared through flame synthesis, i.e., flame pyrolysis and the commercial P25, leading to mixed Rutile and Anatase phases with lower surface area. The metal was added in different loading up to 1 wt % following three procedures that induced different dispersion and reducibility to the catalyst. The highest activity among the bare semiconductors was exhibited by the commercial P25 titania, while the addition of 1 wt % CuO through precipitation with complexes led to the best hydrogen productivity, i.e., 9.7 mol H2/h kgcat. Finally, a basic economic analysis considering only the costs of the catalyst and testing was performed, suggesting CuO promoted samples as promising and almost feasible for this application.

High surface area TiO2 nanoparticles: impact of carboxylporphyrin sensitizers in the photocatalytic activity

2020 ◽  
Vol 21 ◽  
pp. 100774
Author(s):  
Caique Prado Machado de Oliveira ◽  
Ana Luísa Almeida Lage ◽  
Dayse Carvalho da Silva Martins ◽  
Nelcy Della Santina Mohallem ◽  
Marcelo Machado Viana
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area

Development of high surface area bulk W2N catalysts for hydrogen production from ammonia decomposition

2020 ◽  
Vol 45 (32) ◽  
pp. 16219-16226
Author(s):  
Seetharamulu Podila ◽  
Hafedh Driss ◽  
Sharif F. Zaman ◽  
Abdulrahim A. Al-Zahrani ◽  
Muhammad A. Daous ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Ammonia Decomposition

scholarly journals In-Situ Synthesis of Nb2O5/g-C3N4 Heterostructures as Highly Efficient Photocatalysts for Molecular H2 Evolution under Solar Illumination

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 169 ◽  
Author(s):  
Faryal Idrees ◽  
Ralf Dillert ◽  
Detlef Bahnemann ◽  
Faheem Butt ◽  
Muhammad Tahir
Keyword(s):  
Photocatalytic Activity ◽  
Charge Carrier ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Photogenerated Electron ◽  
Band Alignment ◽  
Solar Irradiation ◽  
Electron Hole ◽  
The Impact

This work focuses on the synthesis of heterostructures with compatible band positions and a favourable surface area for the efficient photocatalytic production of molecular hydrogen (H2). In particular, 3-dimensional Nb2O5/g-C3N4 heterostructures with suitable band positions and high surface area have been synthesized employing a hydrothermal method. The combination of a Nb2O5 with a low charge carrier recombination rate and a g-C3N4 exhibiting high visible light absorption resulted in remarkable photocatalytic activity under simulated solar irradiation in the presence of various hole scavengers (triethanolamine (TEOA) and methanol). The following aspects of the novel material have been studied systematically: the influence of different molar ratios of Nb2O5 to g-C3N4 on the heterostructure properties, the role of the employed hole scavengers, and the impact of the co-catalyst and the charge carrier densities affecting the band alignment. The separation/transfer efficiency of the photogenerated electron-hole pairs is found to increase significantly as compared to that of pure Nb2O5 and g-C3N4, respectively, with the highest molecular H2 production of 110 mmol/g·h being obtained for 10 wt % of g-C3N4 over Nb2O5 as compared with that of g-C3N4 (33.46 mmol/g·h) and Nb2O5 (41.20 mmol/g·h). This enhanced photocatalytic activity is attributed to a sufficient interfacial interaction thus favouring the fast photogeneration of electron-hole pairs at the Nb2O5/g-C3N4 interface through a direct Z-scheme.

Novel core–shell structured BiVO4 hollow spheres with an ultra-high surface area as visible-light-driven catalyst

CrystEngComm ◽  
2014 ◽  
Vol 16 (27) ◽  
pp. 6059-6065 ◽  
Author(s):  
Yang Lu ◽  
Yong-Song Luo ◽  
Hong-Mei Xiao ◽  
Shao-Yun Fu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Core Shell ◽  
Hydrothermal Route ◽  
Excellent Photocatalytic Activity ◽  
Visible Light Driven

Novel core–shell-structured BiVO4 hollow spheres synthesized via a simple hydrothermal route exhibit an excellent photocatalytic activity.

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