Record link: 
http://hdl.handle.net/20.500.12708/151409
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Title: 
Oxygen vacancies and interfaces enhancing photocatalytic hydrogen production in mesoporous CNT/TiO₂ hybrids
en
Citation: 
Moya, A., Cherevan, A., Marchesan, S., Gebhardt, P., Prato, M., Eder, D., & Vilatela, J. J. (2015). Oxygen vacancies and interfaces enhancing photocatalytic hydrogen production in mesoporous CNT/TiO₂ hybrids. Applied Catalysis B: Environmental, 179, 574–582. https://doi.org/10.1016/j.apcatb.2015.05.052
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Publisher DOI: 
10.1016/j.apcatb.2015.05.052
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Moya, Alicia 
Cherevan, Alexey 
Marchesan, Silvia 
Gebhardt, Paul 
Prato, Maurizio 
Eder, Dominik 
Vilatela, Juan J. 
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Journal: 
Applied Catalysis B: Environmental 
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ISSN: 
0926-3373
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Date (published): 
Dec-2015
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Number of Pages: 
9
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Publisher: 
ELSEVIER
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Peer reviewed: 
Yes
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Keywords: 
General Environmental Science; Catalysis; Process Chemistry and Technology; Interface; Hybrid; CNT/TiO2; Oxygen vacancies; Hydrogen production
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Abstract: 
We demonstrate a unique route towards hierarchical assemblies of mesoporous TiO₂ and CNT/TiO₂ photocatalysts by a combination of electrospinning and sol-gel methods. The resulting materials exhibit a mesoporous network of highly crystalline, well-connected inorganic nanocrystals with an order of magnitude higher photocatalytic activity than individualised TiO₂ nanoparticles. The in-situ combination of small amounts of MWCNTs with TiO₂ to form an electrospun CNT/TiO₂ hybrid further enhanced the oxide photoactivity considerably, reaching hydrogen evolution rates of 1218 μmol/h in water splitting in the presence of sacrificial reagents under UV irradiation. We also discuss the effect of oxygen vacancies on the oxide crystallisation and phase transformation. These vacancies lead to inter-bandgap states and a lower flat band potential that facilitates the photocatalytic process.
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Research Areas: 
Climate Neutral, Renewable and Conventional Energy Supply Systems: 20%
Composite Materials: 40%
Surfaces and Interfaces: 40%
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Science Branch: 
Chemie
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