Fitxa

Títol:

Hierarchical TiO2 nanofibres as photocatalyst for CO2 reduction: Influence of morphology and phase composition on catalytic activity

Materia:

CO2 photoreduction, Artificial photosynthesis, Hierarchical TiO2 fibres, Electrospinning, Sol-gel

Descripció:

In this research work, the gas phase CO2 photocatalytic reduction using water as electron donor has been performed using hierarchical assemblies of mesoporous TiO2 1-D nanofibres synthesised by a combination of electrospinning and sol–gel methods. In order to compare the effect of the crystallisation step on oxygen vacancies and conductivity, two different annealing conditions have been undertaken: under a high Ar flow (“TiO2 Fibres-A” sample) and under static Ar (“TiO2 Fibres B” sample). Moreover, these materials have been compared with individualised TiO2 nanoparticles prepared by a sol-gel procedure. CO and H2 are detected as major products with all photocatalysts, with lower amounts of CH4 and CH3OH. The TiO2 nanofibres exhibit better results than the sol-gel photocatalyst, behaviour that may be ascribed to an improved nanocrystals connection, which favours a fast charge transport along the grain boundaries, as measured by electrochemical impedance spectroscopy (EIS). The highest CO2 reduction activity is achieved with the TiO2 Fibres B catalyst, which gives rise to ca. 4 and 2.5 times higher H2 and CO production, respectively, than the TiO2 Fibres-A one. This sample is composed of a mixture of anatase and rutile crystalline phases (80:20), leading to a decrease in the electron-hole recombination rate observed by photoluminescence (PL) measurements.

Llengua:

eng

Relació:

info:eu-repo/grantAgreement/EU/H2020/Hybrid Materials for Artificial Photosynthesis/HyMAP/648319

Autor/Productor:

Reñones, Patricia

Moya, Alicia

Fresno, Fernando

Collado, Laura

Vilatela, Juan J.

de la Peña O’Shea, Víctor A.

Editor:

Journal of CO2 Utilization (ELSEVIER)

Drets:

info:eu-repo/semantics/openAccess

CC BY-NC-ND 4.0

Data:

2016-05-03T09:06:26Z

2016-04-18

Tipus de recurs:

info:eu-repo/semantics/article

Identificador del recurs:

S2212-9820(16)30030-0

doi:10.1016/j.jcou.2016.04.002

http://hdl.handle.net/11034/83

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      17. <dc:subject>CO2 photoreduction, Artificial photosynthesis, Hierarchical TiO2 fibres, Electrospinning, Sol-gel</dc:subject>

      18. <dc:title>Hierarchical TiO2 nanofibres as photocatalyst for CO2 reduction: Influence of morphology and phase composition on catalytic activity</dc:title>

      19. <dc:type>info:eu-repo/semantics/article</dc:type>

      20. <dc:rights>CC BY-NC-ND 4.0</dc:rights>

      21. <dc:source>IMDEA</dc:source>

      22. <dc:source>Instituciones</dc:source>

      23. <dc:source>IMDEA. Artículos</dc:source>

      </ow:Publication>

   </rdf:RDF>