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

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dc.contributor.authorReñones, Patricia
dc.contributor.authorMoya, Alicia
dc.contributor.authorFresno, Fernando
dc.contributor.authorCollado, Laura
dc.contributor.authorVilatela, Juan J.
dc.contributor.authorde la Peña O’Shea, Víctor A.
dc.date.accessioned2022-09-08T11:31:27Z
dc.date.available2022-09-08T11:31:27Z
dc.date.issued2016-04-18
dc.description.abstractIn 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.
dc.identifier.issnS2212-9820(16)30030-0
dc.identifier.otherdoi:10.1016/j.jcou.2016.04.002
dc.identifier.urihttps://emimasd.consorciomadrono.es/handle/11034/83
dc.language.isoeng
dc.publisherJournal of CO2 Utilization (ELSEVIER)
dc.relationinfo:eu-repo/grantAgreement/EU/H2020/Hybrid Materials for Artificial Photosynthesis/HyMAP/648319
dc.rightsopenAccess
dc.subjectCO2 photoreduction, Artificial photosynthesis, Hierarchical TiO2 fibres, Electrospinning, Sol-gel
dc.titleHierarchical TiO2 nanofibres as photocatalyst for CO2 reduction: Influence of morphology and phase composition on catalytic activity
dc.typearticle
dc.typeinfo:eu-repo/semantics/submittedVersion
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