Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/103564
Author(s): Joana Ângelo
Pedro Magalhães
Luísa Andrade
Adélio Mendes
Title: Characterization of TiO based semiconductors for photocatalysis by electrochemical impedance spectroscopy
Issue Date: 2016
Abstract: The photocatalytic activity of a commercial titanium dioxide (P25) and of an in-house preparedP25/graphene composite is assessed according to standard ISO 22197-1:2007. The photoactivity performances of bare and composite TiO2-based materials were further studied by electrochemical impedancespectroscopy (EIS) technique to better understand the function of the graphene in the composite.EIS experiments were performed using a three-electrode configuration, which allows obtaining moredetailed information about the complex charge transfer phenomena at the semiconductor/electrolyteinterface. The Randles equivalent circuit was selected as the most suitable for modelling the presentphotocatalysts. The use of the graphene composite allows a more effective charge separation with lowercharge transfer resistance and less e−/h+ recombination on the composite photocatalyst, reflected in thehigher values of NO conversion.
Subject: Ciências Tecnológicas
Technological sciences
URI: https://hdl.handle.net/10216/103564
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/321315/Building Integrated Dye Sensitized Solar Cells/BI-DSC
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/00511/2013 - POCI-01-0145-FEDER-006939/Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia/LEPABE
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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