Characterization of TiO based semiconductors for photocatalysis by electrochemical impedance spectroscopy

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Joana Ângelo (Author) FEUP; Pedro Magalhães (Author) FEUP; Luísa Andrade (Author) FEUP; Adélio Mendes (Author) FEUP

Journal

Title: Applied Surface Science

Vol. 387

Pages: 183-189

ISSN: 0169-4332

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 21 Citations

ISI Web of Science

Scopus - 47 Citations

INSPEC

Scientific classification

CORDIS: Technological sciences

Associated Projects

BI-DSC - Building Integrated Dye Sensitized Solar Cells

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Other information

Authenticus ID: P-00M-4QH

DOI: 10.1016/j.apsusc.2016.06.101

Abstract (EN): The photocatalytic activity of a commercial titanium dioxide (P25) and of an in-house prepared P25/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 impedance spectroscopy (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 more detailed information about the complex charge transfer phenomena at the semiconductor/electrolyte interface. The Randles equivalent circuit was selected as the most suitable for modelling the present photocatalysts. The use of the graphene composite allows a more effective charge separation with lower charge transfer resistance and less e−/h+ recombination on the composite photocatalyst, reflected in the higher values of NO conversion.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7