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Characterization of TiO2-based semiconductors for photocatalysis by electrochemical impedance spectroscopy.
- Source :
-
Applied Surface Science . Nov2016, Vol. 387, p183-189. 7p. - Publication Year :
- 2016
-
Abstract
- 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 TiO 2 -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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 387
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 117316796
- Full Text :
- https://doi.org/10.1016/j.apsusc.2016.06.101