Selenium-Modified Titanium Dioxide Photochemical Diode/Electrolyte Junctions: Photocatalytic and Electrochemical Preparation, Characterization, and Model Simulations

Autor:	Eugenio J. Tacconi, Krishnan Rajeshwar, Norma R. de Tacconi, C. R. Chenthamarakshan
Rok vydání:	2005
Předmět:	Materials science Oxide Electrolyte Photochemistry Surfaces Coatings and Films Photodiode law.invention chemistry.chemical_compound chemistry law Titanium dioxide Electrode Materials Chemistry Photocatalysis Physical and Theoretical Chemistry Thin film Diode
Zdroj:	The Journal of Physical Chemistry B. 109:11953-11960
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp044156n
Popis:	The photoelectrochemical behavior of TiO2 thin film electrodes, photocatalytically modified with Se islands, is described. The TiO2 thin films were electrodeposited on transparent conducting oxide glass substrates. The resultant electrode forms a n-TiO2/p-Se "photochemical diode" which, in turn, contacts an electrolyte phase. Both transient photocurrent profiles (in response to excitation light that is switched on or off) and steady-state current-potential curves in response to chopped irradiation are considered. We show that the relative dominance of the contributions from the TiO2 and Se components to the overall response of the photochemical diode/electrolyte junction crucially depends on the wavelength distribution of the excitation light source. A simple equivalent circuit representation of this junction is presented, comprised of a photodiode in parallel with two photodiodes connected in series back-to-back. Simulations of the transient and steady-state photoelectrochemical response of this system are presented, and are shown to be in good agreement with the corresponding experimental profiles.
Databáze:	OpenAIRE
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