Development of New Photocatalytic Water Splitting into H2 and O2 using Two Different Semiconductor Photocatalysts and a Shuttle Redox Mediator IO3-/I-
Top Cited Papers
- 1 August 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 109 (33) , 16052-16061
- https://doi.org/10.1021/jp052848l
Abstract
A new type of photocatalytic reaction that splits water into H2 and O2 was designed using a two-step photoexcitation system composed of an iodate/iodide (IO3-/I-) shuttle redox mediator and two different photocatalysts, one for H2 evolution and the other for O2 evolution. Photocatalytic oxidation of water to O2 and reduction of IO3- to I- selectively proceeded with good efficiencies over TiO2-rutile and Pt-WO3 photocatalysts under UV and visible light irradiations, respectively. The O2 evolution selectively proceeded even in the presence of a considerable amount of I- in the solutions, although the oxidation of water is thermodynamically less favorable than oxidation of I-. Both the adsorption property of IO3- anions and the oxidation property of the photocatalysts are doubtless responsible for the selective oxidation of water. On the other hand, photocatalytic reduction of water to H2 and oxidation of I- to IO3- proceeded over Pt-TiO2-anatase and Pt-SrTiO3:Cr/Ta (codoped with Cr and Ta) photocatalysts under UV and visible light, respectively. The combination of two different photocatalysts results in a stoichiometric evolution of H2 and O2 via the redox cycle of IO3- and I-. The photocatalytic water splitting under visible light irradiation (λ > 420 nm) was demonstrated by using the Pt-SrTiO3:Cr/Ta, Pt-WO3, and IO3-/I- shuttle redox mediator.Keywords
This publication has 15 references indexed in Scilit:
- H2 evolution from an aqueous methanol solution on SrTiO3 photocatalysts codoped with chromium and tantalum ions under visible light irradiationJournal of Photochemistry and Photobiology A: Chemistry, 2004
- Crystal faces of rutile and anatase TiO2 particles and their roles in photocatalytic reactionsNew Journal of Chemistry, 2002
- Selective Formation of Nanoholes with (100)-Face Walls by Photoetching of n-TiO2 (Rutile) Electrodes, Accompanied by Increases in Water-Oxidation PhotocurrentThe Journal of Physical Chemistry B, 2000
- A Novel Aqueous Process for Preparation of Crystal Form-Controlled and Highly Crystalline BiVO4 Powder from Layered Vanadates at Room Temperature and Its Photocatalytic and Photophysical PropertiesJournal of the American Chemical Society, 1999
- Splitting of water by electrochemical combination of two photocatalytic reactions on TiO2 particlesJournal of the Chemical Society, Faraday Transactions, 1998
- Unique Effects of Iron(III) Ions on Photocatalytic and Photoelectrochemical Properties of Titanium DioxideThe Journal of Physical Chemistry B, 1997
- A highly active photocatalyst for overall water splitting with a hydrated layered perovskite structureJournal of Photochemistry and Photobiology A: Chemistry, 1997
- Nickel-loaded K4Nb6O17 photocatalyst in the decomposition of H2O into H2 and O2: Structure and reaction mechanismJournal of Catalysis, 1989
- Photocatalytic decomposition of water into hydrogen and oxygen over nickel(II) oxide-strontium titanate (SrTiO3) powder. 1. Structure of the catalystsThe Journal of Physical Chemistry, 1986
- Competitive photoelectrochemical oxidation of reducing agents at the titanium dioxide photoanodeJournal of the American Chemical Society, 1979