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Catalysts 2013, 3(3), 614-624; doi:10.3390/catal3030614

Dye Modification Effects on TaON for Photocatalytic Hydrogen Production from Water

Department of Applied Chemistry, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan
International Institute for Carbon-Neutral Energy Research (I2CNER), Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan
Author to whom correspondence should be addressed.
Received: 23 April 2013 / Revised: 26 June 2013 / Accepted: 17 July 2013 / Published: 23 July 2013
(This article belongs to the Special Issue Photocatalysts)
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Modification effects of porphyrin dyes on the photocatalytic activity of tantalum (oxy)nitride (TaON) were investigated. The nitrogen content in tantalum (oxy)nitride was increased by increasing the heat treatment period. The optimized nitridation conditions were found to be calcination at 800 °C for 14 h under a NH3 gas flow (25 mL min−1). Among the porphyrin dyes examined, pentamethylene bis[4-(10,15,20-triphenylporphine-5-yl) benzoate]-dizinc (II) (Zn-TPPD) showed the most positive effect on the photocatalytic activity of TaON for H2 production from Na2S aqueous solution. From the results of the photocatalytic reaction using various combinations of catalyst components, it was found that the modification dye and PtOx co-catalysts were necessary to achieving photocatalytic H2 formation. In the PtOx/Zn-TPPD/TaON photocatalyst, the expected charge transfer mechanism was a two-step excitation of both TaON and Zn-TPPD, and the oxidation and reduction sites were TaON and PtOx co-catalyst, respectively. These results indicate that dye modification has the potential to improve the photocatalytic activity of various (oxy)nitride photocatalysts. View Full-Text
Keywords: (oxy)nitride; porphyrin; photocatalyst; hydrogen (oxy)nitride; porphyrin; photocatalyst; hydrogen
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hagiwara, H.; Nagatomo, M.; Seto, C.; Ida, S.; Ishiahara, T. Dye Modification Effects on TaON for Photocatalytic Hydrogen Production from Water. Catalysts 2013, 3, 614-624.

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