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Effect of Porphyrin Molecular Structure on Water Splitting Activity of a KTaO3 Photocatalyst

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.
Academic Editor: Bunsho Ohtani
Catalysts 2016, 6(3), 42;
Received: 15 January 2016 / Revised: 12 February 2016 / Accepted: 22 February 2016 / Published: 10 March 2016
(This article belongs to the Special Issue Photocatalytic Water Splitting-1)
PDF [10530 KB, uploaded 10 March 2016]


Photocatalytic water splitting is one of the ideal methods for solving the global energy crisis and its associated environmental problems. In this study, the effect of altering the molecular structure of porphyrins was investigated to improve the water splitting activity of Zr-doped KTaO3 (KTa(Zr)O3) modified with porphyrin dyes. UV-vis spectra indicated that porphyrins with long alkoxy chains tended to form well-developed H-aggregates on the KTa(Zr)O3 surface. The photocatalytic activity of Pt-loaded KTa(Zr)O3 was improved by using porphyrins with longer alkoxy chains because of the improvement in the charge migration between porphyrin dye molecules. While the charge transfer between the inorganic semiconductor and porphyrin dye interface is important, it was found that the formation of H-aggregation was more effective in improving the water splitting activity of the porphyrin-modified photocatalysts. View Full-Text
Keywords: water splitting; alkali tantalate; porphyrin; photocatalyst; hydrogen water splitting; alkali tantalate; porphyrin; photocatalyst; hydrogen

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Hagiwara, H.; Higashi, K.; Watanabe, M.; Kakigi, R.; Ida, S.; Ishihara, T. Effect of Porphyrin Molecular Structure on Water Splitting Activity of a KTaO3 Photocatalyst. Catalysts 2016, 6, 42.

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