Effect of Water/Acetonitrile Ratio on Dye-Sensitized Photocatalytic H2 Evolution under Visible Light Irradiation

[+] Author and Article Information
Ryu Abe, Kazuhiro Sayama, Hideki Sugihara

 National Institute of Advanced Industrial Science and Technology Central 5, 1-1-1 Higashi, T Sukuba, 305-8565, Japan

J. Sol. Energy Eng 127(3), 413-416 (Oct 28, 2004) (4 pages) doi:10.1115/1.1878854 History: Received May 11, 2004; Revised October 28, 2004

H2 production in a water-acetonitrile solution containing iodide as an electron donor was investigated over dye-sensitized PtTiO2 photocatalysts under visible light irradiation, as a potential water-splitting system based on an iodide redox mediator. The rates of H2 evolution decreased with increasing proportion of water in the solutions, because of a decrease in the energy gap between the redox potential of I3I and the highest occupied molecular orbital levels of the dyes, which decreases the efficiency of electron transfer from I to dye.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Conceptual scheme of two-step water-splitting system using two different photocatalysts

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Figure 8

Oxidation potentials (vs Fc+∕Fc) of merocyanine dye, Ru complex, coumarin dye, and I3−∕I− redox couple in water-acetonitrile

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Figure 7

Cyclic voltamograms of ferricenium ion/ferrocene redox couple in water-acetonitrile

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Figure 6

Differential pulse voltamograms of merocyanine dye (1 mM) in water-acetonitrile (water ratio 0–100% by volume)

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Figure 5

Cyclic voltammograms of I2(1mM)∕NaI(10mM) redox couple in water-acetonitrile mixtures (water ratio 0%–100% by volume)

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Figure 4

Rates of H2 evolution from solutions containing 0.1 M Nal and vanous ratios of water to acetonitrile (5–100% water by volume) over N3–Pt∕TiO2,M–Pt∕TiO2, and C–Pt∕TiO2 under visible light irradiation

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Figure 3

Ultraviolet/visible spectra of N3 dye, merocyanine, and coumarin adsorbed onto Pt∕TiO2 particles and structures of the dyes

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Figure 2

Energy diagram of H2 production from water over dye-sensitized Pt∕TiO2 photocatalysts in the presence of I− or EDTA as an electron donor




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