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
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

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

Grahic Jump Location
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

Grahic Jump Location
Figure 3

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

Grahic Jump Location
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

Grahic Jump Location
Figure 5

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

Grahic Jump Location
Figure 6

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

Grahic Jump Location
Figure 7

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

Grahic Jump Location
Figure 8

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




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In