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Issue 4, 2010
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Impact of adsorbed alkali ions on photoelectrochemical hydrogen production by titania nanotubes

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Abstract

While titania nanotubes are expected to have important applications in the photoelectrochemical production of hydrogen, it is found that surface-adsorbed ions on the nanotube surface, specifically alkali ions, have a significant impact on the photoelectrochemical water-splitting characteristics. Such surface-adsorbed alkali ions are invariably a result of the electrochemical fabrication process which uses an alkali-based electrolyte for the production of vertically aligned array of titania nanotubes. The presence of surface-adsorbed ions is revealed in synchrotron-based near edge X-ray absorption fine structure (NEXAFS) studies. Photoelectrochemical behavior of such surface-adsorbed titania nanotubes is found to be significantly altered when compared with pure titania nanotubes which may be explained in terms of a simple phenomenological model predicting modifications to the energy band structure of titania as a result of surface adsorption.

Graphical abstract: Impact of adsorbed alkali ions on photoelectrochemical hydrogen production by titania nanotubes

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Publication details

The article was received on 08 Oct 2009, accepted on 19 Feb 2010 and first published on 17 Mar 2010


Article type: Perspective
DOI: 10.1039/B921131B
Citation: Energy Environ. Sci., 2010,3, 427-433
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    Impact of adsorbed alkali ions on photoelectrochemical hydrogen production by titania nanotubes

    C. Richter and L. Menon, Energy Environ. Sci., 2010, 3, 427
    DOI: 10.1039/B921131B

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