Jump to main content
Jump to site search

Issue 19, 2009
Previous Article Next Article

Effect of potassium adsorption on the photochemical properties of titania nanotube arrays

Author affiliations

Abstract

It is demonstrated that vertically-aligned titania nanotube planar arrays fabricated by electrochemical anodization using standard potassium-containing electrolytes invariably contain a significant amount of surface-adsorbed potassium ions, hitherto undetected, that affect the titania photoelectrochemical or PEC performance. Synchrotron-based near edge X-ray absorption fine structure (NEXAFS) spectroscopy reveals the strong ionic nature of surface potassium-titania bonds that alters the PEC performance over that of pure titania nanotubes through reduction of the external electrical bias needed to produce hydrogen at maximum efficiency. This result implies that the external electrical energy input required per liter of solar hydrogen produced with potassium-adsorbed titania nanotubes may be reduced. Tailoring the potassium content may thus be an alternative means to fine-tune the photoelectrochemical response of TiO2nanotube-based PEC electrodes.

Graphical abstract: Effect of potassium adsorption on the photochemical properties of titania nanotube arrays

Back to tab navigation

Publication details

The article was received on 15 Dec 2008, accepted on 26 Feb 2009 and first published on 27 Mar 2009


Article type: Paper
DOI: 10.1039/B822501J
Citation: J. Mater. Chem., 2009,19, 2963-2967
  •   Request permissions

    Effect of potassium adsorption on the photochemical properties of titania nanotube arrays

    C. Richter, C. Jaye, E. Panaitescu, D. A. Fischer, L. H. Lewis, R. J. Willey and L. Menon, J. Mater. Chem., 2009, 19, 2963
    DOI: 10.1039/B822501J

Search articles by author

Spotlight

Advertisements