Nanovoid Photoanode

  • Author: ChemViews
  • Published Date: 23 January 2013
  • Source / Publisher: ChemSusChem/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Nanovoid Photoanode

Related Societies

Liwu Zhang and Detlef Bahnemann, Leibnitz Universit├Ąt Hannover, Germany, have developed a facile and economic method to prepare nanovoid Bi2WO6 2D ordered arrays by a simple self-assembly procedure. The arrays were then investigated as photoanodes for water splitting under visible-light irradiation.


Polystyrene (PS) particle suspensions in 1-butanol have been added dropwise onto a water reservoir to form long-range ordered monolayers. These have subsequently been collected onto conductive glass substrates. These were then dip-coated into an aqueous solution containing Bi2WO6 as an amorphous precursor.

This 2D nanoarray structure shows great potential as anode for photoelectrochemical water splitting. The electrode exhibits a much higher photocurrent density and photon-to-H2 conversion efficiency than a conventional film electrode with a similar thickness. This indicates that the 2D array structure can achieve a higher photon energy conversion efficiency even with a reduced amount of semiconductor material. The enhanced conversion efficiency is explained by a lower bulk charge-carrier recombination rate owing to a shorter hole diffusion length, larger surface area affected by the electric field in the Schottky region, and a reduced light scattering within the 2D array.


Article Views: 3218

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH