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

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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.

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