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Issue 9, 2010
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Photoelectrochemical behaviour of anatase nanoporous films: effect of the nanoparticle organization

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Abstract

The photoelectrochemical behaviour of anatase thin films with different nanoarchitectures and the same active surface area (or thickness) has been studied in acidic media in the absence and in the presence of formic acid. The electrodes were composed of either wire-like nanocrystal aggregates or commercial TiO2 nanoparticles. Cyclic voltammetry in the dark reveals a larger trap concentration in the band gap for the nanoparticulate (NP) electrodes, which can be ascribed to a larger number of intergrain boundaries. Also under illumination, the behaviour for both types of anatase structures significantly differs: water photooxidation arises at more negative potentials for the nanocolumnar (NC) electrodes. In the presence of an efficient hole acceptor such as HCOOH, significantly larger photocurrents were noted for the NC films as compared with those for the NP electrodes, with the photocurrent onset also shifted towards more positive potentials for the latter. These results point to a diminished electron recombination, which can be related with a smaller concentration of intergrain boundaries, together with a more efficient HCOOH hole transfer for the wire-like nanocrystal aggregate architecture. In addition, the oxygen reduction reaction is also favoured in the case of NC electrodes.

Graphical abstract: Photoelectrochemical behaviour of anatase nanoporous films: effect of the nanoparticle organization

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Publication details

The article was received on 20 Feb 2010, accepted on 22 Apr 2010 and first published on 30 Jul 2010


Article type: Paper
DOI: 10.1039/C0NR00140F
Citation: Nanoscale, 2010,2, 1690-1698
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    Photoelectrochemical behaviour of anatase nanoporous films: effect of the nanoparticle organization

    T. Lana-Villarreal, Y. Mao, S. S. Wong and R. Gómez, Nanoscale, 2010, 2, 1690
    DOI: 10.1039/C0NR00140F

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