Long-term behaviour of tungsten oxide hydrate gels in an alkali containing aqueous environment

Research output: Contribution to journalConference article

12 Citations (Scopus)


The room temperature ageing process of tungsten oxide dihydrate grains (H2WO4·H2O) prepared by the methods of Zocher and Jacobson (Kolloidchem. Beih. 28 (1929) 167) and Freedman (J. Am. Chem. Soc. 81 (1959) 3834) has been studied. A comparison between these two preparation methods and the ageing characteristics is reported. Zocher and Jacobson-type grains, spindle like in shape, have a strong tendency to morphological conversion depending on the pH value of the surrounding aqueous solution. Under the same conditions the Freedman-type irregularly shaped particles preserve their morphology. Scanning electron microscopy and Fourier transform infrared spectroscopy studies have shown that this structural and morphological stability of Freedman-type grains can be altered by the presence of alkaline (Li+, Na+, K+) and NH4+ ions. A limited incorporation of cations into the tungstate structure was observed.

Original languageEnglish
Pages (from-to)577-590
Number of pages14
JournalSolar Energy Materials and Solar Cells
Issue number4
Publication statusPublished - Apr 1 2003
EventPhotovoltaics and Photoactive Materials - Properties, Technology (PV NATO ASI) - Sozopol, Bulgaria
Duration: Sep 1 2001Sep 1 2001


  • Ageing
  • Ion insertion
  • Tungsten oxide hydrate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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