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

被引：20

作者：

Balázsi, C ^{[1
]}

Pfeifer, J ^{[1
]}

机构：

[1] Hungarian Acad Sci, Res Inst Tech Phys & Mat Sci, H-1525 Budapest, Hungary

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2003年 / 76卷 / 04期

关键词：

tungsten oxide hydrate; ageing; ion insertion;

D O I：

10.1016/S0927-0248(02)00268-4

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

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. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：577 / 590

页数：14

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