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DOI: 10.1039/A706273G (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 425-428

Synthesis of reduced vanadium oxides in aqueous solutions

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Chi Fo Tsang, Jaekook Kim and Arumugam Manthiram

Abstract

Reduction of aqueous sodium and potassium vanadates with aqueous ABH4 (A=Na and K) at ambient temperatures has been investigated systematically to obtain reduced vanadium oxides. Although the as-prepared samples do not show any discernible diffraction peaks, several binary crystalline oxides such as V2O3 , V3O5 , VO2 , and V6O13 , as well as ternary oxides such as Na0.33V2O5 , K0.23V2O5 , and K2V3O8 could be identified after annealing in evacuated sealed silica tubes at 580 °C. The volume and concentration of borohydrides as well as the reaction pH are found to influence the nature of the reaction products. Selected area diffraction of the as-prepared samples in transmission electron microscopy (TEM) indicates that they are nanocrystalline.

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