Structural and electrochemical behavior of tungsten oxide obtained by solid state reaction
Abstract Tungsten oxides have been used successfully as intercalation compounds of high performance batteries. In this communication we present a new and innovative route to obtain orthorhombic WO 3 where the crystallographic structure can be carefully controlled. X-ray diffraction data indicates that a texture is obtained in the [0 k 0] direction, whereas XPS suggests that the valence of the tungsten atom is + 6. The electrochemical behavior of the oriented sample was studied by chronopotentiometry and its charge–discharge capacity was evaluated. The results showed stable values close to 100 mA h/g after the 70th cycle, which compares favorably to the best know WO 3 compounds produced so far.