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Tungsten trioxide (WO 3) thin films are of great interest as counter electrodes in electrochromic (EC) devices such as 'smart window' for energy-efficient buildings. Uniform WO 3 nanoplates filmed as EC working electrodes were fabricated on seed-free fluorine-tin-oxide (FTO) coated glass via a facile and addictive agent-free hydrothermal process. The WO 3 nanoplates were characterised by scanning electron microscopy and the X-ray photoelectron spectroscopy. The morphological analysis of the film showed that the WO 3 nanoplates lying on the FTO glass uniformly. Fourier transform infrared spectroscopy was applied to study the vibrational information of the sample. Furthermore, uniform WO 3 nanoplates exhibit well performance of EC properties. Owing to the highly two-dimensional nanostructure, a fast switching speed of 12 and 3 s for colouration and bleaching are achieved for WO 3 film. These properties of the WO 3 nanoplates film endow its promising practical applications in smart windows.

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