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A facile, highly efficient approach to obtain molybdenum trioxide (MoO 3 )-doped tungsten trioxide (WO 3 ) is reported. An annealing process was used to transform ammonium tetrathiotungstate [(NH 4 ) 2 WS 4 ] to WO 3  in the presence of oxygen. Ammonium tetrathiomolybdate [(NH 4 ) 2 MoS 4 ] was used as a dopant to improve the film for use in an electrochromic (EC) cell. (NH 4 ) 2 MoS 4  at different concentrations (10, 20, 30, and 40 mM) was added to the (NH 4 ) 2 WS 4  precursor by sonication and the samples were annealed at 500 °C in air. Raman, X-ray diffraction, and X-ray photoelectron spectroscopy measurements confirmed that the (NH 4 ) 2 WS 4  precursor decomposed to WO 3  and the (NH 4 ) 2 MoS 4 –(NH 4 ) 2 WS 4  precursor was transformed to MoO 3 -doped WO 3  after annealing at 500 °C. It is shown that the MoO 3 -doped WO 3  film is more uniform and porous than pure WO 3 , confirming the doping quality and the privileges of the proposed method. The optimal MoO 3 -doped WO 3  used as an EC layer exhibited a high coloration efficiency of 128.1 cm 2 /C, which is larger than that of pure WO 3  (74.5 cm 2 /C). Therefore, MoO 3 -doped WO 3  synthesized by the reported method is a promising candidate for high-efficiency and low-cost smart windows.

Facile Solution Synthesis of Tungsten Trioxide Doped with Nanocrystalline Molybdenum Trioxide for Electrochromic Devices