In this work, WO_3 nanopowder was synthesized by an acidic co-precipitation method using sodium tungstate, nitric acid, and distilled water as precursors, while molybdenum disulfide (MoS_2)/tungsten trioxide (WO_3) nanocomposite was prepared by exfoliation of MoS_2 in WO_3 at different concentrations of MoS_2 on WO_3. All materials were analysed for their structural characteristics using X-ray diffraction (XRD) spectra. The XRD spectra confirm the formation of prepared samples. The morphology of the nanocomposites was investigated by field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). FESEM and HRTEM show that the addition of 2% MoS_2 has an insignificant effect on the morphology of WO_3 but when the MoS_2 concentration is increased to 4%, the particles' edges agglomerate and combine to create layered nanostructures that resemble flowers and join together to form a sphere. The electrochemical performance of all prepared samples was investigated using charge/discharge, chronoam-perometry, and cyclic voltammetry. The electrochemical test results show that the electrochemical properties increase after the addition of MoS_2 in WO_3 due to the large active surface area. At ±1.5 V operating voltage, The electrochro-mic and optical properties of the prepared thin films were investigated using UV/Vis spectroscopy. The MSW2 nanocomposite exhibits the highest optical transmittance of 84% in the bleached state and 25% in the coloured state with a colouration efficiency of 67 cm~2C~(-1). The MSW2 nanocomposite retains a 97% colouration efficiency after 100 cycles. The electrochromic studies show that MoS_2/WO_3 nanocomposites exhibit good results at low MoS_2 contents (ie, up to 2%). When the proportion of MoS_2 in WO_3 is increased (above 2%), the electrochromic performance decreases due to the deterioration of the transmittance (T%) of the nanocomposite.
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