Preparation of graphene/W18O49 nanorod composites and their application in electrochromic performance

Reduced graphene oxide/W 18 O 49 nanorod (rGO–WNd) composites are prepared through the high-temperature thermal reduction of ammonium tungstate and graphene oxide (GO). In the as-prepared rGO–WNd, W 18 O 49 nanorods (WNd) exhibit better crystallinity and more stable properties than conventional W 18 O 49 nanowires obtained using the solvothermal method. X-ray diffraction and Raman spectra confirm the coexistence of WNd and reduced GO (rGO). The cycle stability, capacitance, and electrochromic properties of the rGO–WNd composite film exhibit significant improvement compared with those of the pure WNd film. The rGO–WNd composite film achieves the best coloration efficiency at 535 nm. Studies have shown that the diffusion of ions is promoted and the charge transfer is accelerated after adding rGO. These conditions accelerate response time.