| Summary: | NiO is a common electrochromic material, and element doping modification is an important method to improve electrochromic properties of NiO films. Cu doped NiO films were prepared by electrodeposition in ionic liquid solution, and the effect of Cu doping on the electrochromic properties of NiO films was studied. The results show that the electrochromic properties of Cu doped NiO films are significantly improved compared with pure NiO films. When the Cu doping content is 6% (atomic fraction, the same below), the light modulation range of the film is the largest, which is 54.7%, and the coloring efficiency is the highest, which is 61.54 cm2/C. When the Cu doping content is 12%, the coloring and fading response time of the film is the shortest, reaching 2.7 s and 2.6 s, respectively. The phase structure of the film is face centered cubic crystalline Ni1-xCuxO and the film is composed of nanoparticles. There are a large number of pores on the surface which are conducive to ion diffusion.
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