▎ 摘　　要

NOVELTY - Preparing prussian blue electrochromic film involves dissolving ferricyanide, trivalent iron salt and potassium salt in the de-ionized water to obtain uniform solution, electrically contacting the conductive substrate and the metal, placing in the solution obtained for reaction and forming layer of prussian blue electrochromic film on the surface of the conductive substrate. USE - Method for preparing prussian blue electrochromic film used in electrochromics device and to electronic display, electronic paper and ski glasses. ADVANTAGE - The method is simple and fast, and does not need any auxiliary instrument. It is easy to realize large-scale preparation of prussian blue electrochromic film, it provides an economic and efficient way for the actual application of electro chromic device. The method uses the work function difference between the conductive substrate and the metal to realize in-situ growth of Prussian blue film, the reaction is carried out in room temperature water solution, the process is simple, fast, without strict reaction condition and instrument auxiliary, it can quickly finish the reaction, and it can be carried out at room temperature.