Abstract
A prussian blue (PB) film possesses special photoelectric properties, and therefore it can be used in dyeing industry, thin-film battery, biosensor, electrocatalytic film, electrochromic material and so on. PB electrochromic devices (ECDs) have energy saving concept, high contrast ratio, bi-stable and many other advantages. Consequently, PB ECDs fulfill the bill of energy crisis and portable display, which are the most popular issues in nowadays. Traditional EC films were thin film structures. EC materials need electrons from conductive substrate and ions from electrolyte to redox. However, the thin film structures disadvantage the electron transmission and ion diffusion and lead to slow response time and poor durability. Recently, nano-technology brings researchers new thoughts and developments, and it makes EC technology has a substantial improvement. The thesis proposes a novel PB EC structure. We use randomly conductive nano-particles as a conductive porous template and then the PB film is electro-deposited on them. This structure has high porosity; therefore, the electrolytes can easily permeate into the whole structure to increase the reaction area and redox speed. The structure also has a concept of nano-composite material, which can strengthen the whole structure to prolong the durability. We call this novel structure as a nano-composite PB (NPB) and expect that it can bring a breakthrough of EC technology.