Electrochromism: Li-doping WO3 Film

When it comes to electrochromism, especially inorganic electrochromic materials, many people think of tungsten trioxide, and some people think of doped tungsten oxide films, among which Li-doping WO3 films are also expected to occupy a place. Certainly, there are also some people who think of the electrochemical performance test of Li-doped tungsten oxide film.

Specifically, the experts used the three-electrode method to complete the cyclic voltammetry test of the film on the CHI electrochemical workstation. The substrate coated with the tungsten trioxide film was clamped as the working electrode, the calomel electrode was used as the reference electrode, and the platinum electrode was used as the counter electrode. The electrode has a scanning rate of 50mv/s and a scanning range of ±3V. The cyclic voltammogram of Li-doping WO3 film is as follows:

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As can be seen from the above figure, among the seven samples tested, the performance of No.15 is the best, whose cycle area is the largest, and the charge surface density is the largest. When Li+ is injected, the film begins to turn blue, and the cathode peak is 8.90mA. When Li+ was extracted, the film began to fade and the anode peak was 3.80mA. According to the timing estimation, the No.15 sample has good electron injection and extraction performance and the color change response is within 15s, and the color change response required to prepare the device must be less than 60s.

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