Tungsten trioxide, as an electrochromic material, may be applied to produce a complementary electrochromic device. And the prepared electrochromic devices are often used to study their possibility and practical applicability as energy-saving windows. In recent years, the researches on energy-saving materials are increasing gradually. In this regard, as a dingal material, tungsten trioxide receiving more attention.
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According to experts, in the design of complementary devices, the mutual matching between the two electrochromic materials must be considered. That is because not any two cathode and anode electrochromic materials can form a complementary device. The match referred to here has two meanings:
1.0 The ionic conductor used must be suitable for both electrochromic materials;
2.0 The response time, the conductivity of the ions in the electrolyte, and the operating voltage of the cathode and anode electrochromic materials used should be equal or approximately equal. Otherwise, it will not play a complementary role.
