Method for testing and analysis of cyclic stability of electrochromic materials using multi-cycle and double potential step chronocoulometry

摘要

A cyclic stability testing method of electrochromic materials based on multi-cycle and double potential step chronocoulometry is described herein. The method belongs to the area of function material testing and analyzing technology. Testing of the electrochromic film may be implemented through multi-cycle and double potential step technology. The extracted charge quantity Q_ex and the injected charge quantity Q_in, reversibility R of the film cyclic can be obtained by Q_ex/Q_in directly. Evaluation requirements of electrochromic materials cyclic performance may be satisfied. This technology divides overall response charges into three parts which are Faraday charge quantity Q_f, adsorption charge quantity Q_ads and electric double layer charge quantity Q_dl. Influencing factors of ion, electron transmission characteristics, and film cyclic stability can be judged by comparing the changing status of Q_f and Q_dl+nFAΓ under the multi-cyclic condition, which is convenient for researching and modifying of film electrochromic performance and life cycles.