Effect of Alternating Current Frequency Range Variation on the Electrochromic Properties of Electrochemically Synthesized Polypyrrole Films
A simple and effective one-step synthesis based on the electrochemical impedance spectroscopy was carried out to obtain polypyrrole(PPy)thin films on the fluorine-doped SnO2 transparent conducting glass substrates.The pyrrole and p-toluenesulfonic acid(p-TSA)were chosen as raw materials to formulate reaction solutions.The effect of the variation of the alternating current frequency range in the electrochemical synthesis on the structure and electrochromic properties of the prepared polypyrrole films was investigated.The research results showed that the variation of the alternating current frequency range changed the distribution morphology of the PPy film particles based on the initial level of 0.7 V and the application of±100 mV sine wave,and the wider the frequency range variation,the smaller the film particles.The particle size was close to the nanoscale.The best electrochromic performance of the prepared PPy films was achieved when the alternating current frequency range was 10-1-103 Hz,and the light modulation amplitude reached 65.4%at 800 nm.The film also had a rapid electrochromic response with the coloring and bleaching switching times of 5 s and 6.5 s respectively,and the coloring efficiency reached 137.4 cm2·C-1.The retention rate of light modulation amplitude after 100 electrochromic cycles was 65.7%.
electrochromismpolypyrrolealternating current frequencyelectrochemical impedance spectroscopy
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