Influence of temperature on electrochemical and electrochromic properties of naphthalenediimide-triphenylamine-based polymer

The naphtalenediimide-triphenylamine monomer (NDI-TPA) has been obtained in the multistep synthesis and it was used to the formation of thin layer of the polymer on the electrode surface via electropolymerization. The monomer contains four triphenylamine groups and it forms cross-linked multielectrochromic polymer that change its color during both oxidation and reduction processes. To investigate the influence of temperature on the electrochemical properties of the polymer coating the cyclic voltammograms at different temperatures and scan speeds have been recorded. It was found that with the increase of temperature the separation between the oxidation and reverse peaks decreases and the ipc/ipa value increases, indicating that at higher temperatures the electrochemical reaction is faster and more reversible. The influence of temperature on the electrochromic properties was also investigated and it was found that with the increase of temperature the response times become shorter, but at higher temperatures the degradation of the polymer film occurs faster.