ELECTROCHEMICAL-BEHAVIOR OF PROTON-VACANCY CONDUCTING POLYMERS BASED ON POLY(OXYETHYLENE), POE, AND SULFAMIDE, NH2SO2NH2

The electrochemical stability of a series of so-called Basic Proton Conducting Polymers (or Proton-Vacancy Conducting Polymers) based on a solvating polymer (POE, poly(oxyethylene)), sulfamide and a doping agent (guanidinium cation, working as proton-vacancy inducer) is investigated using for the purpose cyclic voltammetry. The study presented here concerns doped and undoped samples of the P(OE)(n)NH2SO2NH2 system (where n=O/S stands as the ratio of monomer units per sulfamide molecule). Experimental data obtained at high sulfamide concentration (most promissing materials in terms of conductivity) and two different doping levels N/H=1 and 10% (where N/H represents the ratio of guanidine molecules added per proton extracted) indicate that the electrochemical stability range of the undoped materials is close to 1.7 V. Preliminary results suggest that the presence of the guanidinium based dopant is responsible for an oxydation reaction which limits the electroactivity domain on the anodic side.