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Redox-driven ion transfer processes accompanying p-doping and undoping were investigated for poly(3,4-ethylenedioxythiophene) (PEDOT) films. The PEDOT films were potentiostatically grown from acetonitrile solutions of monomer onto the Au electrodes of 10 MHz AT-cut quartz crystal resonators. The films were then sequentially exposed to 0.1 M LiClO 4 /CH 3 CN solution and to two deep eutectic solvent (DES) media, Ethaline 200 (choline chloride and ethylene glycol in   1:2   molar ratio) and Propaline 200 (choline chloride and propylene glycol in   1:2   molar ratio). In each case, the electron and ion transfer processes accompanying PEDOT redox switching were investigated using the EQCM. The maintenance of film electroneutrality was achieved in quite different ways in the three media. In contrast to anion transfer domination in 0.1 M LiClO 4 /CH 3 CN solution, cation transfer (in the opposite direction) was dominant in Ethaline 200. In Propaline 200, a two stage mixed mechanism was observed, with cation transfer domination in the early stages of p-doping (later stages of undoping) and anion transfer domination in the later stages of p-doping (earlier stages of undoping). The roles of thermodynamic and kinetic factors in these competitive situations were explored by observing the effect of experimental timescale (potential scan rate) in voltammetric experiments.

Ion Transfer Mechanisms Accompanying p-Doping of Poly(3,4-Ethylenedioxythiophene) Films in Deep Eutectic Solvents