Abstract
In this work, a novel design of an active trilayer polymer membrane formed by doped polypyrrole (PPy) is presented. The PPy trilayer membrane was synthesized with a bis(trifluoro-methane)sulfonimide lithium salt (LiTFSI) dopant and was electrochemically deposited onto a gold-coated polyvinylidene fluoride porous membrane within a custom-designed electrochemical cell. The effects of the polymerization current density and activation potential on surface properties such as roughness, wrinkling, and wettability of the PPy trilayer membrane, were determined. The surface properties of membranes fabricated at five polymerization current densities, ip, were compared. These membranes were activated at potentials ranging between 0 and 2 V. The membrane fabricated with ip = 0.1 mA/cm2 exhibited the most dynamic range of surface properties as a function of activation potential, with a maximum increase in wrinkled area of 37%, surface roughness of 200%, and apparent contact angle from 55° to 96°. The actively tunable surface properties of this novel membrane provide promising opportunities for the development of surface reaction-based clean energy technologies.
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