Highly Conductive, Methanol Resistant Polyelectrolyte Multilayers


  • We gratefully acknowledge funding by the DuPont–MIT Alliance. We also thank Shuo Chen for obtaining cross-sectional SEM images. Supporting Information is available online through Wiley InterScience or from the authors.


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Highly conducting, methanol resistant thin films are fabricated using layer-by-layer (LBL) assembly. Pairing a sulfonated aromatic polyether with amine-based polycations yields LBL films with ionic conductivity values up to 3.5 × 10−2 S cm−1. Uniformly coating traditional fuel cell membranes with these LBL films (see figure) improves the power output of a direct methanol fuel cell by over 50%.