(697a) Hydroxide Conducting Polymerized Ionic Liquid Block Copolymers for Alkaline Fuel Cells

Elabd, Y. A. - Presenter, Drexel University
Ye, Y., Drexel University
Winey, K. I., University of Pennsylvania
Wang, T. S., University of Pennsylvania

In previous work in our laboratory, we reported on the chemical stability of an imidazolium-based hydroxide conducting polymerized ionic liquid (PIL), poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazolium hydroxide) (poly(MEBIm-OH), over a broad range of humidities, temperatures, and alkaline concentrations using the combined techniques of electrochemical impedance spectroscopy and nuclear magnetic resonance spectroscopy [1]. This polymer provides a good building block for future investigations since chemical stability of hydroxide conducting polymers is a significant issue as it pertains to long-term alkaline fuel cell (AFC) operation. In this talk, we will present the hydroxide conductivity and morphology of a series of PIL diblock copolymers, poly(MMA-b-MEBIm-OH), composed of the IL monomer, MEBIm-OH, and the non-ionic monomer, methyl methacrylate (MMA), at various PIL compositions. PIL block copolymers conjoin the advantages of block copolymers and PILs: self-assembled nanostructured morphologies and unique electrochemical properties. To date, there are few reports of PIL block copolymers in the literature. Therefore, a fundamental understanding of morphology and ion transport in these materials will be highly beneficial, specifically for the optimization of AFC performance.

1. Ye, Y.; Elabd, Y.A. Relative Chemical Stability of Alkaline Exchange Polymerized Ionic Liquids. Macromolecules 2011, 44 (21), 8494-8503.

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