Thin, Robust, Stable, High Performance Anion Exchnage Membranes for Elecrochemical Energy Conversion Applications
Here we discuss water and anion transport in a series of thin mechanically robust state of the rt experimental anion exchange membranes. The membranes are generally constructed from an isoprene block and a vinyl benzyl bromide block, either randomly or in di-, tri- or penta- block configurations. Post quaterniaztion leads to functionalized AEMs. We use electrochemical impedance spectroscopy to measure anion conductivity, multi-nuclear pulse field gradient spin echo NMR to measure self-diffusion, and broadband electric spectroscopy to measure the relaxation processes in these polymers. This information is coupled with microscopy and SAXS to explore the polymer morphology. Putting transport and morphology together allows us to describe a complete picture of water and anion transport in these systems.
We have begun to build direct fueled AEM fuel cells and electrolyzers for hydrogen and ammonia production from these membranes and their related ionomers. We will alos show a few examples of the AEMs practical uses in single cell devices in this talk.