Abstract
The hydrogen polymer electrolyte membrane (PEM) fuel cell provides enormous potential for a future with clean energy. However, due to cost and inefficiency barriers, PEM fuel cells have not yet reached widespread commercial adoption. Mass transport limitations arising from liquid water flooding in the PEM fuel cell leads to inefficiencies. If these issues become resolved, smaller and more reliable devices could be produced at a lower cost. Mass transport limitations can be minimized through the development of optimized materials, which have tailored pore structures, connectivities, conductivities, and surface wettabilities. Currently, the porous materials in PEM fuel cells have not been customized for mass transport, due to the lack of information about their structure and the dominating mass transport mechanisms. In this talk, our use of electrochemical impedance spectroscopy (EIS) techniques for investigating the role of liquid water transport in the PEM fuel cell will be discussed. I will also discuss how we combine our EIS measurements with complementary models and measurements to inform the design of next generation porous materials for advanced performance.
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