Materials selection for bipolar plates for polymer electrolyte membrane fuel cells using the Ashby approach

In this work the Ashby approach was used to select materials for bipolar plates for polymer electrolyte membrane (PEM) fuel cells. The procedure was based on the development of a trade-off strategy based on the evaluation of the corresponding Ashby charts. A detailed analysis of relevant performance attributes for different types of materials traditionally used as bipolar plates is given. The data used in the selection process were collected from the scientific literature and from datasheets of commercial products. In this regard, graphite–polymer composites and metals are thoroughly compared owing to their mechanical, electrical and corrosion properties. The results evidenced the suitability of the Ashby approach as a reliable method to assist the designer of bipolar plates in the complex task of selecting materials that allow for the best overall performance.

► The Ashby approach was employed to select materials for PEM fuel cell bipolar plates.
► Binders with polar groups maximize the electrical conductivity of polymer–graphite composites.
► MWNTs and carbon fibers are recommended as minor fillers in addition to graphite.
► Pack chromization, nitridation and multi-layered PVD films yield the best performance for metallic plates.