Optimizing ionomer distribution for constructing efficient Pt/ionomer interfaces: Research on improving the performance of low-platinum-loading hydrogen fuel cells.

Reducing the platinum content within membrane electrode assemblies (MEAs) of proton exchange membrane fuel cells (PEMFCs) is a strategic approach to decrease their overall costs. Nevertheless, this approach can result in significant voltage losses which are primarily attributed to the increased impedance of oxygen through the Pt-ionomer interface. In this study, the local oxygen mass transfer resistance (R) is effectively reduced by doping sulfur onto the carbon supports.