Polymer electrolyte membrane fuel cells (PEMFCs) have long been limited by the elecrrocatalyst used. Slow reaction kinetics and the use of platinum restrict fuel cell marketability. Investigation of supported platinum monolayers has provided a route to both minimize use of the precious metal and tune the reactivity. Highly faceted nanoparticles (NPs) have been shown to exhibit favorable electrocatalytic activity, however the fundamentals of this enhancement are not understood. Faceting of single crystals provides a well-defined template surface from which we can gain insight into the reaction fundamentals of highly faceted NPs.
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