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Proton exchange membrane fuel cells hold promise as energy conversion devicesfor hydrogen-based power generation and storage. However, the slow kinetics ofthe oxygen reduction at the cathode imposes the need for highly activecatalysts, typically Pt or Pt-based, with a large available area. The scarcityof Pt increases deployment and operational cost, driving the development ofnovel highly-active material systems. As an alternative, Rh-doped PtNinanoparticle has been suggested as promising oxygen reduction catalyst, but the3D distributions of constituent elements in the nanoparticles have remainedunclear, making it difficult to guide property optimization. Here, acombination of advanced microscopy and microanalysis techniques is used tostudy the Rh distribution in the PtNi nanoparticles, and Rh surface segregationis revealed, even with an overall Rh content below 2 at. %. Our findingssuggest that doping and surface chemistry must be carefully investigated toestablish a clear link with catalytic activity can truly be established.

Exploring the Surface Segregation of Rh Dopant in PtNi Nanoparticles through Atom Probe Tomography Analysis