Dealloyed Pt-based core-shell oxygen reduction electrocatalysts

Dealloyed Pt core-shell nanoparticles constitute the most active and stable bimetallic oxygen reduction catalysts for low-temperature fuel cells. Here, we review recent advances on their preparation, structural characterization, and electrocatalytic performance. Starting with bimetallic metal overlayer model systems, for which we illustrate fundamental principles of the ORR activity enhancements of dealloyed nanoparticles, we discuss progress in our understanding of structure-activity relations of dealloyed nanoparticle catalysts, both in idealized liquid-electrolyte cell formats and more realistic Membrane Electrode Assemblies (MEAs). (C) 2016 Elsevier Ltd. All rights reserved.