Stabilization of Carbon-Supported Platinum–Rare Earth Nanoalloys during Electrochemical Activation

Abstract

Carbon-supported platinum–rare earth nanoalloys are promising electrocatalysts for the oxygen reduction reaction. However, their structure–activity–stability trends are poorly understood. Herein, we followed the evolution of Pt–Nd/C nanoalloys during the electrochemical surface conditioning, i.e., prior to the initial evaluation of electrocatalytic activity, and observed that their compositional, morphological, and structural ex situ properties are considerably modified by the electrochemical activation step. It is these stabilized properties, therefore, that should be considered when discussing the electrocatalyst beginning-of-life state for the structure–activity–stability relationships rather than those determined ex situ on the as-synthesized electrocatalyst.

Deciphering the Atomic-Scale Degradation of Carbon-Supported Platinum–Yttrium Nanoalloys during the Oxygen Reduction Reaction in Acidic Medium

“…Previously, we have reported that Pt-rare earth nanoalloys undergo significant structure transitions during the early surface conditioning step, namely, the electrochemical activation. , Such transitions, often not investigated or underestimated, do induce a considerable effect on the electrocatalyst activity and its retention. , Therefore, online ICP-MS and operando WAXS measurements were conducted to follow any possible degradation of Pt x Y/C during the electrochemical activation, see Figure .…”