Atomic Imaging and Spectroscopy of Size-Dependent Degradation of Pt Bimetallic Fuel Cell Catalysts

摘要

Using aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy, we present atomic-scale insights into the size-dependent degradation of Pt-Ni bimetallic oxygen reduction catalysts. We revealed that how particle size can influence the evolution of nanoporosity in the bimetallic nanoparticles and, consequently, their near surface composition, reactivity and stability during long-term electrode potential cycling.