In this study, we evaluated the performance and morphological changes after voltage-cycling accelerated stability tests for Pt and PtCo catalysts supported on different carbon supports. Among the catalysts with different carbon supports, it was found that although the Pt surface area loss, strongly related to Pt dissolution, was comparable, the losses in oxygen reduction kinetics and fuel cell performance for catalysts with high-surface-area carbon were smaller. We studied and will report changes in electrochemical properties, Pt and Co redistribution, and electrode morphology. Simulation to illustrate the stability differences will also be discussed.
This work was partially supported by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy under grant DE-EE0007271.