Core-Protected Platinum Monolayer Shell High-Stability Electrocatalysts for Fuel-Cell Cathodes

Authors


  • This work was carried out at Brookhaven National Laboratory under contract no. DE-AC02-98CH10886, with the U.S. Department of Energy, Office of Science, and supported by its Division of Chemical Sciences, Geosciences, and Biosciences, and its Division of Materials Sciences and Engineering, within the Office of Basic Energy Sciences, and Toyota Motor Corporation. We thank the National Energy Research Scientific Computing (NERSC) Center, the Center for Functional Nanomaterials at Brookhaven National Laboratory, and Prof. M. C. Lin for CPU time. Work at the NSLS was supported by the DOE BES grant DE-FG02-03ER15688. We thank Hugh Isaacs and Radoslav Atanasoski for stimulating discussions.

Abstract

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More than skin deep: Platinum monolayers can act as shells for palladium nanoparticles to lead to electrocatalysts with high activities and an ultralow platinum content, but high platinum utilization. The stability derives from the core protecting the shell from dissolution. In fuel-cell tests, no loss of platinum was observed in 200 000 potential cycles, whereas loss of palladium was significant.

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