Eliminating dissolution of platinum-based electrocatalysts at the atomic scale
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Johns Hopkins Univ., Baltimore, MD (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Belgrade (Serbia)
- Univ. of Wisconsin, Madison, WI (United States)
- Doshisha Univ., Kyoto (Japan)
- Drexel Univ., Philadelphia, PA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Deployment of proton-exchange membrane fuel cells is limited by the durability of Pt-nanoscale catalysts during cathodic oxygen reduction reactions. Dissolution processes on single crystalline and thin film surfaces are now correlated leading to the design of PtAu catalysts with suppressed dissolution. A remaining challenge for the deployment of proton-exchange membrane fuel cells is the limited durability of platinum (Pt) nanoscale materials that operate at high voltages during the cathodic oxygen reduction reaction. In this work, atomic-scale insight into well-defined single-crystalline, thin-film and nanoscale surfaces exposed Pt dissolution trends that governed the design and synthesis of durable materials. A newly defined metric, intrinsic dissolution, is essential to understanding the correlation between the measured Pt loss, surface structure, size and ratio of Pt nanoparticles in a carbon (C) support. It was found that the utilization of a gold (Au) underlayer promotes ordering of Pt surface atoms towards a (111) structure, whereas Au on the surface selectively protects low-coordinated Pt sites. Finally, this mitigation strategy was applied towards 3 nm Pt3Au/C nanoparticles and resulted in the elimination of Pt dissolution in the liquid electrolyte, which included a 30-fold durability improvement versus 3 nm Pt/C over an extended potential range up to 1.2 V.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231; AC02-06CH11357; AC05-00OR22725; FG02-05ER15731
- OSTI ID:
- 1756422
- Alternate ID(s):
- OSTI ID: 1854492
- Journal Information:
- Nature Materials, Journal Name: Nature Materials Journal Issue: 11 Vol. 19; ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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