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Eliminating dissolution of platinum-based electrocatalysts at the atomic scale

Journal Article · · Nature Materials
 [1];  [1];  [1];  [2];  [3];  [1];  [4];  [5];  [1];  [6];  [1];  [7];  [1];  [1];  [4];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Belgrade (Serbia)
  4. Univ. of Wisconsin, Madison, WI (United States)
  5. Doshisha Univ., Kyoto (Japan)
  6. Drexel Univ., Philadelphia, PA (United States)
  7. 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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