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Title: Biaxially strained PtPb/Pt core/shell nanoplate boosts oxygen reduction catalysis

Compressive surface strains have been necessary to boost oxygen reduction reaction (ORR) activity in core/shell M/Pt catalysts (where M can be Ni, Co, Fe). We report a class of PtPb/Pt core/shell nanoplate catalysts that exhibit large biaxial tensile strains. The stable Pt (110) facets of the nanoplates have high ORR specific and mass activities that reach 7.8 milliampere per centimeter square and 4.3 ampere per milligram of platinum at 0.9 volts versus the reversible hydrogen electrode (RHE), respectively. Density functional theory calculations revealed that the edge-­Pt and top (bottom)-Pt (110) facets undergo large tensile strains that help optimize the Pt-­O bond strength. The intermetallic core and uniform 4 layers of Pt shell of the PtPb/Pt nanoplates appear to underlie the high endurance of these catalysts, which can undergo 50,000 voltage cycles with negligible activity decay and no apparent structure and composition changes.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [3] ;  [5] ;  [4] ;  [1]
  1. Soochow Univ., Jiangsu (China). College of Chemistry, Chemical Engineering and Materials Science
  2. Peking Univ., Beijing (China). College of Engineering, Dept. of Materials Science and Engineering and Dept. of Energy and Resources Engineering; Peking Univ., Beijing (China). College of Engineering, Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT); Peking Univ., Beijing (China). College of Engineering, Key Lab. of Theory and Technology of Advanced Batteries Materials
  3. California State Univ. (CalState), Northridge, CA (United States). Dept. of Physics and Astronomy
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  5. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Synchrotron Radiation Facility, Shanghai Inst. of Applied Physics
Publication Date:
Report Number(s):
BNL-113227-2016-JA
Journal ID: ISSN 0036-8075; R&D Project: 16060; 16060; KC0403020
Grant/Contract Number:
SC0012704; W911NF-11-1-0353
Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 354; Journal Issue: 6318; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY, AND ECONOMY; 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; PtPb/Pt; Core/Shell Nanoplate; Oxygen Reduction; Center for Functional Nanomaterials
OSTI Identifier:
1336209