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

Lingzheng BuCollege of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, ChinaNan ZhangCollege of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, ChinaShaojun GuoDepartment of Materials Science and Engineering, and Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, ChinaXu ZhangDepartment of Physics and Astronomy, California State University, Northridge, CA 91330, USAJing LiCenter for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USAJianlin YaoCollege of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, ChinaTao WuCollege of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, ChinaGang LüDepartment of Physics and Astronomy, California State University, Northridge, CA 91330, USAJingyuan MaShanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, ChinaDong SuCenter for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USAXiaoqing HuangCollege of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China

2016en

ABI

Annotatsiya

Compressive surface strains have been necessary to boost oxygen reduction reaction (ORR) activity in core/shell M/platinum (Pt) catalysts (where M can be nickel, cobalt, or iron). We report on a class of platinum-lead/platinum (PtPb/Pt) core/shell nanoplate catalysts that exhibit large biaxial strains. The stable Pt (110) facets of the nanoplates have high ORR specific and mass activities that reach 7.8 milliampere (mA) per centimeter squared and 4.3 ampere per milligram of platinum at 0.9 volts versus the reversible hydrogen electrode (RHE), respectively. Density functional theory calculations reveal 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 four 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.

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DOI: 10.1126/science.aah6133

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