title: Biaxially strained PtPb/Pt core/shell nanoplate boosts oxygen reduction catalysis.
abstract: 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.
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.
authors.forename: Lingzheng
authors.initials: L
authors.lastname: Bu
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.affiliation: Department of Materials Science and Engineering, and Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China. guosj@pku.edu.cn dsu@bnl.gov hxq006@suda.edu.cn.|The Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), College of Engineering, Peking University, Beijing 100871, China.|Key Laboratory of Theory and Technology of Advanced Batteries Materials, College of Engineering, Peking University, Beijing 100871, China.
authors.forename: Shaojun
authors.initials: S
authors.lastname: Guo
authors.affiliation: Department of Physics and Astronomy, California State University, Northridge, CA 91330, USA.
authors.forename: Xu
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.
authors.forename: Jianlin
authors.initials: J
authors.lastname: Yao
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wu
authors.affiliation: Department of Physics and Astronomy, California State University, Northridge, CA 91330, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Lu
authors.affiliation: Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China.
authors.forename: Jing-Yuan
authors.initials: JY
authors.lastname: Ma
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA. guosj@pku.edu.cn dsu@bnl.gov hxq006@suda.edu.cn.
authors.forename: Dong
authors.initials: D
authors.lastname: Su
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China. guosj@pku.edu.cn dsu@bnl.gov hxq006@suda.edu.cn.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Huang