Biaxially strained PtPb/Pt core/shell nanoplate boosts oxygen reduction catalysis
Lingzheng Bu1, Nan Zhang1, Shaojun Guo2,3,4,*（郭少军）, Xu Zhang5, Jing Li6, Jianlin Yao1, Tao Wu1, Gang Lu5, Jing-Yuan Ma7, Dong Su6,*,Xiaoqing Huang1,*（黄小青）
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.
2Department of Materials Science and Engineering, and Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China.
3The Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), College of Engineering, Peking University, Beijing 100871, China.
4Key Laboratory of Theory and Technology of Advanced Batteries Materials, College of Engineering, Peking University, Beijing 100871, China.
5Department of Physics and Astronomy, California State University, Northridge, CA 91330, USA.
6Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA.
7Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China.
Science 16 Dec 2016:Vol. 354, Issue 6318, pp. 1410-1414
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.
链接：http://science.sciencemag.org/content/354/6318/1410