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

Lingzheng Bu; Nan Zhang; Shaojun Guo; Xu Zhang; Jing Li; Jianlin Yao; Tao Wu; Gang Lu; Jing-Yuan Ma; Dong Su; Xiaoqing Huang

doi:10.1126/science.aah6133

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

Science. 2016 Dec 16;354(6318):1410-1414. doi: 10.1126/science.aah6133.

Authors

Lingzheng Bu¹, Nan Zhang¹, Shaojun Guo^{2

3

4}, Xu Zhang⁵, Jing Li⁶, Jianlin Yao¹, Tao Wu¹, Gang Lu⁵, Jing-Yuan Ma⁷, Dong Su⁸, Xiaoqing Huang⁹

Affiliations

¹ College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.
² 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.
³ The Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), College of Engineering, Peking University, Beijing 100871, China.
⁴ Key Laboratory of Theory and Technology of Advanced Batteries Materials, College of Engineering, Peking University, Beijing 100871, China.
⁵ Department of Physics and Astronomy, California State University, Northridge, CA 91330, USA.
⁶ Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA.
⁷ Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China.
⁸ Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA. guosj@pku.edu.cn dsu@bnl.gov hxq006@suda.edu.cn.
⁹ College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China. guosj@pku.edu.cn dsu@bnl.gov hxq006@suda.edu.cn.

PMID: 27980207
DOI: 10.1126/science.aah6133

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.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't