title: Surface engineering of hierarchical platinum-cobalt nanowires for efficient electrocatalysis.
abstract: Despite intense research in past decades, the lack of high-performance catalysts for fuel cell reactions remains a challenge in realizing fuel cell technologies for transportation applications. Here we report a facile strategy for synthesizing hierarchical platinum-cobalt nanowires with high-index, platinum-rich facets and ordered intermetallic structure. These structural features enable unprecedented performance for the oxygen reduction and alcohol oxidation reactions. The specific/mass activities of the platinum-cobalt nanowires for oxygen reduction reaction are 39.6/33.7 times higher than commercial Pt/C catalyst, respectively. Density functional theory simulations reveal that the active threefold hollow sites on the platinum-rich high-index facets provide an additional factor in enhancing oxygen reduction reaction activities. The nanowires are stable in the electrochemical conditions and also thermally stable. This work may represent a key step towards scalable production of high-performance platinum-based nanowires for applications in catalysis and energy conversion.
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: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.|Department of Energy and Resources Engineering, 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 91330, California, USA.
authors.forename: Xu
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Xuan
authors.initials: X
authors.lastname: Shen
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Dong
authors.initials: D
authors.lastname: Su
authors.affiliation: Department of Physics and Astronomy, California State University, Northridge 91330, California, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Lu
authors.affiliation: Testing and Analysis Center, Soochow University, Jiangsu 215123, China.
authors.forename: Xing
authors.initials: X
authors.lastname: Zhu
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: Testing and Analysis Center, Soochow University, Jiangsu 215123, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Guo
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Huang