title: Surface-Limited Synthesis of Pt Nanocluster Decorated Pd Hierarchical Structures with Enhanced Electrocatalytic Activity toward Oxygen Reduction Reaction.
abstract: Exploring superior catalysts with high catalytic activity and durability is of significant for the development of an electrochemical device involving the oxygen reduction reaction. This work describes the synthesis of Pt-on-Pd bimetallic heterogeneous nanostructures, and their high electrocatalytic activity toward the oxygen reduction reaction (ORR). Pt nanoclusters with a size of 1-2 nm were generated on Pd nanorods (NRs) through a modified Cu underpotential deposition (UPD) process free of potential control and a subsequent surface-limited redox reaction. The Pt nanocluster decorated Pd nanostructure with a ultralow Pt content of 1.5 wt % exhibited a mass activity of 105.3 mA mg(-1) (Pt-Pd) toward ORR, comparable to that of the commercial Pt/C catalyst but 4 times higher than that of carbon supported Pd NRs. More importantly, the carbon supported Pt-on-Pd catalyst displays relatively small losses of 16% in electrochemical surface area (ECSA) and 32% in mass activity after 10 000 potential sweeps, in contrast to respective losses of 46 and 64% for the commercial Pt/C catalyst counterpart. The results demonstrated that Pt decoration might be an efficient way to improve the electrocatalytic activity of Pd and in turn allow Pd to be a promising substitution for commercial Pt catalyst.
authors.affiliation: †School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.affiliation: ‡School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, People's Republic of China.
authors.forename: Guojian
authors.initials: G
authors.lastname: Cao
authors.affiliation: §Testing Center, Yangzhou University, Yangzhou, 225009, People's Republic of China.
authors.forename: Qingli
authors.initials: Q
authors.lastname: Huang
authors.affiliation: †School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China.
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Ma
authors.affiliation: †School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Wan
authors.affiliation: †School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China.
authors.forename: Hong
authors.initials: H
authors.lastname: Zhao
authors.affiliation: †School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.affiliation: †School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China.
authors.forename: Xia
authors.initials: X
authors.lastname: Sun
authors.affiliation: †School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China.
authors.forename: Fujun
authors.initials: F
authors.lastname: Yin
keywords: electrocatalyst; heterogeneous nanostructure; oxygen reduction reaction; platinum; underpotential deposition