title: Advanced catalytic performance of Au-Pt double-walled nanotubes and their fabrication through galvanic replacement reaction.
abstract: Bimetallic tubular nanostructures have been the focus of intensive research as they have very interesting potential applications in various fields including catalysis and electronics. In this paper, we demonstrate a facile method for the fabrication of Au-Pt double-walled nanotubes (Au-Pt DWNTs). The DWNTs are fabricated through the galvanic displacement reaction between Ag nanowires and various metal ions, and the Au-Pt DWNT catalysts exhibit high active catalytic performances toward both methanol electro-oxidation and 4-nitrophenol (4-NP) reduction. First, they have a high electrochemically active surface area of 61.66 m(2)  g(-1), which is close to the value of commercial Pt/C catalysts (64.76 m(2) g(-1)), and the peak current density of Au-Pt DWNTs in methanol oxidation is recorded as 138.25 mA mg(-1), whereas those of Pt nanotubes, Au/Pt nanotubes (simple mixture), and commercial Pt/C are 24.12, 40.95, and 120.65 mA mg(-1), respectively. The Au-Pt DWNTs show a markedly enhanced electrocatalytic activity for methanol oxidation compared with the other three catalysts. They also show an excellent catalytic performance in comparison with common Au nanotubes for 4-nitrophenol (4-NP) reduction. The attractive performance exhibited by these prepared Au-Pt DWNTs can be attributed to their unique structures, which make them promising candidates as high-performance catalysts.
authors.affiliation: College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu, 241000, PR China.
authors.forename: Lu
authors.initials: L
authors.lastname: Chen
authors.forename: Long
authors.initials: L
authors.lastname: Kuai
authors.forename: Xue
authors.initials: X
authors.lastname: Yu
authors.forename: Wenzheng
authors.initials: W
authors.lastname: Li
authors.forename: Baoyou
authors.initials: B
authors.lastname: Geng
keywords: electrocatalysis; gold; nanotubes; platinum; synthesis