Atomic scale deposition of Pt around Au nanoparticles to achieve much enhanced electrocatalysis of Pt. Issue 23 (2nd June 2017)

• Record Type: Journal Article
• Authors: Xi, Zheng; Lv, Haifeng; Erdosy, Daniel P.; Su, Dong; Li, Qing; Yu, Chao; Li, Junrui; Sun, Shouheng
• Is Part Of: Nanoscale. Volume 9:Issue 23(2017)
• Page Start: 7745
• Page End: 7749
• Publication Date: 2017-06-02
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr02711g
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We achieved atomic scale deposition of Pt around Au nanoparticles and enhanced Pt electrocatalysis for formic acid oxidation. Abstract : We report an electrochemical method to deposit atomic scale Pt on a 5 nm Au nanoparticle (NP) surface in N2 -saturated 0.5 M H2 SO4 . Pt is provided by the Pt wire counter electrode via one-step Pt wire oxidation, dissolution, and deposition realized by controlled electrochemical scanning. Scanning from 0.6–1.0 V ( vs. RHE) for 10 000 cycles gives Au98.2 Pt1.8, which serves as an excellent catalyst for the formic acid oxidation reaction, showing 41 times higher specific activity (20.19 mA cm −2 ) and 25 times higher mass activity (10.80 A mgPt −1 ) with much better CO-tolerance and stability than commercial Pt. Our work demonstrates a unique strategy to minimize the use of Pt as a catalyst for electrochemical reactions.