Pt decorated PdAu/C nanocatalysts with ultralow Pt loading for formic acid electrooxidation |
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Authors: | Guoqin Chen Mengyin Liao Biqing Yu Yunhua Li Dong Wang Guirong You Chuan-Jian Zhong Bing H. Chen |
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Affiliation: | 1. Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, National Engineering Laboratory for Green Chemical Productions of Alcohols–Ethers–Esters, Xiamen University, 422 South Siming Road, Xiamen 361005, China;2. Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, USA |
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Abstract: | Understanding how the pathway of formic acid electrooxidation depends on the composition and structure of Pt or Pd atoms on the surface of Pd- or Pt-based nanoparticles is important for designing catalysts aiming toward active, selective, stable, and low-cost. This work reports new findings of the investigation of submonolayer Pt decorated PdAu/C nanocatalysts (donated as Pt-PdAu/C) for formic acid electrooxidation. The Pt-PdAu/C are synthesized via a spontaneous displacement reaction and characterized by an array of analytical techniques including transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The electrocatalytic activity is examined using cyclic voltammetric and chronoamperometric measurements. The results show that the as-prepared Pt-PdAu/C with an optimal Pt:Pd atomic ratio of 1:100 exhibits enhanced electrocatalytic activity for formic acid electrooxidation compared with the PdAu/C and commercial the Pt/C catalysts. The oxidation potential on the Pt-PdAu/C shifts negatively by about 200 mV compared with that of the PdAu/C. The enhanced electrocatalytic activity and stability are attributed to the replacement of the Pd atom layer by Pt atoms, which significantly reduces the presence of the so-called "three neighboring site" of Pd or Pt atoms in the Pt-PdAu/C to efficiently suppress CO formation. The enhanced activity/stability and ultralow Pt loading of the Pt-PdAu/C have implications to the development of commercially-viable catalysts for application in direct formic acid fuel cells and catalysis. |
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Keywords: | Core-shell nanocatalyst Displacement reaction Fuel cells Platinum submonolayer Formic acid electrooxidation |
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