Synthesis of Pd9Ru@Pt nanoparticles for oxygen reduction reaction in acidic electrolytes

JOURNAL OF POWER SOURCES

卷:277

Article

Sun, Yu¹  Hsieh, Yu-Chi²  Chang, Li-Chung¹  Wu, Pu-Wei³  Lee, Jyh-Fu⁴ 

[1] Natl Chiao Tung Univ, Grad Program Sci & Technol Accelerator Light Sour, Hsinchu 300, Taiwan

[2] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA

[3] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

关键词: Palladium;    Ruthenium;    Platinum;    Oxygen reduction reaction;    Core-shell nanoparticles;   

DOI  :  10.1016/j.jpowsour.2014.11.102

来源: Elsevier

【 摘 要 】

Nanoparticles of PdRu, Pd3Ru, and Pd9Ru are synthesized and impregnated on carbon black via a wet chemical reflux process. X-ray diffraction patterns of the as-synthesized samples, PdxRu/C (x = 1/3/9), suggest successful formation of alloy without presence of individual Pd and Ru nanoparticles. Images from transmission electron microscope confirm irregularly-shaped nanoparticles with average size below 3 nm. Analysis from extended X-ray absorption fine structure on both Pd and Ru K-edge absorption profiles indicate the Ru atoms are enriched on the surface of PdxRu/C. Among these samples, the Pd9Ru/C exhibits the strongest electrocatalytic activity for oxygen reduction reaction (ORR) in an oxygen-saturated 0.1 M aqueous HClO4 solution. Subsequently, the Pd9Ru/C undergoes Cu under potential deposition, followed by a galvanic displacement reaction to deposit a Pt monolayer on the Pd9Ru surface (Pd9Ru@Pt). The Pd9Ru@Pt reveals better ORR performance than that of Pt, reaching a mass activity of 0.38 mA mu g(pt)(-1), as compared to that of commercially available Pt nanopartides (0.107 mA mu g(pt)(-1)). The mechanisms responsible for the ORR enhancement are attributed to the combined effects of lattice strain and ligand interaction. In addition, this core-shell Pd9Ru@Pt electrocatalyst represents a substantial reduction in the amount of Pt consumption and raw material cost. (C) 2014 Elsevier B.V. All rights reserved.

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