Abstract
A novel method for synthesizing Au@Pd core-shell nanoparticles was proposed based on photochemistry. By irradiating the mixture of Au (III) and Pd (II) ions using ultraviolet light, the Au@Pd core-shell nanoparticles were prepared. The size of the nanoparticles and the thickness of the Pd shell could be efficiently adjusted by changing the molar ratio of Au (III) to Pd (II) ion. In this way, nanoparticles with diameter in the range of 5.6~4.6 nm were obtained. The core-shell structure of the synthesized nanoparticles was showed by the characterization using UV-Vis, TEM/HR-TEM and XPS. The paper investigated the electrocatalysis performance of Au@Pd nanoparticles in the methanol catalytic oxidation reaction, as well as the electron donating effect of Au core to Pd shell and the promotion of this effect on the catalytic activity of Pd shell. The experimental results provided reference for the development of non-platinum catalysts of low-temperature fuel cell anode.
Highlights
Low-temperature fuel cells, including proton exchange membrane fuel cell (PEMFC), direct methanol fuel cell (DMFC), etc, are a kind of green energy technology which transfers the chemical energy of the fuel directly to electric energy without combustion
This indicated that in the co-reduction of Au (III) and Pd (II) ions based on photochemistry, owing to AuCl4presents higher reduction potential (AuCl4-/Au E0=+1.0 V; PdCl42-/Pd, E0=+0.6 V), Au was photoreduced as the seed in priority and autocatalyzed to nanoparticles; afterward, the Pd (II) ions in the solution were catalyzed on the surface of Au nanoparticles, forming the Au@Pd core-shell composite nano-structure
Considering the Au@Pd nanoparticles, as the molar ratio of Au to Pd reduces, the Au seeds are coated by Pd atoms gradually
Summary
Low-temperature fuel cells, including proton exchange membrane fuel cell (PEMFC), direct methanol fuel cell (DMFC), etc, are a kind of green energy technology which transfers the chemical energy of the fuel directly to electric energy without combustion. Jim Yang Lee et al[3]conducted HCOOH oxidation reaction by applying Au@Pd core-shell nanoparticles and found that the nanoparticles showed a high catalytic activity in perchloric acid medium; the small size of Au core possibly promoted the catalytic activity
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