Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2015 Jul 6:5:11949.
doi: 10.1038/srep11949.

Core-shell Au@Pd nanoparticles with enhanced catalytic activity for oxygen reduction reaction via core-shell Au@Ag/Pd constructions

Dong Chen  1 , Chengyin Li  1 , Hui Liu  2 , Feng Ye  2 , Jun Yang  2
Affiliations

Core-shell Au@Pd nanoparticles with enhanced catalytic activity for oxygen reduction reaction via core-shell Au@Ag/Pd constructions

Dong Chen et al. Sci Rep. .

Abstract

Core-shell nanoparticles often exhibit improved catalytic properties due to the lattice strain created in these core-shell particles. Herein, we demonstrate the synthesis of core-shell Au@Pd nanoparticles from their core-shell Au@Ag/Pd parents. This strategy begins with the preparation of core-shell Au@Ag nanoparticles in an organic solvent. Then, the pure Ag shells are converted into the shells made of Ag/Pd alloy by galvanic replacement reaction between the Ag shells and Pd(2+) precursors. Subsequently, the Ag component is removed from the alloy shell using saturated NaCl solution to form core-shell Au@Pd nanoparticles with an Au core and a Pd shell. In comparison with the core-shell Au@Pd nanoparticles upon directly depositing Pd shell on the Au seeds and commercial Pd/C catalysts, the core-shell Au@Pd nanoparticles via their core-shell Au@Ag/Pd templates display superior activity and durability in catalyzing oxygen reduction reaction, mainly due to the larger lattice tensile effect in Pd shell induced by the Au core and Ag removal.

PubMed Disclaimer

Figures

Figure 1
Figure 1. Synthetic strategy.
Schematic illustration to show the synthesis of core-shell Au@Pd-I nanoparticles using core-shell Au@Ag/Pd with an Au core and an Ag/Pd alloy shell as intermediate template.
Figure 2
Figure 2. Core-shell Au@Ag/Pd nanoparticles.
TEM image (a), HRTEM image (b), STEM image (c), elemental profiles in STEM mode (c,d) and STEM-EDX analysis (c,e) of core-shell Au@Ag/Pd prepared via galvanic replacement reaction between Ag shell of core-shell Au@Ag nanoparticles and Pd(acac)2 precursors.
Figure 3
Figure 3. Core-shell Au@Pd-I nanoparticles.
TEM image (a), HRTEM image (b), STEM image (c), elemental profiles in STEM mode (c,d) and STEM-EDX analysis (c,e) of core-shell Au@Pd-I prepared using core-shell Au@Ag/Pd nanoparticles as parent template.
Figure 4
Figure 4. XPS spectra.
The 3d XPS spectra of Pd in commercial Pd/C catalysts (a), core-shell Au@Pd-I (b), and core-shell Au@Pd-II (c), respectively.
Figure 5
Figure 5. Electrochemical measurements.
Negative-going linear sweep voltammograms (a) and chronoamperograms at 0.45 V (b) of core-shell Au@Pd-I nanoparticles, core-shell Au@Pd-II nanoparticles, and commercial Pd/C-JM catalysts in O2 saturated 0.1 M HClO4 electrolyte at a scan rate of 10 mV s−1 and a rotating rate of 1600 rpm.
See this image and copyright information in PMC

References

    1. Bianchini C. & Shen P. K. Palladium-based electrocatalysts for alcohol oxidation in half cells and in direct alcohol fuel cells. Chem. Rev. 109, 4183–4206 (2009). - PubMed
    1. Zhang S., Shao Y., Yin G. & Lin Y. H. Electrostatic self-assembly of a Pt-around-Au nanocomposite with high activity towards formic acid oxidation. Angew. Chem. Int. Ed. 49, 2211–2214 (2010). - PubMed
    1. Uhm S. H., Lee H. J., Kwon Y. K. & Lee J. Y. A stable and cost-effective anode catalyst structure for formic acid fuel cells. Angew. Chem. Int. Ed. 120, 10317–10320 (2008). - PubMed
    1. Xu C., Wang H., Shen P. K. & Jiang S. P. Highly ordered Pd nanowire arrays as effective electrocatalysts for ethanol oxidation in direct alcohol fuel cells. Adv. Mater. 19, 4256–4259 (2007).
    1. Peng Z. & Yang H. PtAu Bimetallic heteronanostructures made by post-synthesis modification of Pt-on-Au nanoparticles. Nano Res. 2, 406–415 (2006).

Publication types