Catalysis Letters

, Volume 144, Issue 3, pp 469–477 | Cite as

Facile Preparation of Hollow Pt- and PtIr-Nanostructures with Spiky Surface for the Electro-Oxidation of Ammonia

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Abstract

In this paper, we described the facile preparation of Pt- and PtIr-based hollow nanostructures (Pt–Am and PtIr–Am), which could be achieved through a co-reduction of precious metal complexes with ammine ligands and Ni ions that were reduced to form an in situ sacrificial template. For a comparative study, other types of Pt and Ir precursors with chloride ligands, i.e., Pt–Cl and PtIr–Cl, were also employed for the preparation of Pt and PtIr-based nanostructures. In constrast to Pt–Am and PtIr–Am, both Pt–Cl and PtIr–Cl showed typical aggregated small particles. The surface composition and element distribution were also affected by the type of metal precursors employed. Owing to a dilution effect of Ir or Ni on the surface of the Pt, Pt–Cl and PtIr–Cl showed a lower electrochemically active surface area and poor catalytic performance in the electro-oxidation of ammonia. Owing to a high EAS combined with the synergic effect of Ir, PtIr–Am delivered the highest oxidation current among the catalysts studied in this work.

Graphical Abstract

Hollow Pt and PtIr nanostructures with an urchin-type surface can be easily prepared through the co-reduction of the Pt, Ir, and Ni precursor followed by a leaching of the Ni component. The prepared hollow Pt and PtIr nanostructures showed a large electrochemically active surface area and Pt-rich surface, which resulted in a better catalytic performance than commercial Pt black and aggregated particles composed of Pt and PtIr in the electro-oxidation of ammonia.

Keywords

Hollow Pt Hollow PtIr alloy Metal precursor Ammonia oxidation Fuel cell 
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Notes

Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2011-0013996) and was partly supported by Radiation Technology R&D program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning. We thank Mr. J.G.Kang at the Center for University Research Facility for his assistance in the measurement of TEM images.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Haengsoo Kim
    • 1
  • Dongsin Won
    • 1
  • Kee Suk Nahm
    • 1
    • 2
  • Pil Kim
    • 1
    • 2
  1. 1.Department of Energy Storage, Conversion EngineeringChonbuk National UniversityJeonJuRepublic of Korea
  2. 2.School of Semiconductor and Chemical EngineeringChonbuk National UniversityJeonJuRepublic of Korea

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