Jump to main content
Jump to site search

Issue 36, 2013
Previous Article Next Article

Core–shell catalysts consisting of nanoporous cores for oxygen reduction reaction

Author affiliations

Abstract

A comprehensive experimental study was conducted on the dealloying of PdNi6 nanoparticles under various conditions. A two-stage dealloying protocol was developed to leach >95% of Ni while minimizing the dissolution of Pd. The final structure of the dealloyed particle was strongly dependent on the acid used and temperature. When H2SO4 and HNO3 solutions were used in the first stage of dealloying, solid and porous particles were generated, respectively. The porous particles have a 3-fold higher electrochemical surface area per Pd mass than the solid ones. The dealloyed PdNi6 nanoparticles were then used as a core material for the synthesis of core–shell catalysts. These catalysts were synthesized in gram-size batches and involved Pt displacement of an underpotentially deposited (UPD) Cu monolayer. The resulting materials were characterized by scanning transmission electron microscopy (STEM) and in situ X-ray diffraction (XRD). The oxygen reduction reaction (ORR) activity of the core–shell catalysts is 7-fold higher than the state-of-the-art Pt/C. The high activity was confirmed by a more than 40 mV improvement in fuel cell performance with a Pt loading of 0.1 mg cm−2 by using the core–shell catalysts.

Graphical abstract: Core–shell catalysts consisting of nanoporous cores for oxygen reduction reaction

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 May 2013, accepted on 11 Jul 2013 and first published on 11 Jul 2013


Article type: Paper
DOI: 10.1039/C3CP52252K
Citation: Phys. Chem. Chem. Phys., 2013,15, 15078-15090

  •   Request permissions

    Core–shell catalysts consisting of nanoporous cores for oxygen reduction reaction

    M. Shao, B. H. Smith, S. Guerrero, L. Protsailo, D. Su, K. Kaneko, J. H. Odell, M. P. Humbert, K. Sasaki, J. Marzullo and R. M. Darling, Phys. Chem. Chem. Phys., 2013, 15, 15078
    DOI: 10.1039/C3CP52252K

Search articles by author

Spotlight

Advertisements