Platinum-Coated Cobalt Nanowires as Oxygen Reduction Reaction Electrocatalysts

Bryan Pivovar, Shaun Alia, Kenneth Neyerlin, Svitlana Pylypenko, David Cullen, Shyam Kocha

Research output: Contribution to journalArticlepeer-review

60 Scopus Citations

Abstract

Cobalt nanowires (CoNWs) are coated with platinum (Pt) by partial galvanic displacement, forming core/shell wires 200-300 nm in diameter and 100-200 μm in length. Pt-coated CoNWs (PtCoNWs) are characterized for activity in the oxygen reduction reaction (ORR) with rotating disk electrode half-cells in 0.1 M perchloric acid electrolytes. The resulting catalysts demonstrate ORR-specific activities in the range 2053-2783 μA cmPt-2, comparable to the specific activity of polycrystalline Pt. The specific activities of PtCoNWs increase with decreasing Pt content and exhibit a corresponding increase in Pt lattice compression. PtCoNWs have exhibited a maximum mass activity of 793 mA mgPt-1, 2.6 times greater than carbon-supported Pt nanoparticles.

Original languageAmerican English
Pages (from-to)2680-2686
Number of pages7
JournalACS Catalysis
Volume4
Issue number8
DOIs
StatePublished - Aug 2014

NREL Publication Number

  • NREL/JA-5900-61516

Keywords

  • electrochemistry
  • extended surfaces
  • fuel cells
  • galvanic displacement
  • oxygen reduction reaction

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