Surfactant-directed synthesis of ternary nanostructures: Nanocubes, polyhedrons, octahedrons, and nanowires of PtNiFe. Their shape-dependent oxygen reduction activity

Shang Wei Chou, Jing Jong Shyue, Chia Hua Chien, Chia Chun Chen, Yang Yuan Chen, Pi Tai Chou

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

We report a rational method for preparation of ternary alloy (PtNiFe) nanocrystals with various shapes. PtNiFe nanocubes, polyhedrons, and octahedrons are prepared via fine-tuning the alloy compositions and surfactants, so that the crystal facet-surfactant bindings on the growth seed can be well controlled. Nanowires grow in the cylindrical template built via high concentrations of oleylamine. In the electrocatalysis examination, it appears that the oxygen reduction reaction (ORR) activities of all PtNiFe nanostructures outperform that of commercial Pt catalyst in the electrolyte of HClO 4 or H 2SO 4. In HClO 4, the order of ORR activity is as follows: octahedrons ≈ nanowires > polyhedrons > nanocubes. PtNiFe nanostructures enclosed by a (111) plane, such as octahedrons and nanowires, give the highest ORR activities. Conversely, in H 2SO 4, the ORR activity of PtNiFe nanocubes enclosed by {100} facets is the highest among these nanostructures. The ORR activity increases in the order of nanowires ≈ octahedrons < polyhedrons, establishing a shape dependency in the ORR activity, which is valuable upon performing nanocatalysis in fuel cells.

Original languageEnglish
Pages (from-to)2527-2533
Number of pages7
JournalChemistry of Materials
Volume24
Issue number13
DOIs
Publication statusPublished - 2012 Jul 10

    Fingerprint

Keywords

  • PtNiFe
  • nanocube
  • nanowire
  • octahedron
  • oxygen reduction
  • polyhedron
  • shape control

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this