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

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

43 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)2527-2533
頁數7
期刊Chemistry of Materials
24
發行號13
DOIs
出版狀態已發佈 - 2012 七月 10

ASJC Scopus subject areas

  • 化學 (全部)
  • 化學工程 (全部)
  • 材料化學

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