Facile synthesis of catalytically active platinum nanosponges, nanonetworks, and nanodendrites

Zong Hong Lin, Meng Han Lin, Huan Tsung Chang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

81 Scopus citations

Abstract

In this paper, we report a simple approach for the preparation of various porous Pt nanomaterials (NMs) in aqueous solution. Employing different temperatures and concentrations of sodium dodecyl sulfate (SDS), we obtained Pt nanosponges, Pt nanonetworks, and Pt nanodendrites from the reduction of PtCl62- ions via galvanic replacement reactions with Te nano-wires (length: 879 nm; diameter: 19 nm). At ambient temperature, Pt nanosponges and Pt nanodendrites formed selectively in the presence of SDS at concentrations of < 10 mm and>50 mm, respectively. At elevated reaction temperatures, we obtained Pt nanonetworks and Pt nanodendrites in the presence of SDS at concentrations of <10 mm and >50mm, respectively. Transmission electron microscopy images revealed that these Pt NMs were all composed of one dimensional Pt nanostructures having widths of 3.0±1.0nm and lengths of 17.0± 4.8 nm. Cyclic voltammetry data indicated that the as-prepared Pt nanonet- works, nanosponges, and nanodendrites possessed large electrochemically active surface areas (77.0, 70.4, and 41.4 m2g-1, respectively). For the electrocatalytic oxidation of methanol, the ratio of the forward oxidation peak current (If) to the backward peak current (Ib) of the Pt nanodendrites, nanosponges, and nanonetworks were all high (If/Ib = 2.88, 2.66, and 2.16, respectively). These three NMs exhibit greater electrocatalytic activities and excellent tolerance toward poisoning species for the oxidation of methanol when compared with the performance of standard Pt NMs.

Original languageEnglish
Pages (from-to)4656-4662
Number of pages7
JournalChemistry - A European Journal
Volume15
Issue number18
DOIs
StatePublished - 27 04 2009
Externally publishedYes

Keywords

  • Electrocalalysis
  • Nano-materials
  • Platinurn
  • Sodium dodecyl sulfate
  • Tellurium

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