Formation of a Porous Platinum Nanoparticle Froth for Electrochemical Applications, Produced without Templates, Surfactants, or Stabilizers

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• 作者：Dequan Yang ; Shuhui Sun ; Hui Meng ; Jean-Pol Dodelet ; Edward Sacher
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：July 22, 2008
• 年：2008
• 卷：20
• 期：14
• 页码：4677 - 4681
• 全文大小：1655K
• 年卷期：v.20,no.14(July 22, 2008)
• ISSN：1520-5002

文摘

Pt nanoparticles (NPs), synthesized via the reduction of H₂PtCl₆ by formic acid at 80 °C, formed a nanoporous froth at the upper surface of the aqueous solution in which they were produced. The NPs, brought to the surface by the escape of CO₂ bubbles produced by the reduction, partly coalesced to form a froth film with a porosity >95%. Scanning and transmission electron microscopies were used to characterize the froth morphology and the NP dimensions, and X-ray photoelectron spectroscopy was used to characterize the NP surface chemistry. The froth was found to be composed of 3−5 nm zerovalent Pt NPs. The porous froth films, which could be removed and handled, demonstrated an electroactive surface area of 168 8 m²/g Pt, more than 4 times that of a commercial colloidal Pt black, and equivalent to that of the best Pt particle/carbon black electrocatalysts.