Nanostructure and Surface Composition of Pt and Ru Binary Catalysts on Polyaniline-Functionalized Carbon Nanotubes

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• 作者：Huang-Yu Lee ; Walter Vogel ; Peter Po-Jen Chu
• 刊名：Langmuir
• 出版年：2011
• 出版时间：December 6, 2011
• 年：2011
• 卷：27
• 期：23
• 页码：14654-14661
• 全文大小：958K
• 年卷期：v.27,no.23(December 6, 2011)
• ISSN：1520-5827

文摘

Pt鈥揜u binary catalysts were prepared on a polyaniline-functionalized multiwalled carbon nanotube (PANi/MWCNT). PANi/MWCNT composites were synthesized by the polymerization of aniline in the presence of a carbon nanotube suspension using FeSO₄ and (NH₄)₂S₂O₈ as the oxidants. The Pt鈥揜u/PANi/MWCNT catalysts were formed by the chemical reduction of H₂PtCl₆ and RuCl₃ using NaBH₄ as the reducing agent. The binary component catalyst is sharply distributed, with particle sizes ranging from 2.0 to 4.0 nm, and the Pt and Ru distributions are homogeneous when supported on PANi/MWCNT. In comparison, the binary catalyst supported on bare MWCNT displayed a Pt-rich core and a Ru-rich shell nanostructure. The surface composition deduced from CO stripping potentials confirms that the Ru surface content (蠂_Ru) is approximately 50% for the Pt鈥揜u alloy on PANi/MWCNT, and the catalyst on bare MWCNT shows nearly 70% Ru on the surface. Pt鈥揜u binary catalysts supported on PANi/MWCNT have higher activity, a higher Pt utilization efficiency, and much better durability when compared to other catalyst supports on bare MWCNT or on Vulcan XC-72.