Single-walled carbon nanotube buckypapers as electrocatalyst supports for methanol oxidation

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• 作者：J.M. Sieben ; A. Ans¨®n-Casaos ; M.T. Mart¨ªnez ; E. Morall¨®n
• 关键词：Carbon nanotube buckypaper ; Pt&ndash ; Ru catalyst ; Electrodeposition ; Methanol oxidation
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 November, 2013
• 年：2013
• 卷：242
• 期：Complete
• 页码：7-14
• 全文大小：2938 K

文摘

This work studies the use of various single-walled carbon nanotube (SWCNT) buckypapers as catalyst supports for methanol electro-oxidation in acid media. Buckypapers were obtained by vacuum filtration from pristine and oxidized SWCNT suspensions in different liquid media. Pt-Ru catalysts supported on the buckypapers were prepared by multiple potentiostatic pulses using a diluted solution of Pt and Ru salts (2?mM H₂PtCl₆?+?2?mM RuCl₃) in acid media. The resulting materials were characterized via SEM, TEM, EDX and ICP-OES analysis. Well dispersed rounded nanoparticles between 2 and 15?nm were successfully electrodeposited on the SWCNT buckypapers. The ruthenium content in the bimetallic deposits was between 32 and 48?at. % , while the specific surface areas of the catalysts were in the range of 72-113?m²?g^?1. It was found that the solvent used to prepare the SWCNT buckypaper films has a strong influence on the catalyst dispersion, particle size and metal loading. Cyclic voltammetry and chronoamperometry experiments point out that the most active electrodes for methanol electro-oxidation were prepared with the buckypaper supports that were obtained from SWCNT dispersions in N-methyl-pyrrolidone.