Selvaraj V, Grace A Nirmala, Alagar M
Department of Chemistry, University College of Engineering-Villupuram, Anna University, Chennai 600 025, India.
J Colloid Interface Sci. 2009 May 1;333(1):254-62. doi: 10.1016/j.jcis.2009.01.020. Epub 2009 Jan 15.
A potent catalyst has been prepared consisting of platinum (Pt), and platinum-palladium (Pt-Pd) nanoparticles supported on purified single-walled carbon nanotubes (Pt/CNT and Pt-Pd/CNT). Electrochemical characteristics of formic acid and formaldehyde oxidation on these catalysts are investigated via cyclic voltammetric analysis in mixed 0.5 M HCOOH (or 0.5 M HCHO) and 0.5 M H(2)SO(4) solutions. The results imply that the Pt-Pd/CNT electrodes exhibit a better activity than the corresponding Pt nanoparticles modified SWCNT electrodes. The modified electrode exhibits significant electrocatalytic activity towards formic acid and formaldehyde oxidation, which may be attributed due to the uniform dispersion of nanoparticles on SWCNTs and the efficacy of Pd species in Pt-Pd system. Such nanoparticles modified CNT electrodes exhibit better catalytic behavior towards formic acid and formaldehyde than the corresponding carbon electrodes, indicating that the system studied in the present work is the more promising system for use in fuel cells.
已制备出一种由负载在纯化单壁碳纳米管（Pt/CNT和Pt-Pd/CNT）上的铂（Pt）和铂-钯（Pt-Pd）纳米颗粒组成的高效催化剂。通过在0.5 M HCOOH（或0.5 M HCHO）和0.5 M H₂SO₄混合溶液中的循环伏安分析，研究了这些催化剂上甲酸和甲醛氧化的电化学特性。结果表明，Pt-Pd/CNT电极比相应的铂纳米颗粒修饰的单壁碳纳米管电极表现出更好的活性。修饰电极对甲酸和甲醛氧化表现出显著的电催化活性，这可能归因于纳米颗粒在单壁碳纳米管上的均匀分散以及Pt-Pd体系中钯物种的功效。这种纳米颗粒修饰的碳纳米管电极对甲酸和甲醛表现出比相应碳电极更好的催化行为，表明本工作中研究的体系是用于燃料电池的更有前景的体系。
