Controlled platinum nanoparticles uniformly dispersed on nitrogen-doped carbon nanotubes for methanol oxidation

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题名:	Controlled platinum nanoparticles uniformly dispersed on nitrogen-doped carbon nanotubes for methanol oxidation
作者:	Du, H. -Y. Wang, C. -H. Hsu, H. -C. Chang, S. -T. Chen, U. -S. Yen, S. C. Chen, L. C. Shih, H. -C. Chen, K. H.
贡献者:	化材系
关键词:	fuel cell carbon nanotube methanol oxidation platinum nanoparticle zeta potential
日期:	2008
上传时间:	2009-11-06 13:57:50 (UTC+8)
摘要:	This work presents the synthesis of platinum nanoparticles (Pt NPs) and their subsequent deposition on the nitrogen-doped carbon nanotubes, which have been directly grown on a carbon cloth (CNT-CC electrode). The CNT-CC electrode provides a fast electron-transfer path to the carbon cloth, resulting in energy-loss reduction and enhancing catalytic activity of Pt NPs. The N-dopants in CNT serve as the defect sites to enhance nucleation of Pt particles. The reduction of the Pt precursor salt was carried out in the ethylene glycol solution at an elevated temperature. In order to control the Pt NP size, the pH of the reaction solution was controlled by the addition of NaOH. Zeta potential measurements of the as-prepared sample indicate that a higher zeta potential results in a smaller particle size, due to a stronger electrostatic repulsion between NPs. This serves a powerful tool for size control of the Pt nanoparticle. The Pt NPs dispersed on the CNT-CC have an average size of 2.81 nm (Pt/CNT-CC) prepared using 15 mM NaOH, with high uniformity under electron microscopy. Cyclic voltammetry measurements of the electrocatalytic activity of the Pt/CNT-CC for methanol oxidation indicate that it exhibits excellent electrocatalytic activity and are ideal for direct methanol fuel cell applications. (C) 2008 Elsevier B.V. All rights reserved.
關聯:	DIAMOND AND RELATED MATERIALS Volume: 17 Issue: 4-5 Special Issue: Sp. Iss. SI Pages: 535-541
显示于类别:	[化學工程與材料工程學系暨碩士班] 期刊論文

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