Multi-walled carbon nanotube modified with methylene blue under ultraviolet irradiation as a platinum catalyst support for methanol oxidation

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• 作者：Guotao Yang ; Xikun Yang ; Mingli Xu ; Chungang Min ; Haifeng Xiao ; Kezhu Jiang ; Linyan Chen ; Guanghua Wang
• 关键词：Electrocatalyst ; Multi-walled carbon nanotube ; Methylene blue ; Methanol oxidation ; Ultraviolet irradiation
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：222
• 期：Complete
• 页码：340-343
• 全文大小：674 K

文摘

To improve the utilization and activity of anodic catalysts for direct methanol fuel cells, multi-walled carbon nanotube (MWCNT) is used as a support for platinum (Pt) nanoparticles synthesized by method of ultraviolet irradiation. MWCNT is modified by methylene blue (f₀-MWCNT) under ultraviolet light (f₁-MWCNT), and then Pt nanoparticles are assembled on the f₁-MWCNT to form composites (Pt/f₁-MWCNT). Fourier transform infrared spectroscopy analysis reveals that the surface of MWCNT is successfully functionalized. Transmission electron microscopy and X-ray diffraction analyses exhibit that the uniformly dispersed Pt nanoparticles of around 2.5?nm in size are obtained. Cyclic voltammetric and chronoamperometric experiments demonstrate that the as-prepared Pt/f₁-MWCNT composites show higher catalytic activity and better stability compared with Pt/f₀-MWCNT and commercial Pt/C (JM), which is vital to anode electrocatalysis in direct methanol fuel cells.