Effect of purification of carbon nanotubes on their electrocatalytic properties for oxygen reduction in acid solution
Effect of purification of carbon nanotubes on their electrocatalytic properties for oxygen reduction in acid solution
复制标题
DOI：
10.1016/j.carbon.2011.05.048
复制
发表时间：
2011-10
期刊：
影响因子：
10.9
通讯作者：
I. Kruusenberg;N. Alexeyeva;K. Tammeveski;J. Kozlova;L. Matisen;V. Sammelselg;J. Solla-Gullón;
中科院分区：
文献类型：
--
作者：
I. Kruusenberg;N. Alexeyeva;K. Tammeveski;J. Kozlova;L. Matisen;V. Sammelselg;J. Solla-Gullón;
采用旋转圆盘电极（RDE）法研究了酸处理单壁碳纳米管（SWCNT）和多壁碳纳米管（MWCNT）修饰玻碳（GC）电极在酸性介质中的氧还原反应.不同的酸用于碳纳米管（CNT）纯化。系统地研究了碳纳米管中的金属催化剂杂质对碳纳米管修饰电极上氧的电还原反应的影响。通过透射电子显微镜检查碳纳米管样品的表面形态，并通过能量色散X射线光谱法测定CNT材料中金属催化剂的浓度。酸处理的多壁碳纳米管的特征还在于通过拉曼和X-射线光电子能谱。在Nafion存在下制备了用于GC表面改性的SWCNTs和MWCNTs的水悬浮液。RDE的结果表明，酸处理的CNT修饰的GC电极是较低的活性催化剂比收到的碳纳米管，这可以解释的纯化的碳纳米管表面上的金属催化剂的情况下，氧还原。
The oxygen reduction reaction has been investigated on acid-treated single-walled (SWCNT) and multi-walled carbon nanotubes (MWCNT) modified glassy carbon (GC) electrodes in acid media using the rotating disk electrode (RDE) method. Different acids were used for the carbon nanotube (CNT) purification. A systematic study was carried out to elucidate whether the metal catalyst impurities of CNTs play a role in the electroreduction of oxygen on the CNT modified GC electrodes. The surface morphology of the carbon nanotube samples was examined by transmission electron microscopy and the concentration of metal catalysts in the CNT materials was determined by energy dispersive X-ray spectroscopy. The acid-treated MWCNTs were also characterised by Raman and X-ray photoelectron spectroscopies. Aqueous suspensions of SWCNTs and MWCNTs used for GC surface modification were prepared in the presence of Nafion. The RDE results indicated that the acid-treated CNT modified GC electrodes are less active catalysts for oxygen reduction than as-received CNTs which could be explained by the absence of metal catalysts on the surface of purified CNTs.