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Preparation, Characterization and Application of Multi-walled CNTs by means of Phthalocyanine Pyrolysis
Guo Yanchuan,Xie Wenwei,Chen Lijuan,Peng Bixian*
Author NameAffiliationE-mail
Guo Yanchuan Technical Institute of Physics and ChemistryChinese Academy of ScienceBeijing 100101  
Xie Wenwei The University of Science and Technology of China Department of ChemistryHefei 230026  
Chen Lijuan Technical Institute of Physics and ChemistryChinese Academy of ScienceBeijing 100101  
Peng Bixian* Technical Institute of Physics and ChemistryChinese Academy of ScienceBeijing 100101 penbx@ipc.ac.cn 
Abstract:
In order to investigate the catalytic activity of high temperature treated CoPc toward oxygen reduction, and find the active site of the catalyst, using cobalt (Ⅱ) phthalocyanine (CoPc) as raw material, through thermal chemical vapor deposition method at 850℃ under a current of Ar/H2, two layer well-aligned multiwalled carbon nanotubes (CNTs) were made. The diameters of the well-aligned carbon nanotubes were distributed in the range of 60~120 nm and the length was about 40 μm. The Co particle with 10 nm in diameter was encapsulated in the CNTs compartment. The products were observed by field emission scanning electron microscope (SEM), and transmission electron microscope (TEM). The well-aligned carbon nanotubes were characteriszed by Raman scattering spectrum and X-ray diffraction (XRD). The cyclic voltammetric measurement demonstrates that the CNTs have some effect to prevent the metal nanoparticle encapsulated from eroding rapidly. It is assumed that the small amount of the N element in the CNTs is very necessary for the bamboo-like morphology and the protected action for metal particles against dissolution in the acid medium. The radian of the winding wall should be affected by the amount of the N and the interaction between the N in the carbon network and the metal cluster. In addition, the CNTs greater electrochemically active surface area is a great advantage for any electrocatalytic application.
Key words:  Carbon nanotubes, Chemical vapor deposition, Scanning electron microscope (SEM)
FundProject:
酞菁裂解法多壁碳纳米管的制备、表征和应用
郭燕川,谢文委,陈丽娟,彭必先*
摘要:
为了探究高温处理酞菁钴对O2的催化还原作用,以酞菁钴作为催化剂的前体,通过化学气相沉积的方法,在850℃下,氩气与氢气混合气流中,制备了双层定向碳纳米管,纳米管的直径分布在60~120 nm,长度约为40 μm,在纳米碳管中包裹有直径为10 nm的钴颗粒.所得产品用透射电子显微镜和扫描电子显微镜进行了观察,并用拉曼谱和X射线衍射对样品进行了表征.通过循环伏安法测量得到纳米碳管对金属颗粒在酸性溶液中的腐蚀具有一定抵抗作用.认为少量的N对于竹节状碳纳米管的形成和金属对酸的抵抗作用是十分必要的,每节中碳壁的弯曲弧度则与N在碳纳米管中含量和N与金属的相互作用有关.另外,碳纳米管较大的电化学活性区域在电化学方面具有潜在的应用价值.
关键词:  纳米碳管  化学蒸气沉积  扫描电镜
DOI:10.1088/1674-0068/17/6/767-774
分类号: