RESEARCH ARTICLE

 

Synthesis of nitrogen-doped carbon nanotubes with layered double hydroxides containing iron, cobalt or nickel as catalyst precursors

 

 

Yong Cao^{I, II}; Qingze Jiao^II; Yun Zhao^{II, *}; Gangfu Song^I; Peiyong Zhang^I

^IInstitute of Environment and Municipal Engineering, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, People's Republic of China
^IISchool of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, People's Republic of China

 

 

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ABSTRACT

Nitrogen-doped carbon nanotubes (CN_x) were synthesized by the catalytic chemical vapour deposition of ethylenediamine with layered double hydroxides (LDHs) containing iron, cobalt or nickel as catalyst precursors at 650 °C. The catalytically active metal particles were obtained by calcination of LDHs followed by reduction. X-ray diffraction was used to characterize the structures of the precursors and their calcined products. Transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy were used to characterize the grown CN_x. The results show that the CN_x grown with Mg₂ Fe-LDH as catalyst precursor have abamboo-like morphology and large diameter, while hollow tubes are obtained with CoMgAl- and NiMgAl-LDH as catalyst precursors. The CN_x grown with CoMgAl-LDH have the highest N-doped content and the CN_x grown with NiMgAl-LDH have the highest degree of graphitization among these three products.

Keywords: N-doped carbon nanotubes, layered double hydroxides, chemical vapour deposition

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Acknowledgements

This work was conducted with financial support from the Chinese National '863' (No. 2006AA03Z570) fund and Excellent Young Scholars Research Fund of Beijing Institute of Technology (No. c2007YS0404).

 

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Received 31 March 2009
Revised 13 April 2010
Accepted 7 May 2010

 

 

* To whom correspondence should be addressed. E-mail: zhaoyun@bit.edu.cn