Large-scale Synthesis of Nitrogen-doped Carbon Nanotubes by Chemical Vapor Deposition Using a Co-based Catalyst from Layered Double Hydroxides

Abstract

A catalyst with active Co particles was obtained by the calcination of Co/Al layered double hydroxides. With this catalyst, large-scale nitrogen-doped carbon nanotubes (N-doped CNTs) were synthesized by chemical vapor deposition at 850°C under a mixture of methane and acetonitrile. CNTs with different nitrogen contents were prepared by changing the flow rates of methane and acetonitrile. SEM, TEM and Raman spectroscopy were used to investigate the structure of the prepared N-doped CNTs. XPS was used to determine the nature of the chemical bonds of nitrogen in N-doped CNTs. The results show that the prepared N-doped CNTs have a uniform structure and a large amount of N doping.

One-dimensional nitrogen-containing carbon nanostructures

“…Successful preparation of SWNCNTs by using the arc-discharge technique was also reported by Holzinger et al [40]. Laser ablation technique, known to be used for the fabrication of CNTs, was also rarely utilized in the production of NCNTs, e.g., vaporization of a C:Ni/Y The synthesis of NCNTs was frequently accomplished through the pyrolysis of acetonitrile (CH 3 CN) (Table 1) and its mixtures with various organic compounds (hydrocarbons, alcohols, and ethers) [48,53,54,78,79,89,[112][113][114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130] (Table 2 Tables 1 and 2). Mixtures of SWNCNTs, defective MWNCNTs, and bamboo-like NCNTs were grown by CVD varying the feedstock composition of CH 3 CN/ethanol mixtures and using ferric ammonium citrate/Al 2 O 3 /MgO as catalyst precursor [124].…”

Hierarchical Nanocomposites Derived from Nanocarbons and Layered Double Hydroxides ‐ Properties, Synthesis, and Applications

“…The N content and proportion of graphitic‐like N structures increased with the increasing content of Ni in the LDH precursors. Large scale production of NCNTs with CoAl LDH catalyst by CVD at 850 °C under a mixture of methane and acetonitrile was reported 92. CNTs with different N content were prepared by changing flow rates of methane and acetonitrile.…”

Examination of the electroactive composites containing cobalt nanoclusters and nitrogen-doped nanostructured carbon as electrocatalysts for oxygen reduction reaction

“…The introduction of pentagons into the basal planes disrupts the planar hexagonal arrangement of carbon atoms found in graphite, causes buckling of the graphene layers, and results in interlayer distances that fluctuate between wider and thinner distances than found in pristine graphite [23]. Therefore N-doping may be responsible for the roughness of walls [26].…”