Journal of Nanoparticle Research

, Volume 13, Issue 6, pp 2351–2360

Influence of NH3 flow rate on pyridine-like N content and NO electrocatalytic oxidation of N-doped multiwalled carbon nanotubes

  • Wei-Xin Lv
  • Rui Zhang
  • Ting-Liang Xia
  • Hong-Mei Bi
  • Ke-Ying Shi
Research Paper

DOI: 10.1007/s11051-010-9994-2

Cite this article as:
Lv, W., Zhang, R., Xia, T. et al. J Nanopart Res (2011) 13: 2351. doi:10.1007/s11051-010-9994-2

Abstract

Nitrogen-doped multiwalled carbon nanotubes (N-MWCNTs) have been prepared by pyrolysis of pyridine and iron phthalocyanine over an iron catalyst at 850 °C at various ammonia gas (NH3) flow rates. X-ray photoelectron spectroscopy results reveal that the pyridine-like nitrogen (N) content can be controlled by changing the flow rate of NH3, and that pyridine-like N plays an important role: it can increase the electrocatalytic activity and the rate of nitric oxide (NO) electrooxidation and decrease the activation energy of NO electrooxidation. Cyclic voltammetry results demonstrate that the N-MWCNTs sample grown with 200 mL/min NH3 flow has the maximum N content of 3.22 atomic %, and its content of pyridine-like N that is chemically active is also the highest among all the N-MWCNTs samples. Electrochemical impedance spectroscopy results indicate that two-step electron transfer process occurs at the N-MWCNT-modified electrode, and the control step is different in various potential regions. The stability of NO electrooxidation at the N-MWCNT-modified electrode is examined, and the reaction mechanism is discussed.

Keywords

Carbon nanotubesN-dopedPyridine-like NGraphite-like NNO electrooxidationSynthesis

Abbreviations

N-MWCNTs

N-doped multiwalled carbon nanotubes

CNTs

Carbon nanotubes

CV

Cyclic voltammetry

EIS

Electrochemical impedance spectroscopy

TEM

Transmission electron microscopy

XPS

X-ray photoelectron spectroscopy

GC

Glass carbon

SWCNTs

Single-walled carbon nanotubes

Supplementary material

11051_2010_9994_MOESM1_ESM.pdf (63 kb)
Supplementary material 1 (PDF 62 kb)

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Wei-Xin Lv
    • 1
    • 2
  • Rui Zhang
    • 1
    • 2
  • Ting-Liang Xia
    • 1
    • 2
  • Hong-Mei Bi
    • 1
    • 2
  • Ke-Ying Shi
    • 1
    • 2
  1. 1.Key Laboratory of Functional Inorganic Material Chemistry, Ministry of EducationHeilongjiang UniversityHarbinPeople’s Republic of China
  2. 2.Key Laboratory of Physical Chemistry, School of Chemistry and Materials ScienceHeilongjiang UniversityHarbinPeople’s Republic of China