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.
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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
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This work was supported by the National Natural Science Foundation of China (no. 20676027).
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Lv, WX., Zhang, R., Xia, TL. et al. Influence of NH3 flow rate on pyridine-like N content and NO electrocatalytic oxidation of N-doped multiwalled carbon nanotubes. J Nanopart Res 13, 2351–2360 (2011). https://doi.org/10.1007/s11051-010-9994-2
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DOI: https://doi.org/10.1007/s11051-010-9994-2