Nano Archive

Metal-free and electrocatalytically active nitrogen-doped carbon nanotubes synthesized by coating with polyaniline

Jin, Chen and Nagaiah, Tharamani Chikka and Xia, Wei and Spliethoff, Bernd and Wang, Shanshan and Bron, Michael and Schuhmann, Wolfgang and Muhler, Martin (2010) Metal-free and electrocatalytically active nitrogen-doped carbon nanotubes synthesized by coating with polyaniline. nanoscale .

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Abstract

Nitrogen doping of multi-walled carbon nanotubes (CNTs) was achieved by the carbonization of a polyaniline (PANI) coating. First, the CNTs were partially oxidized with KMnO4 to obtain oxygen-containing functional groups. Depending on the KMnO4 loading, thin layers of birnessite-type MnO2 (10 wt% and 30 wt%) were obtained by subsequent thermal decomposition. CNT-supported MnO2 was then used for the oxidative polymerization of aniline in acidic solution, and the resulting PANI-coated CNTs were finally heated at 550 °C and 850 °C in inert gas. The samples were characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. A thin layer of carbonized PANI was observed on the CNT surface, and the surface nitrogen concentration of samples prepared from 30% MnO2 was found to amount to 7.6 at% and 3.8 at% after carbonization at 550 °C and 850 °C, respectively. These CNTs with nitrogen-containing shell were further studied by electrochemical impedance spectroscopy and used as catalysts for the oxygen reduction reaction. The sample synthesized from 30 wt% MnO2 followed by carbonization at 850 °C showed the best electrochemical performance indicating efficient nitrogen doping.

Item Type:Article
Subjects:Material Science > Nanochemistry
ID Code:9332
Deposited By:CSMNT
Deposited On:02 Jun 2010 18:25
Last Modified:02 Jun 2010 18:25

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