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CNx Nanofibers Converted From Polypyrrole Nanowires As Platinum Support For Methanol Oxidation

Y. Ma, Shujuan Jiang, G. Jian, Hai-sheng Tao, Leshu Yu, Xuebin Wang, Xizhang Wang, J. Zhu, Zheng Hu, Yi Chen
Published 2009 · Materials Science

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A new kind of carbon nitride (CNx) nanofiber has been prepared by the calcination of polypyrrole nanowires at 800 °C. The product maintained a wire-like morphology during calcination, and the pyrrolic nitrogen in the polypyrrole nanowires gradually changed to pyridinic and graphitic nitrogen as annealing temperature increased. These CNx nanofibers, prepared at 800 °C, have a nitrogen concentration of about 10%. Pt nanoparticles with average size of ∼3 nm could therefore be easily immobilized onto the CNx nanofibers because of the inherent chemical activity arising from the nitrogen incorporation. The Pt/CNx composite catalyst thus obtained has a large electrochemically active area and gives good electrocatalytic performance for methanol oxidation, both in activity and stability, suggesting it has potential application in fuel cells.
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