Synthesis of nitrogen-containing carbon materials for solid polymer fuel cell cathodes

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• 作者：Z. R. Ismagilov ; A. E. Shalagina ; O. Yu. Pod¡±yacheva ; Ch. N. Barnakov ; A. P. Kozlov ; R. I. Kvon ; I. Z. Ismagilov and M. A. Kerzhentsev
• 刊名：Kinetics and Catalysis
• 出版年：2007
• 出版时间：July, 2007
• 年：2007
• 卷：48
• 期：4
• 页码：581-588
• 全文大小：452 KB

文摘

The following nitrogen-containing supports with various nitrogen contents and structure and texture properties were synthesized: carbon nanofibers (N-CNFs) and amorphous microporous carbon materials (N-AMCMs). It was found that the above characteristics can be regulated by varying synthesis conditions: precursor compositions and reaction temperature and time. Mesoporous nitrogen-containing CNFs with a specific surface area of 30–350 m2/g and a pore volume of 0.10–0.83 cm3/g were formed by the catalytic decomposition of a mixture of ethylene with ammonia at 450–675¡ãC. Microporous materials (N-AMCMs) with a specific surface area of 472–3436 m2/g and a micropore volume of 0.22–1.88 cm3/g were prepared by the carbonization of nitrogen-containing organic compounds at 700–900¡ãC. An increase in the carbonization temperature and reaction time resulted in an increase in the specific surface area and microporosity of N-AMCMs, whereas lower temperatures of 450–550¡ãC and reaction times of 1–3 h were optimal for the preparation of N-CNFs with a developed texture. It was found that milder synthesis conditions and higher nitrogen contents of precursors were required for obtaining high nitrogen concentrations in both N-CNFs and N-AMCMs. The synthetic method developed allowed us to prepare carbon supports with nitrogen contents to 8 wt % .