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کلوئیدها و سطوح الف: جنبه های فیزیکوشیمیایی و مهندسی
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همایش ، رویداد ، ژورنال
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  • preparation of nitrogen-doped macro-/mesoporous carbon foams as electrode material for supercapacitors

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     an oil-in-water (o/w) emulsion system of span 80–tween 80/1iquid paraffin/aqueous resorcinol–formaldehyde was manufactured. nitrogen-doped macro-/mesoporous carbon foams (n-mmcfs) were prepared by the polymerization of this o/w emulsion, followed by carbonization and activation process. as-prepared n-mmcfs were characterized by scanning electron microscopy, infrared (ir) spectra, n2adsorption and desorption analysis, and electrochemical workstation. the results indicate that the n-mmcfs have main macropore of 0.2 μm, mesopore of 2.6–4.0 nm and specific surface areas of 1205–1808 m2 g−1. the contact angle of n-mmcfs for water is about 37.5°, obviously lower than that of mmcfs (72.9°), which suggests that the surface wettability of n-mmcfs is greatly improved due to the incorporation of nitrogen into the carbon framework. electrochemical measurements show that specific capacitance of a typical n-mmcf as electrode material in 6 m koh aqueous solution is as high as 198 f g−1 at a current density of 1.0 a g−1. its specific capacitance can still remain 159 f g−1 at a high loading current density of 20.0 a g−1 with the retention of 80.3%, which indicates that the typical n-mmcf as electrode material has a good rate capability. the high current charge and discharge capability offers the promising prospects for the application of n-mmcfs as electrode materials in supercapacitors which could meet the need of high power density.

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