Abstract
We demonstrate a rational template carbonization method to produce nitrogen-containing nanoporous carbons at 800 °C, using 1, 10-phenanthroline (or benzimidazole) as carbon/nitrogen source and magnesium citrate as template. The mass ratio of 1, 10-phenanthroline (or benzimidazole) and magnesium citrate has exerted the vital role in the determination of pore structures and the resulting electrochemical performances. It reveals that the carbon-P:Mg-1:1 (obtained by heating 1, 10-phenanthroline and magnesium citrate at 800 °C with the mass ratio of 1:1) and carbon-B:Mg-1:1 (obtained by heating benzimidazole and magnesium citrate at 800 °C with the mass ratio of 1:1) samples both are amorphous, nitrogen-containing, and highly nanoporous in nature. The carbon-P:Mg-1:1 sample has a large BET surface area of 1,657.4 m2 g−1 and high pore volume of 1.83 cm3 g−1, and those of carbon-B:Mg-1:1 sample are of 1,105.4 m2 g−1 and 1.67 cm3 g−1, respectively. Based on a three-electrode system using a 6-mol L−1 KOH aqueous solution as electrolyte, the carbon-P:Mg-1:1 and carbon-B:Mg-1:1 samples can deliver large specific capacitances of 289.0 and 255.6 F g−1 at a current density of 0.5 A g−1. They can also exhibit high energy densities of 40.1 and 35.5 Wh kg−1 when designated the power density as 0.25 kW kg−1 as well as highly long-term cycling durabilities.
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This work was financially supported by the National Natural Science Foundation of China (21101052), China Postdoctoral Science Foundation (20100480045), and the University Natural Science Research Project of Anhui Province (KJ2013B209).
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Zhang, Z.J., Qi, M.C., Chen, X.Y. et al. Nitrogen-containing nanoporous carbons by a rational template carbonization method evinced in the cases of 1, 10-phenanthroline and benzimidazole. J Solid State Electrochem 18, 1879–1887 (2014). https://doi.org/10.1007/s10008-014-2423-1
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DOI: https://doi.org/10.1007/s10008-014-2423-1