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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Surface Modification of CNTs with N-Doped Carbon: An Effective Way of Enhancing Their Performance in Supercapacitors
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Surface Modification of CNTs with N-Doped Carbon: An Effective Way of Enhancing Their Performance in Supercapacitors

机译：碳掺杂碳纳米管的表面改性：提高其在超级电容器中性能的有效途径

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摘要

Carbon nanotubes have been successfully coated with a N-doped carbon layer via hydrothermal carbonization in the presence of a nitrogencontaining carbohydrate, i.e., glucosamine hydrochloride. By controlling the amount of glucosamine added, it was possible to tune the N content of the composites N-doped carbon/CNT between 1.8-2.5 wt %. The prepared composites exhibited superior supercapacitor performance in comparison to bare CNTs even though they possess lower textural properties. Thus, a 2- to 4-fold increase in specific capacitance per surface area was registered at low current densities and sweep rates and a 2-fold increase in energy density, while keeping the power density. Besides, the composites possess superb long-term stability, losing only 4-6% of specific capacitance after 10,000 cycles at 10 A g~(-1).
机译：碳纳米管已经在含氮碳水化合物，即氨基葡萄糖盐酸盐的存在下，通过水热碳化成功地被掺有N的碳层所覆盖。通过控制氨基葡萄糖的添加量，可以将N掺杂的碳/ CNT复合材料的N含量调整为1.8〜2.5重量％。与裸露的CNT相比，制备的复合材料表现出优异的超级电容器性能，即使它们具有较低的质构特性。因此，在保持功率密度的同时，在低电流密度和扫描速率下，单位表面积的比电容增加了2到4倍，能量密度增加了2倍。此外，该复合材料具有极好的长期稳定性，在10 A g〜（-1）10,000次循环后，其比电容仅损失4-6％。

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