N-Doped carbon layer–coated carbon nanotube (N-C/CNT) nanocomposites with stable core-shell structures were synthesized using a one-pot hydrothermal reaction. After high-temperature carbonization and KOH activation, the resultant N-C/CNT materials used as supercapacitor electrodes show high specific capacitance, good rate capability, and long cycle stability. The specific capacitance exhibits a high value of 322.1 F g⁻¹ at 1 A g⁻¹, and still maintains 200.7 F g⁻¹, 168.7 F g⁻¹, and 120.0 F g⁻¹ at 5 A g⁻¹, 10 A g⁻¹, and 20 A g⁻¹, respectively. During the 10,000-cycle testing at 5 A g⁻¹, the specific capacitance was kept stable. The high performance of the supercapacitor electrodes could be attributed to the synergistic effect of the high specific surface area with fine pore structure, high electronic conductivity, and mechanical strength of CNT support and pseudocapacitance provided by doping N atoms in the carbon layer.

使用一锅水热反应合成了具有稳定核-壳结构的N掺杂碳层涂覆的碳纳米管（NC / CNT）纳米复合材料。经过高温碳化和KOH活化后，所得的用作超级电容器电极的NC / CNT材料显示出高的比电容，良好的倍率性能和长循环稳定性。比电容呈现出322.1 F G高值^-1 1个A G ^-1，和仍保持200.7 F G ^-1，168.7 F G ^-1，和120.0 F G ^-1在5 A G ^-1，10甲g ^-1和20 A g ^-1。在5 A g ^-1下进行10,000次循环测试期间，比电容保持稳定。超级电容器电极的高性能可归因于具有细孔结构的高比表面积，高电子电导率和CNT载体的机械强度以及通过在碳层中掺杂N原子而提供的伪电容的协同效应。