Nitrogen‐doped porous carbon nanotubes@MnO₂ (N‐CNTs@MnO₂) nanocomposites are prepared through the in situ growth of MnO₂ nanosheets on N‐CNTs derived from polypyrrole nanotubes (PNTs). Benefiting from the synergistic effects between N‐CNTs (high conductivity and N doping level) and MnO₂ nanosheets (high theoretical capacity), the as‐prepared N‐CNTs@MnO₂‐800 nanocomposites show a specific capacitance of 219 F g⁻¹ at a current density of 1.0 A g⁻¹, which is higher than that of pure MnO₂ nanosheets (128 F g⁻¹) and PNTs (42 F g⁻¹) in 0.5 m Na₂SO₄ solution. Meanwhile, the capacitance retention of 86.8 % (after 1000 cycles at 10 A g⁻¹) indicates an excellent electrochemical performance of N‐CNTs@MnO₂ prepared in this work.

中文翻译：

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在超级电容器用聚吡咯管衍生的N掺杂碳纳米管上原位生长MnO2纳米片。

氮掺杂多孔碳纳米管@MnO ₂（N- CNTs @ MnO ₂）纳米复合材料是通过在源自聚吡咯纳米管（PNT）的N-CNT上原位生长MnO ₂纳米片而制备的。由N-碳纳米管（高导电性和N掺杂水平）和MnO之间的协同效应中受益_2个纳米片（高理论容量），所制备的N-碳纳米管@的MnO ₂ -800纳米复合材料显示出219 F G的特定电容^-1在1.0 A g ^-1的电流密度下，高于0.5 m内纯MnO ₂纳米片（128 F g ^-1）和PNTs（42 F g ^-1） 的电流密度Na ₂ SO ₄溶液。同时，电容保持率为86.8％（在10 A g ^-1下经过1000次循环后）表明在这项工作中制备的N-CNTs @ MnO ₂具有出色的电化学性能。