The lightweight carbon nanotube (CNT) has been attracting great attention in the field of flexible electronics, but it is still a challenge to increase both high capacitance and high energy density. Here, we report the use of an epoxy-ended hyperbranched polymer (EHP) as a reactive template in an in situ preparation of porous NiCo₂O₄ on a pristine CNT film. The resultant porous NiCo₂O₄ has a core–shell nanostructure and possesses higher surface area and electrochemical performance in comparison to NiCo₂O₄ prepared without CNT film. As an electrode material, the CNT@NiCo₂O₄ film showed a high specific volume capacitance of 281.7 F cm^–3. The flexible symmetric supercapacitor assembled from the CNT@NiCo₂O₄ film displayed high volume capacitance (23.3 F cm^–3), 95.6% retention in capacitance after 5000 charging–discharging cycles and bending performance, and high energy density (3.2 mWh cm^–3). The CNT film served as a flexible current collector, and porous NiCo₂O₄ supplied high electrochemical performance. The reaction mechanism using the epoxy-ended hyperbranched polymer as a reactive template in the preparation of porous NiCo₂O₄ has been investigated using FT-IR, XRD, and TG.

中文翻译：

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使用超支化聚合物模板在碳纳米管薄膜上原位生长多孔NiCo ₂ O ₄制成的柔性超级电容器

轻质碳纳米管（CNT）在柔性电子领域引起了极大的关注，但是增加高电容和高能量密度仍然是一个挑战。在这里，我们报道了在原始CNT膜上原位制备多孔NiCo ₂ O _4时，使用环氧端基超支化聚合物（EHP）作为反应模板。与没有CNT膜制备的NiCo ₂ O ₄相比，所得的多孔NiCo ₂ O ₄具有核-壳纳米结构，并具有较高的表面积和电化学性能。CNT @ NiCo ₂ O ₄作为电极材料薄膜显示出281.7 F cm ^–3的高比容电容。由CNT @ NiCo ₂ O ₄薄膜组装而成的柔性对称超级电容器具有高容量电容（23.3 F cm ^–3），经过5000次充放电和弯曲性能后电容保持率达95.6％，并且能量密度高（3.2 mWh cm ^{– 3}）。CNT膜用作柔性集电器，并且多孔NiCo ₂ O ₄提供了高电化学性能。利用FT-IR，XRD和TG研究了以环氧端基超支化聚合物为反应模板制备多孔NiCo ₂ O ₄的反应机理。