In order to increase the energy density of supercapacitor, a new kind electrode material with excellent structure and outstanding electrochemical performance is highly desired. In this article, a new type of three-dimensional (3D) nitrogen-doped single-wall carbon nanotubes (SWNTs)/graphene elastic sponge (TRGN−CNTs−S) with low density of 0.8 mg cm −3 has been successfully prepared by pyrolyzing SWNTs and GO coated commercial polyurethane (PU) sponge. In addition, high performance electrode of the honeycomb-like NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S with core-shell structure has been successfully fabricated through hydrothermal method and then by annealing treatment and electrochemical deposition method, respectively. Benefited from 3D structural feature, the compressed NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S electrode exhibits high gravimetric and volumetric capacitance of 1810 F g −1 , 847.7 F cm −3 at 1 A g − 1 . The high rate performance and long-term stability was also obtained. Furthermore, an asymmetric supercapacitor using NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S cathode and NGN/CNTs anode delivered high gravimetric and volumetric energy density of 54 Wh kg −1 at 799.9 W kg −1 and 37 Wh L −1 at 561.5 W L −1 . In summary, an excellent electrochemical electrode with new elastic 3D SWNTs/graphene supports and binder free pseudocapacitive materials was introduced.

中文翻译：

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蜂窝状 NiCo 2 O 4 @Ni(OH) 2 支撑在 3D N−掺杂石墨烯/碳纳米管海绵上作为超级电容器的高性能电极

为了提高超级电容器的能量密度，迫切需要一种结构优良、电化学性能优异的新型电极材料。在本文中，通过以下方法成功制备了一种新型的三维（3D）氮掺杂单壁碳纳米管（SWNTs）/石墨烯弹性海绵（TRGN-CNTs-S），其密度为0.8 mg cm -3热解 SWNT 和 GO 涂层的商用聚氨酯（PU）海绵。此外，分别通过水热法、退火处理和电化学沉积法成功制备了具有核壳结构的蜂窝状NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S高性能电极。 . 受益于3D结构特征，压缩的 NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S 电极在 1 A g - 1 下表现出 1810 F g -1 和 847.7 F cm -3 的高重量和体积电容。还获得了高倍率性能和长期稳定性。此外，使用 NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S 阴极和 NGN/CNTs 阳极的非对称超级电容器在 799.9 W kg -1 和 37 Wh 时提供了 54 Wh kg -1 的高重量和体积能量密度L -1 在 561.5 WL -1 。总之，介绍了一种具有新型弹性 3D SWNT/石墨烯载体和无粘合剂赝电容材料的优异电化学电极。使用 NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S 阴极和 NGN/CNTs 阳极的非对称超级电容器在 799.9 W kg -1 和 37 Wh L - 下提供了 54 Wh kg -1 的高重量和体积能量密度1 在 561.5 WL -1 。总之，介绍了一种具有新型弹性 3D SWNT/石墨烯载体和无粘合剂赝电容材料的优异电化学电极。使用 NiCo 2 O 4 @Ni(OH) 2 /TRGN-CNTs-S 阴极和 NGN/CNTs 阳极的非对称超级电容器在 799.9 W kg -1 和 37 Wh L - 下提供了 54 Wh kg -1 的高重量和体积能量密度1 在 561.5 WL -1 。总之，介绍了一种具有新型弹性 3D SWNT/石墨烯载体和无粘合剂赝电容材料的优异电化学电极。