Abstract Binder-free electrodes provide great opportunities for the development of high-performance energy devices due to the absence of insulating and inactive binders. In this paper, NiCo2S4 arrays with attractive nanostructures were directly grown on activated carbon textile (ACT) by a facile one-pot hydrothermal method to develop a self-supported binder-free electrode. The nanostructures can be tuned from nanorods to nanosheets by simply controlling the concentration of the sulfur source. Both arrays exhibited battery-type behavior of the positive electrode, where the nanosheets arrays with relatively higher capacity of 183.2 mA h g−1 at 2 mA cm-2 and better cycling stability of 82.6 % capacitance retention after 1000 cycles was employed in an asymmetric supercapacitor (ASC) as positive electrode. The ASC exhibited excellent rate capability with the maximum specific energy of 56.2 Wh/kg and the specific power of 632.7 W/kg at the current density of 4 mA/cm2. The presented results are believed to be helpful to the design and application of promising flexible binder-free electrode for high-performance hybrid supercapacitors.

中文翻译：

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在活性炭织物上轻松合成形态可控的 NiCo2S4 阵列作为高性能无粘合剂超级电容器电极

摘要 由于没有绝缘和非活性粘合剂，无粘合剂电极为高性能能源设备的发展提供了巨大的机会。在本文中，具有有吸引力的纳米结构的 NiCo2S4 阵列通过简便的一锅水热法直接生长在活性炭织物 (ACT) 上，以开发自支撑无粘合剂电极。通过简单地控制硫源的浓度，可以将纳米结构从纳米棒调整为纳米片。两种阵列均表现出正极的电池型行为，其中纳米片阵列在 2 mA cm-2 时具有相对较高的 183.2 mA hg-1 容量和更好的循环稳定性，1000 次循环后电容保持率为 82.6%，用于非对称超级电容器(ASC) 作为正极。ASC 在 4 mA/cm2 的电流密度下表现出优异的倍率性能，最大比能量为 56.2 Wh/kg，比功率为 632.7 W/kg。所呈现的结果被认为有助于用于高性能混合超级电容器的有前途的柔性无粘合剂电极的设计和应用。