Ni3S2 nanorods and three-dimensional reduced graphene oxide electrodes-based high-performance all-solid-state flexible asymmetric supercapacitors
Ni3S2 nanorods and three-dimensional reduced graphene oxide electrodes-based high-performance all-solid-state flexible asymmetric supercapacitors
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DOI：
10.1016/j.apsusc.2018.07.148
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发表时间：
2018-11
影响因子：
6.7
通讯作者：
Cheng Zhang;Sihao Wang;Shaolong Tang;Shuangbao Wang;Yuliang Li;Youwei Du
中科院分区：
文献类型：
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作者：
Cheng Zhang;Sihao Wang;Shaolong Tang;Shuangbao Wang;Yuliang Li;Youwei Du
探索高效的全固态柔性超级电容器对于面对快速增长的柔性和可穿戴储能设备的电源需求特别有吸引力。在此，我们提出了一种新的策略来制备高性能的全固态柔性非对称超级电容器，该策略基于纳米结构的Ni 3S 2纳米棒作为正极，三维还原氧化石墨烯（3DrGO）作为负极。由于铁尖晶石相Ni 3S 2和互连多孔3DrGO的可调形态结构和新颖的电子性质，合成的电极材料具有高的比电容、优异的倍率性能和循环稳定性。此外，结合电容性和法拉第能量存储机制，所构造的非对称超级电容器可以在单独的操作电压下互补地工作，从而导致显著增强的能量和功率密度。值得注意的是，优化的器件能够在0-2.2 V的电压范围内可逆地循环，但仍然提供高能量密度（70.58 W h kg−1）、高功率密度（33.0 kW kg− 1，52.44 W h kg−1）和优异的循环稳定性（即使在5000次循环后仍保持90.4%的比电容）。此外，该器件表现出良好的柔性而没有性能退化。值得注意的是，这项工作中电容和法拉第储能机制相结合的概念无疑为探索高性能储能系统提供了新的视角。
Exploring efficient all-solid-state flexible supercapacitors is particularly attractive to face the rapid growing demand of powers for flexible and wearable energy storage devices. Herein, we report a novel strategy to prepare high-performance all-solid-state flexible asymmetric supercapacitors based on nanostructured Ni3S2nanorods as positive electrode and three-dimensional reduced graphene oxide (3DrGO) as negative electrode. Due to the tunable morphological structures and novel electronic properties of heazlewoodite phase Ni3S2and interconnected porous 3DrGO, the synthesized electrode materials exhibit high specific capacitances, excellent rate performance and cycling stability. Furthermore, combining capacitive and faradaic energy storage mechanisms, the constructed asymmetric supercapacitor can work complementarily in separate operating voltage, thus leading to substantially enhanced energy and power densities. Remarkably, the optimized device is able to be cycled reversibly in the voltage range of 0–2.2 V, but still delivers high energy density (70.58 W h kg−1), high power density (33.0 kW kg−1at 52.44 W h kg−1), and excellent cycling stability (with 90.4% specific capacitance retained even after 5000 cycles). Moreover, the device exhibits good flexibility without performance degradation. Significantly, the conception of the combining capacitive and faradaic energy storage mechanisms in this work undoubtedly enables new perspective in exploring high-performance energy storage systems.