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NiO/NixCo3?xO4 porous ultrathin nanosheetanowire composite structures as high-performance supercapacitor electrodes

机译:NiO / NixCo3?xO4多孔超薄纳米片/纳米线复合结构作为高性能超级电容器电极

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The demand for a new generation of high-safety, long-lifespan, and high-capacity power sources increases rapidly with the growth of energy consumption in the world. Here we report a facile method for preparing architecture materials made of NiO/Ni _( x ) Co _(3? x ) O _(4) porous nanosheets coupled with NiO/Ni _( x ) Co _(3? x ) O _(4) porous nanowires grown in situ on nickel foams using a hydrothermal method without any binder followed by a heat treatment process. The nanosheet-shaped NiO/Ni _( x ) Co _(3? x ) O _(4) species in the nanosheet matrix function well as a scaffold and support for the dispersion of the Ni _( x ) Co _(3? x ) O _(4) nanowires, resulting in a relatively loose and open structure within the electrode matrix. Among all composite electrodes prepared, the one annealed in air at 300 °C displays the best electrochemical behavior, achieving a specific capacitance of 270 mF cm ~(?2) at 5 mA cm ~(?2) while maintaining excellent stability (retaining ≈ 89% of the max capacitance after 20?000 cycles), demonstrating its potential for practical application in power storage devices.
机译:随着世界能源消耗的增长,对新一代高安全性,长寿命和高容量电源的需求迅速增长。在这里,我们报告了一种简便的方法来制备由NiO / Ni _(x)Co _(3?x)O _(4)多孔纳米片与NiO / Ni _(x)Co _(3?x)O耦合制成的建筑材料(4)使用无任何粘合剂的水热方法在镍泡沫上原位生长的多孔纳米线,然后进行热处理工艺。纳米片基质中的纳米片状NiO / Ni _(x)Co _(3?x)O _(4)物种起支架的作用并支持Ni _(x)Co _(3? x)O _(4)纳米线,导致电极矩阵内的结构相对疏松和开放。在所有准备的复合电极中,在300°C的空气中退火的复合电极表现出最佳的电化学行为,在5 mA cm〜(?2)的条件下达到270 mF cm〜(?2)的比电容,同时保持出色的稳定性( 20 000次循环后,最大电容的89%)证明了其在电力存储设备中的实际应用潜力。

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