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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Mesoporous design of ultrathin NiO nanosheet-coated vertically aligned hexagonal CoS nanoplate core-shell array for flexible all-solid-state supercapacitors
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Mesoporous design of ultrathin NiO nanosheet-coated vertically aligned hexagonal CoS nanoplate core-shell array for flexible all-solid-state supercapacitors

机译：用于柔性固态超级电容器的超薄NIO纳米型垂直对准六方烯COL纳米层芯壳阵列的中孔设计

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Supercapacitors are becoming the next-generation high-power and carriable energy storage systems. However, large-scale manufacturing of supercapacitors is limited by their inferior energy storage densities, high costs, and rigidity; thus, a cost-effective binder-free approach is required to assemble advanced electrodes on flexible substrates. Multidimensional core-shell electrodes that are vertically aligned on an inexpensive conductive substrate can facilitate improved electrochemical performance. Herein, a core-shell heterostructure of hexagonal cobalt sulfide (CoS) nanoplates encased with ultrathin nickel oxide (NiO) nanosheets was fabricated on a flexible stainless-steel foil by simple chemical methods. Owing to the synergistic effect between the CoS nanoplates and ultrathin NiO nanosheets, the CoS-NiO core-shell electrode showed improved electrochemical performance with a specific capacitance of 1527 F g(-1) at a current density of 1 A g-1, high stability retaining 94% of the capacitance after 5000 charge-discharge cycles, and good capacitive retention during 30-fold enhancement in the current density. Finally, a flexible all-solid-state supercapacitor was fabricated using the CoS-NiO core-shell electrode and dip-coated carbon nanotubes as the positive and negative electrodes, respectively. The fabricated prototype exhibited a maximum energy density of 39 W h kg(-1), energy efficiency of 47%, and cycling stability retaining 89.5% of the capacitance after 5000 charge-discharge cycles. (C) 2020 Elsevier B.V. All rights reserved.
机译：超级电容器正在成为下一代大功率、可携带的储能系统。然而，超级电容器的大规模制造受到其低储能密度、高成本和刚性的限制；因此，需要一种经济高效的无粘结剂方法来在柔性基板上组装先进的电极。在廉价的导电基底上垂直排列的多维核壳电极有助于改善电化学性能。在此，通过简单的化学方法在柔性不锈钢箔上制备了包覆有超薄氧化镍（NiO）纳米片的六角硫化钴（CoS）纳米板的核壳异质结构。由于CoS纳米板和超薄NiO纳米片之间的协同效应，CoS-NiO核壳电极在电流密度为1 a g-1时的比电容为1527 F g（-1），在5000次充放电循环后保持了94%的高稳定性，在电流密度增加30倍的过程中，电容保持良好。最后，分别以CoS-NiO核壳电极和浸涂碳纳米管作为正极和负极，制备了柔性全固态超级电容器。该样机的最大能量密度为39 W h kg（-1），能量效率为47%，在5000次充放电循环后，循环稳定性保持89.5%的电容。（C） 2020爱思唯尔B.V.版权所有。

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