Hierarchical Ni@Ni(OH)2 core-shell hybrid arrays on cotton cloth fabricated by a top-down approach for high-performance flexible asymmetric supercapacitors
Hierarchical Ni@Ni(OH)2 core-shell hybrid arrays on cotton cloth fabricated by a top-down approach for high-performance flexible asymmetric supercapacitors
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DOI：
10.1016/j.jallcom.2019.01.027
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发表时间：
2019-05
影响因子：
6.2
通讯作者：
Zhihang Jin;Man Zhou;Jinguang Hu;Kai Li;Liping Tang;Hong Zhao;Z. Cai;Yaping Zhao
中科院分区：
文献类型：
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作者：
Zhihang Jin;Man Zhou;Jinguang Hu;Kai Li;Liping Tang;Hong Zhao;Z. Cai;Yaping Zhao
采用简单且经济高效的自上而下策略，通过无钯催化化学沉积工艺，然后进行电化学氧化，进一步优化循环伏安法循环时间，在棉柔性电极上制备高导电镍微球@Ni(OH)2纳米片核壳(Ni@N NF-CT)。利用界面Ni微球和Ni(OH)2纳米片的优点，通过增加电活性表面和缩短离子扩散距离加速电子传输，所制备的电极表现出优异的电化学性能，例如超高面积比电容（在电流密度为5.17Fcm−2/0.53mAh cm−2） 5mAcm−2）、高倍率性能（25mAcm−2 电流密度下电容保持率为 78%）和良好的循环稳定性（1500 个充电/放电循环后电容保持率为 89.5%）。以棉花上的Ni @ Ni(OH)2核壳为正极，活性炭布(ACC)为负极，成功制备了柔性非对称超级电容器(FASC)，其在功率密度为3.68mWcm−2(5mAcm−2)时表现出0.597mWh cm−2(1.91Fcm−2/1.44mAh cm−2)的高能量密度。 在 2.0M KOH 水性电解质中。该器件还非常灵活，如在各种弯曲条件下为红色 LED 供电所证明的那样。这种简便的制造工艺证明了在棉花上低成本生产Ni@Ni(OH)2核壳材料是一种有前途的材料，可用于高性能柔性电化学储能装置。
A simple and cost-efficient top-down strategy is used to prepare a high conductive Ni microspheres @ Ni(OH)2nanoflakes core-shell on cotton (Ni@N NF-CT) flexible electrode via a palladium-free catalytic electroless deposition process followed by electrochemical oxidation with further optimized cyclic voltammetry cycle times. Taking the advantages of the interfacial Ni microspheres and Ni(OH)2nanoflakes which accelerates the electronic transport through the increased electro-active surface and the shortened ion diffusion distance, the as-prepared electrode exhibits the outstanding electrochemical performances such as ultrahigh areal specific capacitance (5.17 F cm−2/0.53 mAh cm−2at a current density of 5 mA cm−2), the high rate capability (78% capacitance retention at a current density of 25 mA cm−2) and the well cycling stability (89.5% capacitance retention after 1500 charge/discharge cycles). A flexible asymmetric supercapacitor (FASC) is successfully fabricated using Ni @ Ni(OH)2core-shell on cotton as the positive electrode and active carbon cloth (ACC) as the negative electrode, which manifests a high energy density of 0.597 mWh cm−2(1.91 F cm−2/1.44 mAh cm−2) at a power density of 3.68 mW cm−2(5 mA cm−2) in 2.0 M KOH aqueous electrolyte. The device is also super flexible as demonstrated by powering the red LEDs under various bending conditions. This facile fabrication process demonstrates the low-cost production of Ni @ Ni(OH)2core-shell on cotton as a promising material for application in the high-performance flexible electrochemical energy storage devices.