Advanced asymmetric supercapacitors based on CNT@Ni(OH)(2) core-shell composites and 3D graphene networks
Advanced asymmetric supercapacitors based on CNT@Ni(OH)(2) core-shell composites and 3D graphene networks
复制标题
基于CNT@Ni(OH)(2)核壳复合材料和3D石墨烯网络的先进非对称超级电容器
DOI：
10.1039/c5ta06174a
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发表时间：
2015
影响因子：
11.9
通讯作者：
Wang Xuefeng
中科院分区：
文献类型：
--
作者：
Yi Huan;Wang Huanwen;Jing Yuting;Peng Tianquan;Wang Yiran;Guo Jiang;He Qingliang;Guo Zhanhu;Wang Xuefeng
据报道，在 KOH 水溶液中使用碳纳米管@氢氧化镍纳米片（CNT@Ni(OH)2）核壳复合材料作为正极，以三维（3D）石墨烯网络（3DGN）作为负极的不对称超级电容器（ASC）。 CNT@Ni(OH)2核壳复合材料是通过简便的化学浴沉积方法制备的，而3DGN是通过石墨烯水凝胶的冷冻干燥获得的。凭借其独特的微观结构，在三电极系统中实现了优异的电化学性能，例如，CNT@Ni(OH)2 电极在 0–0.5 V 范围内，在 2 A g−1 下具有 1136 F g−1，而 3DGN 电极在 -1–0 V 范围内，在 1 A g−1 下具有 203 F g−1。 CNT@Ni(OH)2//3DGN ASC 在功率密度为 800 W kg−1 时表现出 44.0 W h kg−1 的最大能量密度，甚至在 0–1.6 V 电压范围内以 16 000 W kg−1 保持 19.6 W h kg−1 。
Asymmetric supercapacitors (ASCs) with carbon nanotube@nickel hydroxide nanosheet (CNT@Ni(OH)2) core–shell composites as positive electrodes and three-dimensional (3D) graphene networks (3DGNs) as negative electrodes were reported in aqueous KOH electrolyte. The CNT@Ni(OH)2 core–shell composites were prepared through a facile chemical bath deposition method, while 3DGNs were obtained by freeze-drying of graphene hydrogels. By virtue of their unique microstructures, superb electrochemical properties were achieved in a three-electrode system, e.g., 1136 F g−1 at 2 A g−1 for the CNT@Ni(OH)2 electrode within 0–0.5 V and 203 F g−1 at 1 A g−1 for the 3DGN electrode within −1–0 V. Benefiting from these merits, the as-fabricated CNT@Ni(OH)2//3DGN ASC showed a maximum energy density of 44.0 W h kg−1 at a power density of 800 W kg−1 and even retained 19.6 W h kg−1 at 16 000 W kg−1 in the voltage region of 0–1.6 V.