Construction of High-Capacitance 3D CoO@Polypyrrole Nanowire Array Electrode for Aqueous Asymmetric Supercapacitor
Construction of High-Capacitance 3D CoO@Polypyrrole Nanowire Array Electrode for Aqueous Asymmetric Supercapacitor
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用于水性不对称超级电容器的高电容3D CoO@聚吡咯纳米线阵列电极的构建
DOI：
10.1021/nl400378j
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发表时间：
2013-05-01
期刊：
影响因子：
10.8
通讯作者：
Liu, Jinping
中科院分区：
文献类型：
--
作者：
Zhou, Cheng;Zhang, Yangwei;Liu, Jinping
我们开发了一种超级电容器电极，该电极由生长在3D镍泡沫上的良好排列的CoO纳米线阵列组成，聚吡咯（PPy）均匀地固定在每个纳米线表面上或牢固地锚定到每个纳米线表面上以提高赝电容性能。该电极结构利用了CoO和PPy的高电化学活性、PPy的高电子电导率以及有序介孔纳米线中的短离子扩散路径。这些优点与CoO和PPy之间的出色协同作用一起导致接近理论值的2223 F g（-1）的高比电容、良好的倍率性能和循环稳定性（2000次循环后99.8%的电容保持率）。采用该混合阵列作为正极，活性炭膜作为负极，制备了最大电压为1.8V的水溶液非对称超级电容器（，类似于43.5 Wh kg（-1））、高功率密度（类似于11.8 Wh kg（-1）时的5500 W kg（-1））和出色的循环能力（类似于20000次）。在仅充电近似40秒之后，两个串联连接的这样的4cm（2）非对称超级电容器可以有效地为5 mm直径的红色、黄色和绿色圆形LED指示器供电（对于红色LED持续1小时），并且稳健地驱动迷你130旋转电机。
We have developed a supercapacitor electrode composed of well-aligned CoO nanowire array grown on 3D nickel foam with polypyrrole (PPy) uniformly immobilized onto or firmly anchored to each nanowire surface to boost the pseudocapacitive performance. The electrode architecture takes advantage of the high electrochemical activity from both the CoO and PPy, the high electronic conductivity of PPy, and the short ion diffusion pathway in ordered mesoporous nanowires. These merits together with the elegant synergy between CoO and PPy lead to a high specific capacitance of 2223 F g(-1) approaching the theoretical value, good rate capability, and cycling stability (99.8% capacitance retention after 2000 cycles). An aqueous asymmetric supercapacitor device with a maximum voltage of 1.8 V fabricated by using our hybrid array as the positive electrode and activated carbon film as the negative electrode has demonstrated high energy density (,similar to 43.5 Wh kg(-1)), high power density (similar to 5500 W kg(-1) at 11.8 Wh kg(-1)) and outstanding cycleability (similar to 20 000 times). After charging for only similar to 40 s, two such 4 cm(2) asymmetric supercapacitors connected in series can efficiently power 5 mm diameter red, yellow, and green round LED indicators (lasting for 1 h for red LED) and drive a mini 130 rotation-motor robustly.