享受生活、科研和教书育人的乐趣分享 http://blog.sciencenet.cn/u/刘金平 研究方向:纳米能源材料及相关基础科学问题

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氧化钴/导电聚合物纳米线阵列用于水相非对称超级电容器

已有 9669 次阅读 2013-4-27 20:43 |个人分类:个人论文|系统分类:论文交流|关键词:学者| 聚合物, 超级电容器

在先前纳米线阵列超级电容器电极材料的研究基础上,本论文以氧化钴为例,将导电聚合物PPy材料成功复合在氧化钴纳米线阵列上,将有序阵列储能动力学上的优势和PPy的高导电性结合,获得了高的比容量;进一步通过两电极超级电容器的组装,充分展现了有序复合纳米线阵列在未来能量存储器件上的应用前景。欢迎各位同行批评指正。

Construction of High-Capacitance 3D CoO@Polypyrrole Nanowire Array Electrode for Aqueous Asymmetric Supercapacitor

Cheng Zhou, Yangwei Zhang, Yuanyuan Li, and Jinping Liu

Nano Lett., Article ASAP
DOI: 10.1021/nl400378j

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 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 (43.5 Wh kg–1), high power density (5500 W kg–1 at 11.8 Wh kg–1) and outstanding cycleability (20 000 times). After charging for only 10 s, two such 4 cm2 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.



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