Symmetrical MnO2-Carbon Nanotube-Textile Nanostructures for Wearable Pseudocapacitors with High Mass Loading
Symmetrical MnO2-Carbon Nanotube-Textile Nanostructures for Wearable Pseudocapacitors with High Mass Loading
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DOI：
10.1021/nn203085j
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发表时间：
2011-11-01
期刊：
影响因子：
17.1
通讯作者：
Cui, Yi
中科院分区：
文献类型：
--
作者：
Hu, Liangbing;Chen, Wei;Cui, Yi
虽然MnO 2由于其高比容量和低成本而成为用于伪电容器应用的有前景的材料，但MnO 2电极具有低的电导率和离子电导率。在这篇文章中，我们报告了一种结构，其中二氧化锰纳米花共形电沉积到碳纳米管（CNT）启用导电纺织纤维。这种纳米结构有效地降低了电极中的离子扩散和电荷传输电阻。对于一个给定的面积质量负载，导电纺织纤维上的MnO 2的厚度是远远小于在一个平坦的金属基板上。这种多孔结构还允许高达8.3 mg/cm（2）的大质量负载，这导致在0.05 mV/s的扫描速率下2.8 F/cm（2）的高面积电容。展示了全电池，其中MnO 2-CNT-织物用作正极，还原的MnO 2-CNT-织物用作负极，并且在水中的0.5M Na 2SO 4作为电解质。由此产生的伪电容器显示出有前途的结果，作为一种低成本的能量存储解决方案和有吸引力的可穿戴电源。
While MnO2 is a promising material for pseudocapacitor applications due to its high specific capacity and low cost, MnO2 electrodes suffer from their low electrical and ionic conductivities. In this article, we report a structure where MnO2 nanoflowers were conformally electrodeposited onto carbon nanotube (CNT)-enabled conductive textile fibers. Such nanostructures effectively decrease the ion diffusion and charge transport resistance in the electrode. For a given areal mass loading, the thickness of MnO2 on conductive textile fibers is much smaller than that on a flat metal substrate. Such a porous structure also allows a large mass loading, up to 8.3 mg/cm(2), which leads to a high areal capacitance of 2.8 F/cm(2) at a scan rate of 0.05 mV/s. Full cells were demonstrated, where the MnO2-CNT-textile was used as a positive electrode, reduced MnO2-CNT-textile as a negative electrode, and 0.5 M Na2SO4 in water as the electrolyte. The resulting pseudocapacitor shows promising results as a low-cost energy storage solution and an attractive wearable power.