材料科学
超级电容器
碳纳米管
电极
电容
纳米技术
阴极
阳极
功率密度
储能
锂(药物)
电流密度
比能量
电解质
化学工程
碳纤维
复合材料
电化学
复合数
电气工程
功率(物理)
物理化学
量子力学
内分泌学
物理
医学
工程类
化学
作者
Zhe Tang,Chunhua Tang,Hao Gong
标识
DOI:10.1002/adfm.201102796
摘要
Abstract The demand for advanced energy storage devices such as supercapacitors and lithium‐ion batteries has been increasing to meet the application requirements of hybrid vehicles and renewable energy systems. A major limitation of state‐of‐art supercapacitors lies in their relatively low energy density compared with lithium batteries although they have superior power density and cycle life. Here, we report an additive‐free, nano‐architectured nickel hydroxide/carbon nanotube (Ni(OH) 2 /CNT) electrode for high energy density supercapacitors prepared by a facile two‐step fabrication method. This Ni(OH) 2 /CNT electrode consists of a thick layer of conformable Ni(OH) 2 nano‐flakes on CNT bundles directly grown on Ni foams (NFs) with a very high areal mass loading of 4.85 mg cm −2 for Ni(OH) 2 . Our Ni(OH) 2 /CNT/NF electrode demonstrates the highest specific capacitance of 3300 F g −1 and highest areal capacitance of 16 F cm −2 , to the best of our knowledge. An asymmetric supercapacitor using the Ni(OH) 2 /CNT/NF electrode as the anode assembled with an activated carbon (AC) cathode can achieve a high cell voltage of 1.8 V and an energy density up to 50.6 Wh/kg, over 10 times higher than that of traditional electrochemical double‐layer capacitors (EDLCs).
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