Design and Synthesis of MnO2/Mn/MnO2 Sandwich-Structured Nanotube Arrays with High Supercapacitive Performance for Electrochemical Energy Storage
Design and Synthesis of MnO2/Mn/MnO2 Sandwich-Structured Nanotube Arrays with High Supercapacitive Performance for Electrochemical Energy Storage
复制标题
用于电化学储能的高超电容性能MnO2/Mn/MnO2三明治结构纳米管阵列的设计与合成
DOI：
10.1021/nl301748m
复制
发表时间：
2012-07-01
期刊：
影响因子：
10.8
通讯作者：
Tong, Ye-Xiang
中科院分区：
文献类型：
--
作者：
Li, Qi;Wang, Zi-Long;Tong, Ye-Xiang
我们展示了用于超级电容器的 MnO2/Mn/MnO2 三明治状纳米管阵列的新型纳米结构的设计和制造。 MnO2/Mn/MnO2 三明治状纳米管中的结晶金属锰层独特地充当高导电核，以支撑具有高度电解可及表面积的氧化还原活性双双 MnO2 壳，并为 MnO2 壳提供可靠的电连接。在 1.0 M Na2SO4 溶液中，MnO2/Mn/MnO2 三明治状纳米管阵列通过循环伏安法 (CV) 在 5 mV/s 扫描速率下获得了 937 F/g 的最大比电容，在 1.5 A/g 电流密度下通过计时电位法获得了 955 F/g 的最大比电容。混合MnO2/Mn/MnO2三明治状纳米管阵列表现出优异的倍率性能，比能量高达45 Wh/kg，比功率高达23 kW/kg，并且具有优异的长期循环稳定性（3000次循环后最大比电容损失小于5%）。这种 MnO2/Mn/MnO2 三明治状纳米管阵列提供的高比电容和充放电速率使其成为超级电容器电极的有希望的候选者，将高能量密度与高水平的功率传输结合起来。
We demonstrate the design and fabrication of novel nano-architectures of MnO2/Mn/MnO2 sandwich-like nanotube arrays for super-capacitors. The crystalline metal Mn layers in the MnO2/Mn/MnO2 sandwich-like nanotubes uniquely serve as highly conductive cores to support the redox active two-double MnO2 shells with a highly electrolytic accessible surface area and provide reliable electrical connections to MnO2 shells. The maximum specific capacitances of 937 F/g at a scan rate of 5 mV/s by cyclic voltammetry (CV) and 955 F/g at a current density of 1.5 A/g by chronopotentiometry were achieved for the MnO2/Mn/MnO2 sandwich-like nanotube arrays in solution of 1.0 M Na2SO4. The hybrid MnO2/Mn/MnO2 sandwich-like nanotube arrays exhibited an excellent rate capability with a high specific energy of 45 Wh/kg and specific power of 23 kW/kg and excellent long-term cycling stability (less 5% loss of the maximum specific capacitance after 3000 cycles). The high specific capacitance and charge-discharge rates offered by such MnO2/Mn/MnO2 sandwich-like nanotube arrays make them promising candidates for supercapacitor electrodes, combining high-energy densities with high levels of power delivery.