1 D Hierarchical MnCo2O4Nanowire@MnO2Sheet Core-Shell Arrays on Graphite Paper as Superior Electrodes for Asymmetric Supercapacitors
1 D Hierarchical MnCo2O4Nanowire@MnO2Sheet Core-Shell Arrays on Graphite Paper as Superior Electrodes for Asymmetric Supercapacitors
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DOI：
10.1002/cnma.201500105
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发表时间：
2015-12
影响因子：
6.8
通讯作者：
Shude Liu;K. S. Hui;K. Hui
中科院分区：
文献类型：
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作者：
Shude Liu;K. S. Hui;K. Hui
与单一结构相比，异质结构金属氧化物核壳结构由于在超级电容器中具有优异的电化学性能而引起了广泛关注。在这里，我们报告了一种简单有效的合成方法，用于锚定在石墨纸上的分级MnCo2O4纳米线@MnO2片核壳纳米结构，用于超级电容器。所提出的电极在 1 A g−1 时表现出 2262 F g−1 的比电容。此外，还观察到良好的倍率性能和优异的循环性能。使用 MnCo2O4@MnO2 作为阴极、石墨烯/泡沫镍 (NF) 作为阳极，演示了工作电压为 1.6 V 的不对称超级电容器。 MnCo2O4@MnO2//石墨烯/NF非对称器件在800 W kg−1的功率密度下表现出85.7 Wh kg−1的高能量密度，同时在24 kW kg−1时保持34.7 Wh kg−1的高能量密度。此外，该器件表现出长期循环稳定性，其初始比电容保留率为 81.6%。
Heterostructured metal oxide core–shell architectures have attracted considerable attention owing to their superior electrochemical performance in supercapacitors compared to a single structure. Here, we report a simple and effective synthesis of hierarchical MnCo2O4 nanowire@MnO2 sheet core–shell nanostructures anchored on graphite paper for use in supercapacitors. The proposed electrode exhibits a specific capacitance of 2262 F g−1 at 1 A g−1. In addition, good rate capability and excellent cycling performance are observed. An asymmetric supercapacitor with operating potential at 1.6 V is demonstrated using MnCo2O4@MnO2 as cathode and graphene/nickel foam (NF) as anode. The MnCo2O4@MnO2//graphene/NF asymmetric device shows a high energy density of 85.7 Wh kg−1 at a power density of 800 W kg−1 while maintaining a high energy density of 34.7 Wh kg−1 at 24 kW kg−1. Moreover, the device demonstrates a long-term cycling stability of 81.6 % retention of its initial specific capacitance.