Monodisperse MnO2@NiCo2O4 core/shell nanospheres with highly opened structures as electrode materials for good-performance supercapacitors

Monodisperse MnO2@NiCo2O4 core/shell nanospheres with highly opened structures as electrode materials for good-performance supercapacitors
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具有高度开放结构的单分散MnO2@NiCo2O4核/壳纳米球作为高性能超级电容器的电极材料

DOI:
10.1016/j.apsusc.2018.03.049
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发表时间:
2018-06
影响因子:
6.7
通讯作者:
Cao Feifei
Cao Feifei
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhou You;Ma Li;Gan Mengyu;Ye Menghan;Li Xiurong;Zhai Yanfang;Yan Fabing;Cao Feifei

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采用两步溶液法和简单的后退火工艺,设计并合成了单分散MnO2@NiCo2O4核/壳纳米微球.在复合材料中,MnO 2(“核”)和NiCo 2 O 4(“壳”)都是由纳米片的积累形成的。因此,几乎所有的核/壳纳米片都是高度开放的,并且可接近电解质,使它们充分发挥法拉第反应。结果表明,该复合电极具有良好的赝电容特性,具有较高的比电容(1127.27 F g− 1,电流密度为1 A g−1),更好的倍率性能(从1至16 A g−1为81.0%)和上级的循环稳定性(实际上在10A g-1下1000次循环后126.8%的电容保持率和10,000次循环后仅3.7%的损失)。此外,它在800 W kg−1的比功率密度下具有26.6 Wh kg− 1的优异比能量密度。MnO2@NiCo2O4核壳结构纳米微球具有优异的电化学性能,有望成为下一代超级电容器的电极材料。
The monodisperse MnO2@NiCo2O4core/shell nanospheres for good-performance supercapacitors are designed and synthesized by a two-step solution-based method and a simple post annealing process. In the composite, both MnO2(the “core”) and NiCo2O4(the “shell”) are formed by the accumulation of nanoflakes. Thus, nearly all the core/shell nanoflakes are highly opened and accessible to electrolyte, making them give full play to the Faradaic reaction. Our results demonstrate that the composite electrode exhibits desirable pseudocapacitive behaviors with higher specific capacitance (1127.27 F g−1at a current density of 1 A g−1), better rate capability (81.0% from 1 to 16 A g−1) and superior cycling stability (actually 126.8% capacitance retention after 1000 cycles and only 3.7% loss after 10,000 cycles at 10 A g−1) in 3 M KOH aqueous solution. Moreover, it offers the excellent specific energy density of 26.6 Wh kg−1at specific power density of 800 W kg−1. The present MnO2@NiCo2O4core/shell nanospheres with remarkable electrochemical properties are considered as potential electrode materials for the next generation supercapacitors.
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