Hybrid MnO2@NiCo2O4 nanosheets for high performance asymmetric supercapacitors,Inorganic Chemistry Frontiers

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Hybrid MnO2@NiCo2O4 nanosheets for high performance asymmetric supercapacitors
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-04-04 00:00:00 , DOI: 10.1039/c8qi00170g
Depeng Zhao _{1,

2,

3,

4} , Xiang Wu _{1,

2,

3,

4} , Chuanfei Guo _{5,

6,

7,

8}

Affiliation

NiCo₂O₄ is a promising material for supercapacitors because of its high theoretical capacity. However, this material often suffers from low cycling stability. In this work, hybrid MnO₂@NiCo₂O₄ nanosheets grown on Ni foam have been synthesized through a facile hydrothermal approach. The MnO₂@NiCo₂O₄ electrode delivers a high specific capacitance of 3086 mF cm⁻² at a current density of 2 mA cm⁻², and the as-assembled asymmetric supercapacitors yield a high energy density of 72.1 W h kg⁻¹ and an excellent cycle life with a 97.3% capacitance retention after 6000 cycles. The outstanding electrochemical performance could be attributed to the unique hybrid structures of the electrode materials. This shows that the MnO₂@NiCo₂O₄ hybrid structures as the electrode materials might be potentially useful for next generation high performance supercapacitors.

中文翻译：

高性能非对称超级电容器的 MnO ₂ @NiCo ₂ O ₄杂化纳米片

NiCo ₂ O ₄具有很高的理论容量，因此是用于超级电容器的有前途的材料。然而，这种材料经常遭受低循环稳定性的困扰。在这项工作中，已经通过一种简便的水热方法合成了在Ni泡沫上生长的MnO ₂ @NiCo ₂ O ₄杂化纳米片。MnO ₂ @NiCo ₂ O ₄电极在2 mA cm ^-2的电流密度下可提供3086 mF cm ^-2的高比电容，组装后的不对称超级电容器可产生72.1 W h kg ^-1的高能量密度。使用寿命长，在6000次循环后的电容保持率为97.3％。出色的电化学性能可归因于电极材料的独特混合结构。这表明，作为电极材料的MnO ₂ @NiCo ₂ O ₄杂化结构可能对下一代高性能超级电容器有用。

更新日期：2018-04-04

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