Hierarchical core–shell structures of P-Ni(OH)2 rods@MnO2 nanosheets as high-performance cathode materials for asymmetric supercapacitors†,Nanoscale

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Hierarchical core–shell structures of P-Ni(OH)2 rods@MnO2 nanosheets as high-performance cathode materials for asymmetric supercapacitors†
Nanoscale ( IF 5.8 ) Pub Date : 2018-01-03 00:00:00 , DOI: 10.1039/c7nr06712g
Kunzhen Li _{1,

2,

3,

4} , Shikuo Li _{2,

3,

4,

5} , Fangzhi Huang _{2,

3,

4,

5} , Xin-yao Yu _{4,

6,

7,

8} , Yan Lu _{1,

2,

3,

4} , Lei Wang _{1,

2,

3,

4} , Hong Chen _{1,

2,

3,

4} , Hui Zhang _{1,

2,

3,

4}

Affiliation

The hierarchical porous structure with phosphorus-doped Ni(OH)₂ (P-Ni(OH)₂) rods as the core and MnO₂ nanosheets as the shell is fabricated directly by growth on a three-dimensional (3D) flexible Ni foam (NF) via a two-step hydrothermal process. As a binder-free electrode material, this unique hybrid structure exhibits excellent electrochemical properties, including an ultrahigh areal capacitance of 5.75 F cm⁻² at a current density of 2 mA cm⁻² and great cyclic stability without capacitance loss at a current density of 20 mA cm⁻² after 10 000 cycles. Moreover, an all-solid-state asymmetric supercapacitor (AAS) based on a P-Ni(OH)₂@MnO₂ hybrid structure on Ni foam as the cathode and activated carbon (AC) as the anode is successfully assembled to enhance value the electrochemical properties. The AAS device also shows excellent electrochemical properties including a large potential window of 0∼1.6 V, an areal capacitance is 911.3 mF cm⁻² at a current density of 1 mA cm⁻² and long-term cycling performance. Meanwhile, the AAS device also delivers a high energy density of 0.324 mW h cm⁻² at a power density of 0.8 mW cm⁻²; and can easily light colorful light-emitting diode (LED) lights, suggesting that 3D P-Ni(OH)₂@MnO₂ hybrid composite has promising potential for practical use in high-performance supercapacitors.

中文翻译：

P-Ni（OH）₂棒@MnO ₂纳米片的分层核-壳结构，作为不对称超级电容器的高性能阴极材料†

通过在三维（3D）柔性Ni泡沫上生长直接制造出以磷掺杂的Ni（OH）₂（P-Ni（OH）₂）棒为核，MnO ₂纳米片为壳的分层多孔结构。NF）通过两步水热过程。作为一种无粘结剂的电极材料，这种独特的混合结构具有出色的电化学性能，包括在2 mA cm ^-2的电流密度下具有5.75 F cm ^-2的超高面电容，以及在不存在电流密度为2的情况下无电容损耗的出色的循环稳定性。10000次循环后为20 mA cm ^-2。此外，基于P-Ni（OH）₂的全固态不对称超级电容器（AAS）以镍泡沫为阴极，活性炭（AC）为阳极，成功组装了@MnO ₂杂化结构，以提高电化学性能。该AAS装置也显示出优异的电化学性质，包括0~1.6 V的大的电势窗，以面积电容是911.3 mF及其厘米^-2在1毫安cm 2的电流密度^-2和长期循环性能。同时，AAS装置还提供0.324毫瓦高厘米高能量密度^-2在功率密度0.8毫瓦厘米^-2 ; 并且可以轻松地点亮彩色发光二极管（LED）的光，这表明3D P-Ni（OH）₂ @MnO ₂ 混合复合材料在高性能超级电容器中具有实际应用前景。

更新日期：2018-01-03

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