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3D Hierarchical structure Electrodes of MnO2 Nanosheets Decorated on Needle‐like NiCo2O4 Nanocones on Ni Foam as a cathode material for Asymmetric Supercapacitors
ChemistrySelect ( IF 1.9 ) Pub Date : 2019-05-21 , DOI: 10.1002/slct.201901018
Bo Ren 1, 2 , Meiqing Fan 1, 2, 3 , Xiaodong Yang 1 , Lei Wang 2 , Haixia Yu 2
ChemistrySelect ( IF 1.9 ) Pub Date : 2019-05-21 , DOI: 10.1002/slct.201901018
Bo Ren 1, 2 , Meiqing Fan 1, 2, 3 , Xiaodong Yang 1 , Lei Wang 2 , Haixia Yu 2
Affiliation
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In this work, three dimensional (3D) hierarchical structure electrode of MnO2 nanosheets decorated on needle‐like NiCo2O4 nanocones hybrid arrays on Ni foam is designed by a two‐step hydrothermal process. In this special structure, 3D hierarchical NiCo2O4/MnO2 core/shell composites have high specific surface area and large pore structure, which makes it easier to reach the active site, and shorten the ion transport path. Used as electrode for supercapacitors, the composites can develop their respective strengths, and the synergies between different components can also improve capacitance and speed capacity. The electrochemical results exhibit that the NiCo2O4/MnO2 core/shell electrodes display a large capacitance of 816 F⋅g−1 at the current density of 5 mA⋅cm−2, and show an excellent cycling stability (81% retention after 5000 cycles). Four Asymmetric supercapacitors (NiCo2O4/MnO2//BPC (banana peel), NiCo2O4/MnO2//BHC (buckwheat husk), NiCo2O4/MnO2//PPC (pomelo peel), and NiCo2O4/MnO2//AC (activated carbon)) using the NiCo2O4/MnO2 core/shell as a positive electrode and biochar as a negative electrode are assembled. The results indicate that all the asymmetric supercapacitors deliver a high operation voltage of 1.6 V, and NiCo2O4/MnO2//BPC exhibits excellent specific capacitance (85.4 F⋅g−1 at the current density of 5 mA⋅cm−2), high energy density (30.4 Wh⋅kg−1 at the power density of 133.5 W⋅kg−1) and remarkable cycling stability (only decrease by 12% after 5000 cycles).
中文翻译:
镍泡沫上的针状NiCo2O4纳米锥上装饰的MnO2纳米片的3D分层结构电极作为不对称超级电容器的阴极材料
在这项工作中,通过两步水热工艺设计了装饰在镍泡沫上的针状NiCo 2 O 4纳米锥混合阵列上的MnO 2纳米片的三维(3D)分层结构电极。在这种特殊的结构中,3D分层NiCo 2 O 4 / MnO 2核/壳复合材料具有较高的比表面积和较大的孔结构,这使其更易于到达活性位点,并缩短了离子传输路径。复合材料用作超级电容器的电极,可以发挥各自的强度,并且不同组件之间的协同作用还可以改善电容和提速能力。电化学结果表明,NiCo 2O 4 / MnO 2芯/壳电极在5 mA·cm -2的电流密度下显示出816 F·g -1的大电容,并显示出优异的循环稳定性(5000次循环后保持率81%)。四个不对称超级电容器(NiCo 2 O 4 / MnO 2 // BPC(香蕉皮),NiCo 2 O 4 / MnO 2 // BHC(荞麦皮),NiCo 2 O 4 / MnO 2 // PPC(柚皮)和NiCo 2 O 4 / MnO 2 // AC(活性炭)使用NiCo 2 O 4组装作为正极的/ MnO 2核/壳和作为负极的生物炭。结果表明,所有非对称超级电容器均提供1.6 V的高工作电压,并且NiCo 2 O 4 / MnO 2 // BPC在电流密度为5 mA·cm -2时表现出出色的比电容(85.4F⋅g -1),高能量密度(功率密度为133.5 W· kg -1时为30.4 Wh· kg -1)和出色的循环稳定性(5000次循环后仅降低12%)。
更新日期:2019-05-21
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
镍泡沫上的针状NiCo2O4纳米锥上装饰的MnO2纳米片的3D分层结构电极作为不对称超级电容器的阴极材料
在这项工作中,通过两步水热工艺设计了装饰在镍泡沫上的针状NiCo 2 O 4纳米锥混合阵列上的MnO 2纳米片的三维(3D)分层结构电极。在这种特殊的结构中,3D分层NiCo 2 O 4 / MnO 2核/壳复合材料具有较高的比表面积和较大的孔结构,这使其更易于到达活性位点,并缩短了离子传输路径。复合材料用作超级电容器的电极,可以发挥各自的强度,并且不同组件之间的协同作用还可以改善电容和提速能力。电化学结果表明,NiCo 2O 4 / MnO 2芯/壳电极在5 mA·cm -2的电流密度下显示出816 F·g -1的大电容,并显示出优异的循环稳定性(5000次循环后保持率81%)。四个不对称超级电容器(NiCo 2 O 4 / MnO 2 // BPC(香蕉皮),NiCo 2 O 4 / MnO 2 // BHC(荞麦皮),NiCo 2 O 4 / MnO 2 // PPC(柚皮)和NiCo 2 O 4 / MnO 2 // AC(活性炭)使用NiCo 2 O 4组装作为正极的/ MnO 2核/壳和作为负极的生物炭。结果表明,所有非对称超级电容器均提供1.6 V的高工作电压,并且NiCo 2 O 4 / MnO 2 // BPC在电流密度为5 mA·cm -2时表现出出色的比电容(85.4F⋅g -1),高能量密度(功率密度为133.5 W· kg -1时为30.4 Wh· kg -1)和出色的循环稳定性(5000次循环后仅降低12%)。