Construction of Hierarchical NiCo2O4@NiFe-LDH Core-Shell Heterostructure for High-performance Positive Electrode for Supercapacitor

被引:17
作者
Luo, Dapeng [1 ]
Yong, Yi [1 ]
Hou, Jiang [1 ]
Guo, Weiguang [1 ]
Liu, Hengbo [1 ]
Zhao, Xue [1 ]
Xiang, Jingrong [1 ]
Zongzong, Nima [1 ]
Han, Yuqi [1 ]
Yan, Minglei [2 ]
机构
[1] Sichuan Acad Environm Sci, Chengdu 610041, Peoples R China
[2] Sichuan Agr Univ, Coll Water Conservancy & Hydropower Engn, Yaan 625014, Sichuan, Peoples R China
来源
CHEMNANOMAT | 2022年 / 8卷 / 07期
关键词
heterostructure; NiCo2O4; NiFe-LDH; positive electrode; supercapacitors; LAYERED DOUBLE HYDROXIDE; FACILE SYNTHESIS; ARRAYS; ENERGY; NANOTUBES; NICO2O4; DESIGN; FOAM;
D O I
10.1002/cnma.202200137
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this work, the hierarchical NiCo2O4@NiFe-layered double hydroxide (NiCo2O4@NiFe-LDH) heterostructure has been successfully synthesized by sequential hydrothermal method, heat treatment and electrodeposition, which is investigated as high-performance positive electrode for supercapacitor. In this unique structure, on the one hand, the NiCo2O4 as the scaffold provide high conductivity, which accelerates the electron transfer. On other hand, the NiFe-LDH nanosheets increase the surface area, which offers abundant active sites for electrochemical reaction. Furthermore, the three-dimensional (3D) hierarchical structures are beneficial to the diffusion for electrolyte ions. Hence, the synergistic effect between NiCo2O4 and NiFe-LDH endows the optimal NiCo2O4@NiFe-LDH-150/CC with excellent electrochemical performance, such as high areal specific capacitance (1.09 F cm(-2)@1 mA cm(-2)), small charge-transfer resistance (0.35 omega) and superior cycling stability. This study demonstrates the NiCo2O4@NiFe-LDH core-shell heterostructures are promising positive electrode material for supercapacitors.
引用
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页数:7
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