Hierarchical CuO@ZnCo-OH core-shell heterostructure on copper foam as three-dimensional binder-free electrodes for high performance asymmetric supercapacitors

被引:50
|
作者
Liu, Guichao [1 ]
Song, Xue-Zhi [1 ]
Zhang, Shenpeng [1 ]
Chen, Xi [1 ]
Liu, Sihang [1 ]
Meng, Yulan [1 ]
Tan, Zhenquan [1 ]
机构
[1] Dalian Univ Technol, Sch Petr & Chem Engn, State Key Lab Fine Chem, Panjin 124221, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
Asymmetric supercapacitors; Hierarchical core-shell heterostructures; Zinc-cobalt hydroxide nanosheets; CuO nanorod Arrays; Loofah sponge carbon; LAYERED DOUBLE HYDROXIDE; IN-SITU GROWTH; NANOTUBE ARRAYS; NANOWIRE ARRAYS; ENERGY-STORAGE; NI FOAM; DESIGN; CARBON; CAPACITANCE; NANOSHEETS;
D O I
10.1016/j.jpowsour.2020.228239
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Rational architecture design and ingenious electrochemical performance optimization are highly desirable in developing high-performance asymmetric supercapacitors. Herein, a facile electrodeposition strategy is adopted to construct the hierarchical core-shell architecture of binary transitional metal hydroxide nanosheets anchored on copper foam (CF) supported three-dimensional (3D) CuO scaffolds. The synergistic contributions from different electro-active components are maximized by the heterostructures construction and components optimization. As a result, the 3D binder-free electrode of CF supported CuO@Zn1Co2-OH core-shell heterostructure achieve a high areal capacitance of 2.634 F cm(-2) at 5 mA cm(-2), enhanced rate performance (71.6% retention at 30 mA cm(-2)), and long durability (99.1% after 4000 cycles). Additionally, a CuO@Zn1Co2-OH//LSDC (loofah sponge derived carbon) asymmetric supercapacitor (ASC) is assembled with an operating voltage of 1.5 V. The ASC device delivers a maximum energy density of 0.21 mW h cm(-2) (22.10 W h kg(-1)) at a power density of 4.08 mW cm(-2) (434 W kg(-1)), and exceptional cycling stability (91.7% of capacitance retention after 4000 cycles). Of practical importance, this work broadens our horizons in fabricating novel hierarchical core-shell heterostructures for next-generation electrochemical energy-storage technologies.
引用
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页数:10
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