Construction of MOF-derived hollow Ni-Zn-Co-S nanosword arrays as binder-free electrodes for asymmetric supercapacitors with high energy density

被引:144
作者
Huang, Youzhang [1 ]
Quan, Liang [1 ]
Liu, Tianqing [1 ]
Chen, Qidi [1 ]
Cai, Daoping [1 ]
Zhan, Hongbing [1 ,2 ]
机构
[1] Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350108, Fujian, Peoples R China
[2] Fuzhou Univ, Key Lab Ecomat Adv Technol, Fuzhou 350108, Fujian, Peoples R China
关键词
NICKEL-COBALT SULFIDE; NANOSHEET ARRAYS; BISMUTH OXIDE; STORAGE; FOAM; FRAMEWORKS; NI3S2; PSEUDOCAPACITANCE; GRAPHENE;
D O I
10.1039/c8nr03919d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Mixed transition metal sulfides with hollow structures hold great promise for energy-related applications. However, most of them are in the powder form, which should be mixed with unwanted polymer binders and conductive agents. In this study, a facile two-step strategy has been developed to grow mesoporous and hollow Ni-Zn-Co-S nanosword arrays (NSAs) on a nickel foam (NF) substrate with robust adhesion, which involves the hydrothermal growth of bimetallic Zn-Co-ZIF NSAs on NF and subsequent transformation into hollow Ni-Zn-Co-S NSAs through the sulfurization process. Benefiting from the unique structural and compositional advantages as well as directly grown conductive substrate, the Ni-Zn-Co-S-0.33 NSAs/NF electrode exhibits the best electrochemical performance when investigated as a binder-free electrode for supercapacitors. Impressively, the Ni-Zn-Co-S-0.33 NSAs/NF electrode delivers a high areal capacity of 1.11 mA h cm(-2) at the current density of 10 mA cm(-2), and the corresponding specific capacity is as high as 358.1 mA h g(-1). Moreover, an asymmetric supercapacitor (ASC) device based on the Ni-Zn-Co-S-0.33 NSAs/NF as the positive electrode and Bi2O3/NF as the negative electrode has been successfully fabricated, and can deliver a high energy density of 91.7 W h kg(-1) at a power density of 458 W kg(-1) and maintain the energy density of 66.9 W h kg(-1) at a high power density of 6696 W kg(-1). The electrochemical results suggest that the hollow Ni-Zn-Co-S NSAs would possess great potential for applications in high-performance supercapacitors.
引用
收藏
页码:14171 / 14181
页数:11
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