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

Nanoscale
Youzhang HuangHongbing Zhan

Abstract

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 de...Continue Reading

References

Oct 29, 2008·Nature Materials·Patrice Simon, Yury Gogotsi
Jul 23, 2011·Chemical Society Reviews·Guoping WangJiujun Zhang
Nov 19, 2011·Science·Bruce DunnJean-Marie Tarascon
Mar 15, 2014·Science·Patrice SimonBruce Dunn
Nov 26, 2016·Advanced Materials·Bu Yuan GuanXiong Wen David Lou

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Citations

Nov 16, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Qin LiLei Han
May 27, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Bahareh AmeriSaied Saeed Hosseiny Davarani
Oct 12, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Xueyan ZhaoLei Han
Nov 17, 2021·ACS Applied Materials & Interfaces·Pratigya SharmaRajeev Ahuja

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Methods Mentioned

BETA
scanning
transmission electron microscopy
X-ray
electron diffraction

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