MOF-assisted construction of a Co9 S8 @Ni3 S2 /ZnS microplate array with ultrahigh areal specific capacity for advanced supercapattery

Dalton Transactions : an International Journal of Inorganic Chemistry
Hongmei ChenLei Han

Abstract

Transition metal sulfides are important candidates of battery-type electrode materials for advanced supercapatteries due to their high electric conductivity and electrochemical activity. The Co9S8@Ni3S2/ZnS composite microplate array was prepared by a metal-organic framework-assisted strategy because the electrochemical properties of composite arrays are governed by the synergistic effects of their diverse structures and compositions. As a battery-type material, the Co9S8@Ni3S2/ZnS electrode expressed an ultrahigh areal specific capacity of 8192 C cm-2 at the current density of 2 mA cm-2, and excellent cycling stability of 79.7% capacitance retention after 4000 cycles. An assembled supercapattery device using the Co9S8@Ni3S2/ZnS microplate array as a positive electrode and active carbon as the negative electrode delivered a high energy density of 0.377 mW h cm-2 at a high power density of 1.517 mW cm-2, and outstanding retention of 95.2% after 5000 cycles. As a result, the obtained Co9S8@Ni3S2/ZnS shows potential for applications in high-performance supercapattery.

References

Oct 29, 2008·Nature Materials·Patrice Simon, Yury Gogotsi
Jul 23, 2011·Chemical Society Reviews·Guoping WangJiujun Zhang
Mar 22, 2012·Accounts of Chemical Research·Katsuhiko NaoiTakeo Kamino
Mar 15, 2014·Science·Patrice SimonBruce Dunn
Jan 28, 2015·Chemical Society Reviews·D P DubalP Gómez-Romero
Jun 16, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Guo-Chang LiLei Han
Sep 8, 2016·Nature Communications·Maria R LukatskayaYury Gogotsi
Mar 28, 2018·ACS Nano·Yury Gogotsi, Reginald M Penner

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Methods Mentioned

BETA
X-ray
electron diffraction

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