Facile synthesis of an accordion-like Ni-MOF superstructure for high-performance flexible supercapacitors

Yan Yan, Peng Gu, Shasha Zheng, Mingbo Zheng, Huan Pang* and Huaiguo Xue*

College of Chemistry and Chemical Engineering, Yangzhou University

Abstract: Metal–organic frameworks have received increasing attention as promising electrode materials in supercapacitors. In this study, we have successfully synthesized a novel accordion-like Ni-MOF superstructure ([Ni₃(OH)₂(C₈H₄O₄)₂(H₂O)₄]·2H₂O), for the first time, and used it as an electrode material for supercapacitors. The supercapacitors with the novel electrode exhibited excellent electrochemical performance. For example, the accordion-like Ni-MOF electrode showed specific capacitances of 988 and 823 F g⁻¹at current densities of 1.4 and 7.0 A g⁻¹, respectively, while maintaining outstanding cycling stability (capacitance retention of 96.5% after 5000 cycles at a current density of 1.4 A g⁻¹). More importantly, the accordion-like Ni-MOF and activated carbons were assembled into a high-performance flexible solid-state asymmetric supercapacitor with a specific capacitance of 230 mF cm⁻²at a current density of 1.0 mA cm⁻². The cycle test showed that the device can offer 92.8% capacity of the initial capacitance at 5.0 mA cm⁻²after 5000 cycles with little decay. The maximum energy density of the device can achieve 4.18 mW h cm⁻³and the maximum power density can also achieve 231.2 mW cm⁻³.

Journal of Materials Chemistry A, 2016, 4, 19078-19085; IF=8.262, SCI

文章链接:http://pubs.rsc.org/en/content/articlelanding/2016/ta/c6ta08331e

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