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Unique MOF-derived hierarchical MnO2 nanotubes@NiCo-LDH/CoS2 nanocages materials as high performance supercapacitor

Abstract

The nanostructure is most important in the development of high performance supercapacitors. In this work, we designed and developed a new one-dimensional hierarchical hollow nickel-cobalt layered double hydroxide nanocages assembled on MnO2 nanotubes with uniformly dispersed CoS2 nanoparticles, MnO2@NiCo-LDH/CoS2, using zeolitic imidazolate skeleton (ZIF-67) as template via multiple hydrothermal and sulfuration processes. This unique one-dimensional hierarchical nanostructure is characterized by high specific area, high structural stability, and the presence of CoS2 nanoparticles with the nanocage increases the electrical conductivity and enhances the stability of the structure. Electrochemical studies show that MnO2@NiCo-LDH/CoS2 electrode materials have a high specific capacitance of 1547 F g−1 at a current density of 1 A g−1 and 1189 F g−1 at 10 A g−1, exhibiting high rate performance (76.9%) and high stability (82.3%), substantially better than most recently reported performance of similar systems. The asymmetric energy supercapacitor assembled with MnO2@NiCo-LDH/CoS2 and activated carbon has a maximum energy density of 49.5 Wh kg−1 and a maximum power density of 9657.6 W kg−1. The unique nanostructure and excellent performance of the present studies demonstrate a new platform for the developing highly efficient supercapacitor materials with high energy density and high power density.

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Publication details

The article was received on 21 Feb 2019, accepted on 05 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01951K
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Unique MOF-derived hierarchical MnO2 nanotubes@NiCo-LDH/CoS2 nanocages materials as high performance supercapacitor

    X. Wang, F. Huang, F. Rong, P. He, R. Que and S. P. Jiang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01951K

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