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Issue 37, 2019
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Construction of NiCo2O4 nanosheet-decorated leaf-like Co3O4 nanoarrays from metal–organic framework for high-performance hybrid supercapacitors

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Abstract

A rational design of heterostructures for electrode materials is highly desired for boosting the electrochemical performance, but it is still challenging, especially through a cost-effective method. Herein, novel NiCo2O4 nanosheet-decorated leaf-like Co3O4 nanoarrays have been constructed on a Ni foam using a leaf-like Co-based metal–organic framework (Co-MOF-L) template, which can be simply prepared in an aqueous solution at room temperature. Combining the merits of MOF derivatives and the free-standing core–shell heterostructure, the leaf-like Co3O4@NiCo2O4 nanoarray electrode displayed a high specific capacity of 544.2 C g−1 at 1 A g−1, which is almost 9.3 times that of Co3O4 (58.3 C g−1) and 6 times that of NiCo2O4 (92.1 C g−1). It also displayed a good rate capacity (65.5% at 10 A g−1) and superior long-term stability (93.0% capacity retention over 5000 cycles at 10 A g−1). Moreover, a hybrid supercapacitor (HSC) assembled from the battery-type Co3O4@NiCo2O4 electrode and a capacitive activated carbon (AC) electrode delivered a high energy density of 36 W h kg−1 at a high power density of 852 W kg−1 with good cycling stability, demonstrating a capacity retention of 89.5% after 10 000 cycles at 10 A g−1. Furthermore, two connected HSCs could light up a red light-emitting diode (LED). Therefore, the as-fabricated leaf-like Co3O4@NiCo2O4 nanoarrays hold great promise as binder-free electrodes in electrochemical energy storage devices.

Graphical abstract: Construction of NiCo2O4 nanosheet-decorated leaf-like Co3O4 nanoarrays from metal–organic framework for high-performance hybrid supercapacitors

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Supplementary files

Article information


Submitted
15 Jul 2019
Accepted
28 Aug 2019
First published
28 Aug 2019

Dalton Trans., 2019,48, 14156-14163
Article type
Paper

Construction of NiCo2O4 nanosheet-decorated leaf-like Co3O4 nanoarrays from metal–organic framework for high-performance hybrid supercapacitors

K. Tao, Y. Yang, C. Yang, Q. Ma and L. Han, Dalton Trans., 2019, 48, 14156
DOI: 10.1039/C9DT02907A

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