Composites of NiMoO4@Ni-Co LDH@NiCo2O4 on Ni foam with a rational microscopic morphology for high-performance asymmetric supercapacitors

•NiMoO4@Ni-Co LDH@NiCo2O4 with core-shell structure was successfully designed.•Discuss the influence of electrodeposition time on electrochemical performance.•Asymmetric supercapacitors exhibit a high voltage window of 1.8 V.•NiMoO4@Ni-Co LDH@NiCo2O4 shows a high energy density in asymmetric superca...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-05, Vol.902, p.163749, Article 163749
Main Authors: Hu, Cunhai, Gong, Jiaxu, Wang, Jiaheng, Zhou, Tianlong, Xie, Mingzhen, Wang, Shuai, Dai, Yatang
Format: Article
Language:English
Subjects:
Activated carbon
Asymmetry
Composite materials
Core-shell structure
Energy storage
Flux density
Metal foams
Molybdates
Nanorods
Ni-Co LDH
Nickel compounds
NiCo2O4
NiMoO4
Shells
Specific capacity
Structural stability
Supercapacitor
Supercapacitors
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Summary:•NiMoO4@Ni-Co LDH@NiCo2O4 with core-shell structure was successfully designed.•Discuss the influence of electrodeposition time on electrochemical performance.•Asymmetric supercapacitors exhibit a high voltage window of 1.8 V.•NiMoO4@Ni-Co LDH@NiCo2O4 shows a high energy density in asymmetric supercapacitor. [Display omitted] The structural stability and high capacity of material enable a wide range of applications for asymmetric supercapacitors. In this work, we design a simple route to synthesize NiMoO4@Ni-Co LDH@NiCo2O4 composites on Ni foam. The NiMoO4@Ni-Co LDH@NiCo2O4 has a stable nanorod/nanosheet core-shell structure. In addition, the NiMoO4@Ni-Co LDH150@NiCo2O4 exhibits a high specific capacity of 1035 C g−1 and retained 80.6% of the original capacity after 5000 cycles. Moreover, the asymmetric supercapacitor is assembled by activated carbon and NiMoO4@Ni-Co LDH150@NiCo2O4 as two electrodes respectively, which shows a high energy density of 66.8 Wh kg−1 at a power density of 900 W kg−1. In the meantime, the asymmetric supercapacitor achieved a high voltage window of 1.8 V. The stable core-shell structure of NiMoO4@Ni-Co LDH@NiCo2O4 achieved a high energy density, which shows great potential for energy storage.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.163749