Tuning the electrochemical performance of NiCo2O4@NiMoO4 core-shell heterostructure by controlling the thickness of the NiMoO4 shell

•Alkali source was used to adjust the thickness of the NiMoO4 shell in the NiCo2O4@NiMoO4 core-shell heterostructure.•The dependence of electrochemical performance on the thickness of the NiMoO4 shell was researched.•The heterostructure electrode with a thick NiMoO4 shell exhibits better electrochem...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2019-08, Vol.370, p.400-408
Main Authors: Zhang, Huifang, Lu, Chunxiang, Hou, Hua, Ma, Yuanyuan, Yuan, Shuxia
Format: Article
Language:English
Subjects:
Heterostructure
Hydrothermal
NiCo2O4@NiMoO4
Shell thickness
Supercapacitor
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Summary:•Alkali source was used to adjust the thickness of the NiMoO4 shell in the NiCo2O4@NiMoO4 core-shell heterostructure.•The dependence of electrochemical performance on the thickness of the NiMoO4 shell was researched.•The heterostructure electrode with a thick NiMoO4 shell exhibits better electrochemical performance. Core-shell heterostructure nanomaterials are promising candidate for supercapacitor electrodes owing to their effective electrolyte accessibility and rapid electrons transport rates. In this work, multi-dimensional core-shell NiCo2O4@NiMoO4 nanowires/nanosheets arrays are successfully grown on carbon cloth via a two-step hydrothermal route coupled with post annealing process. The thickness of NiMoO4 shell can be easily controlled by using a alkali sources or not in the secondary hydrothermal process and the dependence of electrochemical performance on the NiMoO4 shell thickness is researched. Owing to a higher specific surface area, lower electrons transfer resistance and good strain accommodation, the heterostructure electrode with a thick NiMoO4 shell exhibits the optimal electrochemical performance, showing a high areal capacitance of 2522 mF cm−2 and superior cycle performance of 89.8% capacitance retention over 5000 cycles. Moreover, using it as positive electrode and activated carbon as negative electrode, the fabricated asymmetric supercapacitor delivers a maximum energy density of 53.3 Wh kg−1 at 750 W kg−1, indicating its promising applications as efficient electrode for supercapacitors.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2019.03.168