Core-shell heterostructure Cu(OH)2@NiCoPO4 nanorod arrays constructed by electrochemical deposition for hybrid supercapacitor electrode material

Electrochemical deposition can be used to make three-dimensional nanoarray core-shell heterostructures that can effectively solve the issues of low rate performance and small capacity caused by agglomeration and morphological collapse. NiCo phosphates synthesized using conventional methods are susce...

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Bibliographic Details
Published in:Electrochimica acta 2024-11, Vol.505, p.144964, Article 144964
Main Authors: Lan, Yongzhi, Wang, Qing, Yu, Rui, Dai, Jianfeng, zhang, Qi, Deng, Xiaoyu
Format: Article
Language:English
Subjects:
Core-shell heterostructure
Electrochemical deposition
Nanorod arrays
Supercapacitor
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Summary:Electrochemical deposition can be used to make three-dimensional nanoarray core-shell heterostructures that can effectively solve the issues of low rate performance and small capacity caused by agglomeration and morphological collapse. NiCo phosphates synthesized using conventional methods are susceptible to agglomeration and experience inevitable volume collapse during prolonged charging and discharging cycles. Core-shell heterostructures are created by electropositing lamellar NiCoPO4 on arrays of Cu(OH)2 nanorods. This structure shortens the ionic transport distance and preserves the excellent electrical conductivity of NiCoPO4, in addition to offering a greater surface area for the growth of NiCoPO4, increasing the reactive sites. Furthermore, electrodeposition can reduce material aggregation, enabling tight contact between NiCoPO4 and the Cu(OH)2 skeleton. This enhances the material's mechanical stability and successfully avoids the collapse issue. Results showed that the Cu(OH)2@NiCoPO4/CF composite demonstrated an elevated specific capacitance of 208.54 mAh g-1 at 1 A g-1, and it maintained 80.03 % of its original capacity after 10,000 cycles. The Cu(OH)2@NiCoPO4/CF//AC HSC device that was made showed great cycling stability, keeping 119.80 % of its charge after 30,000 charge/discharge cycles at 10 A g-1. It also offers an outstanding energy density of 52.16 Wh kg-1 (800.85 W kg-1). The electrochemical performance of bimetallic NiCo phosphates may be significantly enhanced by their structural design, offering new possibilities for the advancement of phosphates in electrode materials.
ISSN:0013-4686
DOI:10.1016/j.electacta.2024.144964