4.7 Article

Trimetallic layered double hydroxides with a hierarchical heterostructure for high-performance supercapcitors

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JOURNAL OF ENERGY STORAGE
卷 61, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.est.2023.106700

关键词

Layered double hydroxides; Hierarchical heterostructure; Nanocages; Energy storage; Supercapacitors

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In this study, a hierarchical heterostructure of MnCo-LDH/NiCo-LDH array is designed on nickel foam, composed of 1D nanoneedles, 2D nanosheets, and 3D hollow nanocages. This structure is synthesized using trimetallic co-doping, in-situ co-precipitation, and hydrothermal techniques. The hierarchical nanostructure exhibits high specific capacitance and energy density, as well as excellent cycling stability.
Hierarchical nanostructures have attracted intensive attention due to their ability to boost electrochemical performance. However, it remains challenging to construct such intriguing structures. In the present work, a MnCo-LDH/NiCo-LDH array with hierarchical heterostructures is designed based on 1D nanoneedles, 2D nanosheets, and 3D hollow nanocages on nickel foam. It is synthesized by combined trimetallic co-doping, in-situ co-precipitation, and hydrothermal techniques. Benefiting from the delicately structure, the MnCo-LDH/NiCo-LDH array exhibits a specific capacitance of 1778.2 F g-1 at a current density of 1 A g-1. Furthermore, an asymmetric supercapacitor composed of positive MnCo-LDH/NiCo-LDH electrode and a negative activated carbon electrode offers an energy density of 36.9 Wh kg-1 at a power density of 750.0 W kg-1. The ASC device features outstanding cycling stability (e.g., 91.4 % of initial capacitance even after 8000 charge/discharge cycles at a current density of 7 A g-1). Therefore, the hierarchical nanostructure provides an effective strategy to construct high-performance electrodes. The assembled flexible ASCs are demonstrated to power electronic de-vices effectively.

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