Trimetallic layered double hydroxides with a hierarchical heterostructure for high-performance supercapcitors
Journal of Energy Storage(2023)
摘要
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 devices effectively.
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关键词
Layered double hydroxides,Hierarchical heterostructure,Nanocages,Energy storage,Supercapacitors
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