期刊
ACS APPLIED ENERGY MATERIALS
卷 6, 期 9, 页码 4844-4853出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.3c00341
关键词
core-shell heterostructure; metal-organic framework; layered double hydroxide; electrodeposition; supercapacitors
The epitaxially grown NiCo-LDH nanowrinkles on the surface of self-supported Co-MOF nanoneedles resulted in aligned nanopillar arrays through facile electrodeposition. The Co-MOF@NiCo-LDH composite exhibited extraordinary areal capacitance (44.1 F cm-2 at 5 mA cm-2), which was 7.6 and 2.6 times higher than that of bare NiCo-LDH and Co-MOF, respectively, due to the high porosity of Co-MOF, excellent redox activity of NiCo-LDH, and interfacial synergy of the core-shell multicomponent heterostructure. Furthermore, the asymmetric supercapacitor constructed with activated carbon demonstrated satisfactory energy density of 0.89 mWh cm-2 at a power density of 7.5 mW cm-2 and superior cycling stability (97.6% capacitance retention after 10,000 cycles).
The design of metal-organic framework/layered double hydroxide (MOF/LDH) heterogeneous hybrids is crucial to the enhancement of areal capacitance for supercapacitor electrodes. Herein, the NiCo-LDH nanowrinkles are evenly epitaxially grown on the surface of self-supported Co-MOF nanoneedles to form aligned nanopillar arrays by a facile electrodeposition. Thanks to the high porosity of the Co-MOF, excellent redox activity of NiCo-LDH, and interfacial synergy of the core-shell multicomponent heterostructure, the Co-MOF@NiCo-LDH composite has an extraordinary areal capacitance (44.1 F cm-2 at 5 mA cm-2), which is 7.6 and 2.6 times higher than that of the bare NiCo-LDH and Co-MOF, respectively. Furthermore, the constructed asymmetric supercapacitor with activated carbon demonstrates a satisfactory energy density of 0.89 mWh cm-2 at the power density of 7.5 mW cm-2 and superior cycling stability (97.6% capacitance retention after 10,000 cycles).
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