Journal
ENERGY & ENVIRONMENTAL MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY
DOI: 10.1002/eem2.12545
Keywords
amorphous nanosheets; aqueous supercapacitor; high volumetric; areal energy density; NiCo-LDH; room temperature synthesis
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A simple scalable method for fabricating electrodes with high capacity and wide voltage range was developed. Noncrystalline NiCo-LDH nanosheets were synthesized on activated carbon cloth substrate, demonstrating high areal capacities and excellent cycling performance. Furthermore, by constructing an asymmetric supercapacitor, high energy densities were achieved.
Developing a simple scalable method to fabricate electrodes with high capacity and wide voltage range is desired for the real use of electrochemical supercapacitors. Herein, we synthesized amorphous NiCo-LDH nanosheets vertically aligned on activated carbon cloth substrate, which was in situ transformed from Co-metal-organic framework materials nano-columns by a simple ion exchange process at room temperature. Due to the amorphous and vertically aligned ultrathin structure of NiCo-LDH, the NiCo-LDH/activated carbon cloth composites present high areal capacities of 3770 and 1480 mF cm(-2) as cathode and anode at 2 mA cm(-2), and 79.5% and 80% capacity have been preserved at 50 mA cm(-2). In the meantime, they all showed excellent cycling performance with negligible change after >10 000 cycles. By fabricating them into an asymmetric supercapacitor, the device achieves high energy densities (5.61 mWh cm(-2) and 0.352 mW cm(-3)). This work provides an innovative strategy for simplifying the design of supercapacitors as well as providing a new understanding of improving the rate capabilities/cycling stability of NiCo-LDH materials.
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