Here, we report a facile and easily scalable hydrothermal synthetic strategy to synthesize Ni-V layered double hydroxide (NiV LDH) nanosheets toward high-energy and high-power-density supercapacitor applications. NiV LDH nanosheets with varying Ni-to-V ratios were prepared. Three-dimensional curved nanosheets of NiV LDH showed better electrochemical performance compared to other synthesized NiV LDHs. The electrode coated with NiV LDH nanosheets in a three-electrode cell configuration showed excellent pseudocapacitive behavior, having a high specific capacity of 711 C g (1581 F g) at a current density of 1 A g in 2 M KOH. The material showed an excellent rate capability and retained the high specific capacity of 549 C g (1220 F g) at a current density of 10 A g and low internal resistances. Owing to its superior performance, NiV LDH nanosheets were used as positive electrode and commercial activated carbon was used as negative electrode for constructing a hybrid supercapacitor (HSC) device, having a working voltage of 1.5 V. The HSC device exhibited a high specific capacitance of 98 F g at a current density of 1 A g. The HSC device showed a higher energy density of 30.6 Wh kg at a power density of 0.78 kW kg and maintained a high value of 24 Wh kg when the power density was increased to 11.1 kW kg. The performance of NiV LDHs nanosheets indicates their great potential as low-cost electrode material for future energy-storage devices.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648373 | PMC |
http://dx.doi.org/10.1021/acsomega.8b03618 | DOI Listing |
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