Superior Performance Asymmetric Supercapacitors Based on Flake-like Co/Al Hydrotalcite and Graphene

Lin, Worong; Yu, Wendan; Hu, Zhaoxia; Ouyang, Wenpeng; Shao, Xiaofeng; Li, Ruchun; Yuan, Ding

doi:10.1016/j.electacta.2014.08.024

Cited by 25 publications

(15 citation statements)

References 45 publications

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“…Most of the pores lie in the mesoporous range of 2–50 nm, thereby enhancing the electrochemical performance of the NiV LDHs. 50 The BET surface area is higher for Ni 0.80 V 0.20 LDH due to its more exfoliated morphology compared to Ni 0.67 V 0.33 LDH and Ni 0.75 V 0.25 LDH, as supported by FESEM studies. Fourier transform infrared (FTIR) analysis was carried out to know the bonding between the interlayers of LDHs.…”

Section: Resultsmentioning

confidence: 66%

Hydrothermally Tailored Three-Dimensional Ni–V Layered Double Hydroxide Nanosheets as High-Performance Hybrid Supercapacitor Applications

et al. 2019

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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 Ni 0.80 V 0.20 LDH showed better electrochemical performance compared to other synthesized NiV LDHs. The electrode coated with Ni 0.80 V 0.20 LDH nanosheets in a three-electrode cell configuration showed excellent pseudocapacitive behavior, having a high specific capacity of 711 C g –1 (1581 F g –1 ) at a current density of 1 A g –1 in 2 M KOH. The material showed an excellent rate capability and retained the high specific capacity of 549 C g –1 (1220 F g –1 ) at a current density of 10 A g –1 and low internal resistances. Owing to its superior performance, Ni 0.80 V 0.20 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 –1 at a current density of 1 A g –1 . The HSC device showed a higher energy density of 30.6 Wh kg –1 at a power density of 0.78 kW kg –1 and maintained a high value of 24 Wh kg –1 when the power density was increased to 11.1 kW kg –1 . The performance of NiV LDHs nanosheets indicates their great potential as low-cost electrode material for future energy-storage devices.

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Section: Resultsmentioning

confidence: 66%

Hydrothermally Tailored Three-Dimensional Ni–V Layered Double Hydroxide Nanosheets as High-Performance Hybrid Supercapacitor Applications

et al. 2019

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“…However, relatively low specific capacitance (~200 F g −1 ) is the major drawback for EDL capacitors. Alternatively, metal oxide 10 11 12 13 14 15 , metal hydroxide 16 17 , layered double hydroxides 5 18 19 and conducting polymers 12 20 21 22 23 are commonly used as pseudocapacitive materials. They store charges via superficial Faradic reactions and exhibit higher specific capacitance than EDL materials.…”

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confidence: 99%

Large Scale Synthesis of NiCo Layered Double Hydroxides for Superior Asymmetric Electrochemical Capacitor

Shao

et al. 2016

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201

122

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We report a new environmentally-friendly synthetic strategy for large-scale preparation of 16 nm-ultrathin NiCo based layered double hydroxides (LDH). The Ni50Co50-LDH electrode exhibited excellent specific capacitance of 1537 F g−1 at 0.5 A g−1 and 1181 F g−1 even at current density as high as 10 A g−1, which 50% cobalt doped enhances the electrical conductivity and porous and ultrathin structure is helpful with electrolyte diffusion to improve the material utilization. An asymmetric ultracapacitor was assembled with the N-doped graphitic ordered mesoporous carbon as negative electrode and the NiCo LDH as positive electrode. The device achieves a high energy density of 33.7 Wh kg−1 (at power density of 551 W kg−1) with a 1.5 V operating voltage.

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“…The wavelength used for the XRD analysis was the 1.7890 line of a Co-K α source. All diffraction peaks designated in the figure correspond to the pure hydrotalcite structure (JCPDS:38-0487) with the characteristics peaks of (003), (006), (012), (015) and (018) planes 47,48 . The XRD data suggest that CoAl-LDH preferentially grows in the (003) crystallographic direction.…”

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confidence: 99%

High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

et al. 2016

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An asymmetric supercapacitor fabricated with CoAl-layered double hydroxide/graphene foam (LDH/GF) composite as the positive electrode and activated carbon derived from expanded graphite (AEG) as negative electrode in aqueous 6 M KOH electrolyte is reported. This CoAl-LDH/GF//AEG cell achieved a specific capacitance of 101.4 F g -1 at a current density of 0.5 A g -1 with a maximum energy density as high as 28 Wh kg -1 and a power density of 1420 W kg -1 . Furthermore, the supercapacitor also exhibited an excellent cycling stability with ∼ 100% capacitance retention after 5000 charging-discharging cycles at a current density of 2 Ag -1 . The results obtained show the potential use of the CoAl-LDH/GF//AEG material as suitable electrode for enhanced energy storage as supercapacitor.

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Superior Performance Asymmetric Supercapacitors Based on Flake-like Co/Al Hydrotalcite and Graphene

Cited by 25 publications

References 45 publications

Hydrothermally Tailored Three-Dimensional Ni–V Layered Double Hydroxide Nanosheets as High-Performance Hybrid Supercapacitor Applications

Hydrothermally Tailored Three-Dimensional Ni–V Layered Double Hydroxide Nanosheets as High-Performance Hybrid Supercapacitor Applications

Large Scale Synthesis of NiCo Layered Double Hydroxides for Superior Asymmetric Electrochemical Capacitor

High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

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