Embedded coral reef sponge like structured Al(OH)3/FeOOH composite for flexible solid-state symmetric supercapacitor

Parveen, Shama; Kavyashree,; Pandey, S. N.

doi:10.1016/j.jpowsour.2019.227304

Cited by 35 publications

(16 citation statements)

References 64 publications

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“…The GCD curves at different current densities (Figure (c)) further validate the combined EDLC and pseudocapacitance contribution of the device resulting from the nonlinear discharge curves in the higher potential range. The discharge curves of the ASC have three regions (mentioned in Figure (c)): (i) a sudden drop of the initial potential due to the internal resistance (IR drop); (ii) a linear deviation of the time dependence of the potential as the result of the EDLC behavior and (iii) the plateaulike flat region corresponding to the faradaic redox reaction at the electrode/electrolyte interface, which indicates the batterylike features. , Thus, the discharge profile of the ASC proves the existence of both EDLC and batterylike redox characteristics. The specific capacitance of the device was calculated to be 153.8, 108.1, 99.0, 88.6, 84.3, 80.7, 75.6, and 72.6 F g –1 at the current densities of 1, 2, 4, 6, 8, 10, 12, and 16 A g –1 , respectively, as illustrated in Figure (d).…”

Section: Resultsmentioning

confidence: 87%

Construction of NiCo-Layered Double Hydroxide Microspheres from Ni-MOFs for High-Performance Asymmetric Supercapacitors

Ramachandran

Lan

et al. 2020

ACS Appl. Energy Mater.

219

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Layered double hydroxide (LDH) materials, especially metal–organic framework (MOF)-derived LDHs, have attracted much attention in electrochemical capacitor applications. However, the construction of porous three-dimensional microsphere architectures with controlled morphology is highly demanded for high-performance supercapacitor electrodes. Thus, a simple and effective strategy is recommended to design and fabricate the well-defined layered structure of LDHs with high performance. In this study, we demonstrate the synthesis of nickel–cobalt-LDHs (NiCo-LDHs) by in-situ etching of the Ni-MOF template at different hydrolysis times. Based on the different characterization results of the sample, a formation mechanism has been proposed in terms of the proton production rate and etching process. As a result of the disparity in the layered structure and the surface area, the electrochemical behavior of the NiCo-LDHs has been altered. The sample NiCo-LDH/10 (prepared after the 10 h reaction) exhibited a high surface area and the large size of LDH sheets on microspheres, which promoted the rapid electrolyte ion transportation for supercapacitors and displayed a maximum specific capacity of 1272 C g–1 at 2 A g–1. In addition, the assembled asymmetric supercapacitor delivered a remarkable energy density of 36.1 Wh kg–1 with an outstanding cyclic stability (103.9% after 5000 cycles). This work establishes an effective strategy to synthesize a well-defined NiCo-LDH structure from the MOF template toward high-performance asymmetric supercapacitors, which could be extended to large-scale preparation of other transition metal-based LDHs from Ni-MOFs.

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Section: Resultsmentioning

confidence: 87%

Construction of NiCo-Layered Double Hydroxide Microspheres from Ni-MOFs for High-Performance Asymmetric Supercapacitors

Ramachandran

Lan

et al. 2020

ACS Appl. Energy Mater.

219

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“…The peaks at 68.72 and 74.48 eV are attributed to the 2p 3/2 and 2p 1/2 spin states of Al(III) for LDHs, respectively . The peak at about 73.45 eV can be assigned to Al(III) for Al(OH) 3 . According to the mole ratio of Ni/Al (2.92:1) and the peak areas of Al in NiAl-LDHs and Al(OH) 3 (6:1), the mole ratio of Ni to Al in NiAl-LDHs was 3.4:1.…”

Section: Resultsmentioning

confidence: 48%

“… 34 The peak at about 73.45 eV can be assigned to Al(III) for Al(OH) 3 . 35 According to the mole ratio of Ni/Al (2.92:1) and the peak areas of Al in NiAl-LDHs and Al(OH) 3 (6:1), the mole ratio of Ni to Al in NiAl-LDHs was 3.4:1. Generally, the mole ratio of M(II) to M (III) is between 4:1 and 2:1 to form an M(II)M(III)-LDHs structure.…”

Section: Resultsmentioning

confidence: 97%

Study on Simultaneous Removal of Dye and Heavy Metal Ions by NiAl-Layered Double Hydroxide Films

et al. 2020

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Herein, nickel-aluminum-layered double hydroxide (NiAl-LDH) films were prepared by the hydrothermal method. Based on the photoinduced reduction ability and degradation of LDHs on heavy metal ions and organic compounds, NiAl-LDH films displayed favorable simultaneous removal performance. Benefiting from the electron traps of heavy metals reduced from solution, the coexisting metal ions improved the photocatalytic activity of NiAl-LDH films on methyl orange. The higher the Fermi level of coexisting metal ion was, the higher the photocatalytic degradation rate of methyl orange obtained. Meanwhile, the removal rates of heavy metal ions (Ag + , Pb 2+ , and Cu 2+ ) from wastewater were both enhanced and could reach 95%. NiAl-LDH films showed affinity toward Ag + . Furthermore, NiAl-LDH films are tightly coupled with the substrate, providing active sites and a simple method for the catalyst recovery. This study provides new insights into the simultaneous removal of heavy metal ions and organic pollutants using LDH films.

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“…The XPS characteristic peaks of Fe 2p locate at 724.0 and 710.5 eV, respectively, corresponding to Fe 2p 1/2 and Fe 2p 3/2 , respectively . This result illustrates the chemical valence of iron is Fe 3+ . The two peaks at 528.5 and 530.1 eV are assigned to the chemical bond of Fe–O and Fe–OH, likely suggesting the presence of FeOOH. , Meanwhile, the other peaks at 531.3 and 532.4 eV represent the chemical bond of C–OH and CO, implying the PP separator may be oxidized .…”

Section: Resultsmentioning

confidence: 80%

“…This result illustrates the chemical valence of iron is Fe 3+ . The two peaks at 528.5 and 530.1 eV are assigned to the chemical bond of Fe–O and Fe–OH, likely suggesting the presence of FeOOH. , Meanwhile, the other peaks at 531.3 and 532.4 eV represent the chemical bond of C–OH and CO, implying the PP separator may be oxidized . Furthermore, the C 1s of the PP@FeOOH separator exhibits three peaks at 284.6 eV, corresponding to the C–C bond in the PP substrate, at 286.3 eV, representing the C–OH bond and at 288.4 eV, corresponding to the bond of CO …”

Section: Resultsmentioning

confidence: 85%

Suppressing the Shuttling of Polysulfide by a Self-Assembled FeOOH Separator in Li–S Batteries

Wang

Yang

Chen

et al. 2020

Ind. Eng. Chem. Res.

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Fabrication of a functional separator with physical methods such as slurry casting and vacuum filtration method is a common way to capture the dissolved polysulfide and suppress its shuttling in lithium−sulfur batteries (Li−S battery). However, most of the layers are covered on the PP separator by weak physical adhesion, and it is hard to guarantee stability during longterm cycling at high rates. Therefore, we take advantage of the strong oxidization of acidic ferrate solution and design a novel simple chemical method to tightly assemble a thin and light FeOOH layer on the PP substrate by itself. The PP@FeOOH separator can chemically immobilize the polysulfide and efficiently prohibit the shuttling. Therefore, the long-term stability of the Li−S cell is extraordinarily enhanced with this self-assembled PP@ FeOOH separator. After discharging and charging for 400 cycles at 0.5 C, cycling fading is only 0.075% per cycle. This novel chemical method not only simplifies the fabrication and improves the stability of the modified layer on the PP substrate, but also offers an effective and prospective way to modify the separator with metal oxides in Li−S batteries.

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Embedded coral reef sponge like structured Al(OH)3/FeOOH composite for flexible solid-state symmetric supercapacitor

Cited by 35 publications

References 64 publications

Construction of NiCo-Layered Double Hydroxide Microspheres from Ni-MOFs for High-Performance Asymmetric Supercapacitors

Construction of NiCo-Layered Double Hydroxide Microspheres from Ni-MOFs for High-Performance Asymmetric Supercapacitors

Study on Simultaneous Removal of Dye and Heavy Metal Ions by NiAl-Layered Double Hydroxide Films

Suppressing the Shuttling of Polysulfide by a Self-Assembled FeOOH Separator in Li–S Batteries

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