Growth of Ni–Co binary hydroxide on a reduced graphene oxide surface by a successive ionic layer adsorption and reaction (SILAR) method for high performance asymmetric supercapacitor electrodes

Jana, Milan; Saha, Sanjit; Samanta, Pranab; Murmu, Naresh Chandra; Kim, Nam Hoon; Kuila, Tapas; Lee, Joong Hee

doi:10.1039/c5ta10297a

Cited by 95 publications

(49 citation statements)

References 57 publications

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“…The supercapacitors with a high energy density are urgently required to meet its practical application. It is believed that configuring asymmetric supercapacitors is one of the efficient strategies for realizing this process due to the expanded voltage window . In the present work, an asymmetric supercapacitor was assembled by using the as‐prepared LDH‐NF@VG hybrids with the Ni:Mn feeding mole ratio of 3:1 as the positive electrode, AC as the negative electrode, and 6 m KOH as the electrolyte.…”

Section: Resultsmentioning

confidence: 99%

High‐Stacking‐Density, Superior‐Roughness LDH Bridged with Vertically Aligned Graphene for High‐Performance Asymmetric Supercapacitors

Guo

et al. 2017

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The high-performance electrode materials with tuned surface and interface structure and functionalities are highly demanded for advanced supercapacitors. A novel strategy is presented to conFigure high-stacking-density, superior-roughness nickel manganese layered double hydroxide (LDH) bridged by vertically aligned graphene (VG) with nickel foam (NF) as the conductive collector, yielding the LDH-NF@VG hybrids for asymmetric supercapacitors. The VG nanosheets provide numerous electron transfer channels for quick redox reactions, and well-developed open structure for fast mass transport. Moreover, the high-stacking-density LDH grown and assembled on VG nanosheets result in a superior hydrophilicity derived from the tuned nano/microstructures, especially microroughness. Such a high stacking density with abundant active sites and superior wettability can be easily accessed by aqueous electrolytes. Benefitting from the above features, the LDH-NF@VG can deliver a high capacitance of 2920 F g at a current density of 2 A g , and the asymmetric supercapacitor with the LDH-NF@VG as positive electrode and activated carbon as negative electrode can deliver a high energy density of 56.8 Wh kg at a power density of 260 W kg , with a high specific capacitance retention rate of 87% even after 10 000 cycles.

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Section: Resultsmentioning

confidence: 99%

High‐Stacking‐Density, Superior‐Roughness LDH Bridged with Vertically Aligned Graphene for High‐Performance Asymmetric Supercapacitors

Guo

et al. 2017

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“…In addition, a porous structure (Figure g) is also found, which is beneficial for electrolyte penetration. Furthermore, the selected area electron diffraction (SAED) pattern in the inset of Figure g exhibits diffraction rings indicating low crystallinity and polycrystalline nature of NiCo LDH, whereas the spotty rings reveal a large number of randomly oriented grains…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the material presents a pore size distribution in the range of 4–25 nm (inset in Figure b). This mesoporous character resulted in enhanced accessibility to the active species and/or shortening of the pathway to the active sites during the charge–discharge process of NiCo LDH . The textural parameters, including specific surface area, pore volume, and pore diameter, are displayed in Table S2, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Flexible and Mechanically Durable Asymmetric Supercapacitor Based on NiCo‐Layered Double Hydroxide and Nitrogen‐Doped Graphene Using a Simple Fabrication Method

et al. 2019

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A high‐performing, lightweight, and flexible asymmetric supercapacitor (ASC) using NiCo‐layered double hydroxide (NiCo LDH) supported on 3D nitrogen‐doped graphene (NG) as a positive electrode and NG as a negative electrode is demonstrated. Highly conductive NG provides fast electron transfer and facilitates (dis)charging of NiCo LDH deposited on it. The composite electrode of NiCo LDH@NG exhibits a high specific capacitance of 1421 F g−1 at 2 A g−1. Moreover, the as‐obtained hybrid electrode shows an excellent rate capability with a specific capacitance of 1397 F g−1 at a high current density of 10 A g−1, which is about 98% of the capacitance obtained at 2 A g−1. The flexible ASC device shows a specific capacitance of 109 F g−1 at 0.5 A g−1 and a maximum energy density of 49 W h kg−1, which is comparable with or superior to previously reported electrodes based on nickel‐cobalt hydroxides. Furthermore, an excellent mechanical stability is obtained. Under repeated mechanical bendings, the ASC demonstrates high bending stability up to 450 bending cycles at a 90° angle. Hence, this flexible NiCo LDH@NG electrode that is free of binders and conductive agents shows superior performance and stability, and is a promising candidate for the future wearable energy storage devices.

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“…Therefore, this hypothesis about the favorable formation of graphene on metal hydroxides seems to be very interesting and merits to be investigated more thoroughly. Moreover, the growth of graphene on metal hydroxides could be exploited in the production of layered structures and nanocomposite materials for very promising application in energy storage devices …”

Section: Resultsmentioning

confidence: 99%

Growth and characterization of ultrathin carbon films on electrodeposited Cu and Ni

Pedrazzetti

Nobili

Magagnin

et al. 2017

Surface & Interface Analysis

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Ultrathin carbon films were grown on different types of metallic substrates. Free‐standing foils of Cu and Ni were prepared by electroforming, and a pure Ni film was obtained by galvanic displacement on a Si wafer. Commercial foil of Ni 99.95% was used as a reference substrate. Carbon films were grown on these substrates by chemical vapour deposition in a CH4‐H2 atmosphere. Obtained films were characterized by Raman spectroscopy, X‐ray photoelectron spectroscopy (XPS), Auger electron spectroscopy, and ultraviolet photoemission spectroscopy. The XPS at grazing collection angle was used to determine the thickness of carbon films. Depending on the deposition parameters, the films of graphene or graphite were obtained on the different substrates. The uniformity of graphene and its distribution over the sample area were investigated from Raman data, optical images, and XPS chemical maps. The presence of graphene or graphite in the films was determined from the Raman spectra and Auger peak of C KVV. For this purpose, the D parameter, which is a fingerprint of carbon allotropes, was determined from C KVV spectra acquired by using X‐rays and electron beam. A formation of an intermediate layer of metal hydroxide was revealed in the samples with graphene overlayer.

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Growth of Ni–Co binary hydroxide on a reduced graphene oxide surface by a successive ionic layer adsorption and reaction (SILAR) method for high performance asymmetric supercapacitor electrodes

Abstract: Ni–Co–BH–G was prepared by using a SILAR technique and the corresponding asymmetric supercapacitor showed an energy density of 92 W h kg−1.

Cited by 95 publications

References 57 publications

High‐Stacking‐Density, Superior‐Roughness LDH Bridged with Vertically Aligned Graphene for High‐Performance Asymmetric Supercapacitors

High‐Stacking‐Density, Superior‐Roughness LDH Bridged with Vertically Aligned Graphene for High‐Performance Asymmetric Supercapacitors

Flexible and Mechanically Durable Asymmetric Supercapacitor Based on NiCo‐Layered Double Hydroxide and Nitrogen‐Doped Graphene Using a Simple Fabrication Method

Growth and characterization of ultrathin carbon films on electrodeposited Cu and Ni

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