Simultaneous electrochemical deposition of nickel cobalt oxide-reduced graphene oxide composites for high performance asymmetric supercapacitors

Budak, Özlem; Uğuz, Özlem; Koca, Atıf

doi:10.1016/j.est.2021.103538

Cited by 16 publications

(6 citation statements)

References 92 publications

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“…The NiCo LDH pattern is in accordance with the standard cards JCPDS 00-022-0444 and 01-074-1057 for hexagonal crystals of nickel(II) hydroxide and cobalt(II) hydroxide, respectively. The peaks appeared at 11,22,33,35,38,60, and 61°are related to the (001), ( 002), ( 110), ( 111), ( 200), (300), and (311) planes of Ni(OH) 2 crystal lattice and those at 19, 37, 39, 51, 60, 70, and 72°are dedicated to the (001), ( 011), ( 002), ( 012), ( 003), (103), and (112) planes of Co(OH) 2 , respectively. The same peaks are observed in the patterns of rGO/NiCo LDH and TMOs/rGO/NiCo LDH.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast graphene, among all carbon materials, has been recognized as a potential electrode material for SCs due to its excellent conductivity, mechanical flexibility, and exceptionally large specific surface area. Therefore, the combination of graphene and NiCo LDH for SCs has drawn significant interest recently. , For example, Jiang et al successfully prepared a Ni-CoLDH/rGO electrode material, which retained 73.5% of initial capacitance after 5000 consecutive charge–discharge tests at 10 A g –1 …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the combination of graphene and NiCo LDH for SCs has drawn significant interest recently. 32,33 For example, Jiang et al successfully prepared a Ni-CoLDH/rGO electrode material, which retained 73.5% of initial capacitance after 5000 consecutive charge−discharge tests at 10 A g −1 . 34 In this work, a binder-free NF/TMOs/rGO/NiCo LDH electrode was prepared by a simple two-step procedure, i.e., electrochemical and coprecipitation, and was further evaluated for supercapacitor application in a KOH solution.…”

Section: Introductionmentioning

confidence: 99%

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Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

et al. 2023

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Layered double hydroxides (LDHs) of transition metals have attained significant attention for supercapacitor applications due to their excellent charge storage, low internal resistance, and superior electrochemical stability. Here, a nanocomposite of reduced graphene oxide/nickel cobalt layered double hydroxide (rGO/NiCo LDH) on the surface of nickel foam (NF) containing hierarchical nickel cobalt copper transition metal oxides (TMOs) is prepared through two-step processes of electrochemical and coprecipitation methods. The TMOs/rGO/NiCo LDH nanocomposite is characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman, X-ray energy-dispersive (EDS), and X-ray photoelectron (XPS) spectroscopies as well as by transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM), elemental mapping analysis, nitrogen adsorption/desorption, and contact angle measurements. The supercapacitive behavior of the electrodes has been investigated through cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) measurements, and electrochemical impedance spectroscopy (EIS). The study has shown that the synergetic effect and the electrochemical properties have considerably improved when the layered double hydroxides are synthesized in the presence of rGO. The TMOs/rGO/NiCo LDH nanocomposite exhibits an excellent specific capacitance of 2763 F g–1 at a current density of 1 A g–1 and a stability of 85% after 3000 GCD cycles at a current density of 24 A g–1. Also, a TMOs/rGO/NiCo LDH//rGO asymmetric supercapacitor device is constructed with an aqueous KOH electrolyte, which shows a capacitance of 244 F g–1 at a current density of 1 A g–1. The device attains the highest energy density of 34 Wh kg–1 and power density of 2500 W kg–1, with an excellent cycling stability of 100% after 3000 GCD cycles at a current density of 10 A g–1.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

et al. 2023

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“…The Raman spectroscopy (Figure S5) shows several characteristic peaks. The peak at ∼517 cm −1 arises from the vibrational mode of Ni−O, while those in the range of ∼550−800 cm −1 stem from S. 40 The two strong signals present in larger wavenumbers are indexed to the fingerprint peaks of carbon, involving a disorder-induced D band (1341 cm −1 ) and an in-plane vibrational G band (1592 cm −1 ). 41 After S infusion into the hosts, S@C/NiO films are then packaged by thin NNH layers (SEM and XRD detections in Figures 4d and S3).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

High S Filling and Binder-Free Cathodes Enabled by Thick Arrayed Nanoframeworks and Subtle Interfacial Engineering

Liu

Sun

Zhang

et al. 2022

ACS Appl. Energy Mater.

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Besides tough kinetic issues in S cathodes, a poor S filling ratio, and a low compact density in films led by the overuse of porous hosts, conducting agents or other additives impede the further progress of Li−S cells. To overcome these constraints, we herein propose the rational design of robust NiO nanoframeworks to make high S filling and binder-free cathodes. Notably, such arrayed thick frameworks have an impressive spatial filling ability, showing a remarkable S filling ratio of 77.6%. To further optimize the cell behaviors, all of the arrayed NiO matrix surface is evenly paved by graphitic carbon shells, and the open-up architecture for S-filled frameworks is intactly encapsulated by functionalized nickel nitrate hydroxide layers. Thanks to subtle interfacial engineering and smart hybrid configurations, a high initial discharge capacity of over 1481 mAh g −1 and a longer-term cyclic lifespan are achieved at 0.1 C. Also, this optimized binder-free cathode leads to great improvements in Coulumbic efficiency, the S utilization ratio, and rate capabilities. Our work presents not only an appealing route to making high S filling and binder-free cathodes for Li−S cells but also insight for the smart design of integrated film electrodes for other electrochemical applications.

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“…the deposition temperature, deposition time, concentration of metal ions, annealing temperature, addition of surfactant and other conditions. 61 Budak et al 62 prepared nickel cobalt oxide reduced graphene oxide (NCO-rGO) materials by adjusting scanning cycle numbers (5, 10 and 15 cycles, respectively) in the electrodeposition and annealing process. The NCO(2 : 1)-10-rGO-0.25 electrode prepared using 10 cycles presented interconnected wrinkled vertical nanosheets, resulting in a porous network structure which could cause large open space and electroactive sites (Fig.…”

Section: Electrodeposition Methodsmentioning

confidence: 99%

Activity engineering of cobalt-based oxide materials for high performance supercapacitors: from morphology regulation to structural optimization

Wang

Chen

et al. 2022

Sustainable Energy Fuels

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Simultaneous electrochemical deposition of nickel cobalt oxide-reduced graphene oxide composites for high performance asymmetric supercapacitors

Cited by 16 publications

References 92 publications

Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

High S Filling and Binder-Free Cathodes Enabled by Thick Arrayed Nanoframeworks and Subtle Interfacial Engineering

Activity engineering of cobalt-based oxide materials for high performance supercapacitors: from morphology regulation to structural optimization

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