2D-2D nanohybrids of Ni–Cr-layered double hydroxide and graphene oxide nanosheets: Electrode for hybrid asymmetric supercapacitors

Padalkar, Navnath S.; Sadavar, Shrikant V.; Patil, Akash S.; Patil, Umakant M.; Magdum, Vikas V.; Chitare, Yogesh M.; Kulkarni, Shirin P.; Bulakhe, Ravindra N.; Gunjakar, Jayavant L.

doi:10.1016/j.electacta.2022.140615

Cited by 20 publications

(10 citation statements)

References 66 publications

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“…This weakening of the Raman band suggests the leaching of Cr from the catalyst surface during the activation process. The well-defined Raman bands at 477 and 557 cm –1 are attributed to the E g Ni–O bending mode and the A 1g Ni–O stretching vibration of NiOOH, respectively . The characteristic Raman peak of NiOOH appeared and intensified during the activation.…”

Section: Resultsmentioning

confidence: 97%

“…The well-defined Raman bands at 477 and 557 cm −1 are attributed to the E g Ni−O bending mode and the A 1g Ni−O stretching vibration of NiOOH, respectively. 27 The characteristic Raman peak of NiOOH appeared and intensified during the activation. Further, in situ Raman spectroscopy was performed on NiCrO-V Cr,O in a 1 M KOH solution containing 0.1 M glycerol (Figure 4a).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Vacancy Optimized Coordination on Nickel Oxide for Selective Electrocatalytic Oxidation of Glycerol

Xia,

Ma,

Fan

et al. 2024

ACS Catal.

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The production of high-value-added organics by the glycerol oxidation reaction (GOR) holds significant research importance for addressing the surplus production of glycerol and mitigating the energy crisis. In this study, we report a vacancy optimized coordination on nickel oxide for the selective electrocatalytic oxidation of glycerol. Using in situ Raman and electron paramagnetic resonance spectroscopy, the formation of vacancies was traced during the cationic leaching process. Subsequently, in situ attenuated total reflection surface-enhanced IR absorption spectroscopy and density functional theory calculations revealed a significantly enhanced adsorption capacity and optimized coadsorption process of OH − and organics. Consequently, NiCrO with vacancies (NiCrO-V Cr,O ) exhibited GOR performance with conversion, formic acid selectivity, and faradaic efficiency values of 99%, 98%, and 96%, respectively. Notably, the conversion and selectivity in the flow electrolyzer remained above 90% during long-time continuous electrolysis, highlighting its industrial applicability. This study provides constructive guidance for the design of electrocatalysts, the optimization of the catalyst ligand environment, and the development of high-performance, metal-based catalysts for glycerol electrooxidation.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Vacancy Optimized Coordination on Nickel Oxide for Selective Electrocatalytic Oxidation of Glycerol

Xia,

Ma,

Fan

et al. 2024

ACS Catal.

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“…The D band originates from sp 3 vibrations of defective and disordered carbon atoms, and the G band can be attributed to the sp 2 vibration of carbon atoms in a 2D hexagonal lattice. [37][38][39] In the spectrum of PEDOT:PSS, the main peaks at 437, 676, 575 and 988, 1108, 1256, 1424, 1503, and 1553 cm -1 can be ascribed to SO 2 bending, symmetric C − S − C deformation, oxyethylene ring deformation, C − O − C deformation, C − C interring stretching, C = C symmetrical stretching, C=C asymmetrical stretching, and C = C antisymmetrical stretching, respectively. [40,41] However, the intensity of the peak of PSS is weak, because a part of PSS is carried away by the solvent during the preparation process.…”

Section: Resultsmentioning

confidence: 99%

Ultralong-Cycling and Free-Standing Carboxylated Graphene/PEDOT:PSS Films as Electrode for Flexible Supercapacitors

et al. 2023

International Journal of Energy Research

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The rapid development of current wearable electronics motivates the promotion of energy storage devices. Supercapacitor with flexible, lightweight, highly efficient, and long cycling life is one of the potential and glittering candidates. Here, the composite film of carboxylated graphene (CG) and commercially available poly (3, 4-ethylene dioxythiophene): poly (styrene sulfonate) (PEDOT:PSS) are prepared as electrodes for flexible electrochemical capacitors by ultrasonication and vacuum filtration. The CG/PEDOT:PSS films were roundly characterized by SEM, XPS, FTIR, XRD and Raman spectrometer. The as-prepared free-standing films exhibited high specific capacitance (192.7 F g-1 at 0.5 A g-1), excellent rate capability (up to 80.4% from 0.5 to 20 A g-1), and good electrochemical stability (95.5% of specific capacitance retention after 50000 cycles). Surprisingly, the post treated free-standing films by Dimethyl Formamide (DMF) shows better capacitive properties than those of the pristine electrode, such as higher specific capacitance (204.3 F g-1 at 0.5 A g-1), and ultralong-cycling stability (104.6% retention at a high current density of 20 A g-1 after 50000 cycles). It is expected that the free-standing CG/PEDOT:PSS films can be used as flexible electrodes for various wearable energy storage devices.

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“…Different methods require different conditions, and the structure and the morphology of the synthesized materials also differ, but ultimately, they all aim to synthesize materials with better properties. 120…”

Section: Preparation Methodsmentioning

confidence: 99%

Progress of layered double hydroxide-based materials for supercapacitors

Ren

Sridhar³

et al. 2023

Mater. Chem. Front.

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2D-2D nanohybrids of Ni–Cr-layered double hydroxide and graphene oxide nanosheets: Electrode for hybrid asymmetric supercapacitors

Cited by 20 publications

References 66 publications

Vacancy Optimized Coordination on Nickel Oxide for Selective Electrocatalytic Oxidation of Glycerol

Vacancy Optimized Coordination on Nickel Oxide for Selective Electrocatalytic Oxidation of Glycerol

Ultralong-Cycling and Free-Standing Carboxylated Graphene/PEDOT:PSS Films as Electrode for Flexible Supercapacitors

Progress of layered double hydroxide-based materials for supercapacitors

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