Efficient NiO/RGO combination for high-cycling-stability supercapacitors by an alkaline hydrothermal strategy

Gao, Jiangshan; Lian, Tongtong; Liu, Zhiming; He, Yan

doi:10.1007/s10800-022-01694-x

Cited by 4 publications

(3 citation statements)

References 42 publications

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“…Moreover, the TrGO-supported Co nanoparticles show peaks around 467, 511, and 672 cm –1 attributed to the F m 12 , F g 22 , and A 1g active modes of Co 3 O 4 . , In addition, TrGO-immobilized Ni nanoparticles exhibit Raman bands situated at ∼515 and 618 cm –1 ascribed to the A 2u (T) lattice vibration of the NiO nanoparticles on the reduced graphene oxide surface. This proves the successful immobilization of metallic NPs on the TrGO surface. − …”

Section: Resultsmentioning

confidence: 59%

Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites

et al. 2023

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Core–shell magnetic air-stable nanoparticles have attracted increasing interest in recent years. Attaining a satisfactory distribution of magnetic nanoparticles (MNPs) in polymeric matrices is difficult due to magnetically induced aggregation, and supporting the MNPs on a nonmagnetic core–shell is a well-established strategy. In order to obtain magnetically active polypropylene (PP) nanocomposites by melt mixing, the thermal reduction of graphene oxides (TrGO) at two different temperatures (600 and 1000 °C) was carried out, and, subsequently, metallic nanoparticles (Co or Ni) were dispersed on them. The XRD patterns of the nanoparticles show the characteristic peaks of the graphene, Co, and Ni nanoparticles, where the estimated sizes of Ni and Co were 3.59 and 4.25 nm, respectively. The Raman spectroscopy presents typical D and G bands of graphene materials as well as the corresponding peaks of Ni and Co nanoparticles. Elemental and surface area studies show that the carbon content and surface area increase with thermal reduction, as expected, following a reduction in the surface area by the support of MNPs. Atomic absorption spectroscopy demonstrates about 9–12 wt % metallic nanoparticles supported on the TrGO surface, showing that the reduction of GO at two different temperatures has no significant effect on the support of metallic nanoparticles. Fourier transform infrared (FT-IR) spectroscopy shows that the addition of a filler does not alter the chemical structure of the polymer. Scanning electron microscopy of the fracture interface of the samples demonstrates consistent dispersion of the filler in the polymer. The TGA analysis shows that, with the incorporation of the filler, the initial (T onset) and maximum (T max) degradation temperatures of the PP nanocomposites increase up to 34 and 19 °C, respectively. The DSC results present an improvement in the crystallization temperature and percent crystallinity. The filler addition slightly enhances the elastic modulus of the nanocomposites. The results of the water contact angle confirm that the prepared nanocomposites are hydrophilic. Importantly, the diamagnetic matrix is transformed into a ferromagnetic one with the addition of the magnetic filler.

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Section: Resultsmentioning

confidence: 59%

Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites

et al. 2023

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“…Many studies revealed the excellent properties of NiO/rGO composites, but the crucial of exploiting the synergetic enhancement of both materials is the selection of an appropriate structure/bonding method [23][24][25]. Nowadays, most of the preparations of NiO/rGO composites are generally time-consuming or have complex preparation processes.…”

Section: Introductionmentioning

confidence: 99%

Optimized 3D interconnected foam-like NiO@rGO composite as a binder-free electrode for high-performance asymmetric supercapacitor

Liu,

Shao,

Xue

et al. 2023

Mater. Res. Express

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Bonding of transition metal oxides and highly conductive carbon materials to exploit the synergistic effect of both materials has been proven to be an efficient means to develop high-capacity electrode materials. A unique interconnected foam-like NiO@rGO structure was constructed by loading the NiO nanoparticles onto rGO frameworks as a binder-free supercapacitor electrode via three steps including hydrothermal reaction, electrodeposition and heating treatment. The morphology and crystallinity were tuned by controlling the electrodeposition time and heating temperature, and the electrochemical properties of the NiO@rGO composites were systematically investigated. The optimized NiO@rGO-250 composite showed excellent electrochemical properties (1399 F g-1 at 1 A g-1) and superior cycling stability. Furthermore, an asymmetric supercapacitor using NiO@rGO and active carbon as two electrodes achieved a high specific energy of 40.4 Wh k g-1 at a specific power of 750 W k g-1.

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“…Thus, it is important to develop NiO-based nanocomposites to enhance the capacitive behavior by increasing active sites, electrical conductivity, and the interaction between the electrode and electrolyte interface [38,39]. In this context, Gao et al showed NiO/RGO nanocomposite with a specific capacitance of 68.9 mAh/g at 1 A/g in a 6.0 M KOH electrolyte [40]. Ashok et al recently disclosed coincorporated NiO nanomaterial which exhibits a specific capacitance of 156 C/g at 0.5 A/g in 3.0 M KOH electrolyte [41].…”

Section: Introductionmentioning

confidence: 99%

Facile Solvothermal Synthesis of NiO/g-C3N4 Nanocomposite for Enhanced Supercapacitor Application

Pai

Sasmal

Nayak

et al. 2023

International Journal of Energy Research

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There is a desperate demand for efficient energy storage systems to fulfill future energy demands. Herein, we exemplify a facile solvothermal approach followed by heat treatment to synthesize NiO/g-C3N4 nanocomposites for enhanced supercapacitor applications. The molar ratio of g-C3N4 is varied to achieve numerous nanostructures like nanoparticles and nanorods with optimum specific capacitance. Further, all as-prepared electrode materials are examined for supercapacitor application. The electrochemical behavior of prepared NiO/g-C3N4 nanocomposites is carried out under cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in a three-electrode cell under different electrolytes such as aqueous sodium sulphate electrolyte (1.0 M Na2SO4) and potassium hydroxide electrolyte (3.0 M KOH). Among all the electrode materials, NO-4 (1 : 2) shows the highest specific capacitance of 338.68 F/g at a scan rate of 2 mV/s and 161.3 F/g at a current density of 1 A/g in 1.0 M Na2SO4 electrolyte. Also, this electrode material shows 95.22 F/g at a scan rate of 2 mV/s in 3.0 M KOH electrolyte. The excessive specific capacitance of this electrode material is due to retarded charge transfer resistance in the interface at the electrode and electrolyte and a increased number of active sites. The investigation of the electrokinetics of all the prepared electrodes was also carried out, and it revealed the charge storage contribution of capacitive and diffusive parts which levitates the higher specific capacitance. The two-electrode study for evaluating supercapacitor performance is studied. The NO-4//NO-4 SSD in 1.0 M Na2SO4 electrolyte shows 18.23 F/g at a specific capacitance of 1 A/g with a corresponding energy density of 10.13 Wh/kg and a power density of 1.01 kW/kg, respectively.

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Efficient NiO/RGO combination for high-cycling-stability supercapacitors by an alkaline hydrothermal strategy

Cited by 4 publications

References 42 publications

Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites

Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites

Optimized 3D interconnected foam-like NiO@rGO composite as a binder-free electrode for high-performance asymmetric supercapacitor

Facile Solvothermal Synthesis of NiO/g-C3N4 Nanocomposite for Enhanced Supercapacitor Application

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