Synthesis, characterization, and performance of nanocomposites containing reduced graphene oxide, polyaniline, and cobalt ferrite

Kooti, M.; Sedeh, A. Naghdi; Gheisari, Kh.; Figuerola, Albert

doi:10.1016/j.physb.2021.412974

Cited by 28 publications

(12 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the peak at 778.0 eV is attributed to metallic cobalt. Satellite peaks at 789.2 and 803.9 eV for Co 3 O 4 were shifted to 785.5 eV and 801.9 eV for Co 3 O 4 @Co. , Figure e shows the presence of O 1s in Co 3 O 4 and rGO as indicated by the binding energies of 528.4, 530.2, and 531.1 eV . These energies are attributed to oxygen present in Co 3 O 4 , -OH functional groups on the surface, and the rest of the oxygen-containing groups in rGO, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Satellite peaks at 789.2 and 803.9 eV for Co 3 O 4 were shifted to 785.5 eV and 801.9 eV for Co 3 O 4 @Co. 61,62 Figure 5e shows the presence of O 1s in Co 3 O 4 and rGO as indicated by the binding energies of 528.4, 530.2, and 531.1 eV. 63 These energies are attributed to oxygen present in Co 3 O 4 , -OH functional groups on the surface, and the rest of the oxygen-containing groups in rGO, respectively. As shown in Figure 5f, binding energies of 398.1, 399.4, and 401.2 eV are ascribed to pyridine, pyrrolic, and graphitic N 1s.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Square-Facet Nanobar MOF-Derived Co₃O₄@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies

et al. 2023

View full text Add to dashboard Cite

The binary as well as ternary nanocomposites of the square-facet nanobar Co-MOF-derived Co3O4@Co/N-CNTs (N-CNTs: nitrogen-doped carbon nanotubes) with Ag NPs and rGO have been synthesized via an easy wet chemical route, and their supercapacitor behavior was then studied. At a controlled pH of the precursor solution, square-facet nanobars of Co-MOF were first synthesized by the solvothermal method and then pyrolyzed under a controlled nitrogen atmosphere to get a core–shell system of Co3O4@Co/N-CNTs. In the second step, different compositions of Co3O4@Co/N-CNT core–shell structures were formed by an ex-situ method with Ag NPs and rGO moieties. Among several bare, binary, and ternary compositions tested in 6 M aqueous KOH electrolyte, a ternary nanocomposite having a 7.0:1.5:1.5 stoichiometric ratio of Co3O4@Co/N-CNT, Ag NPs, and rGO, respectively, reported the highest specific capacitance (3393.8 F g–1 at 5 mV s–1). The optimized nanocomposite showed the energy density, power density, and Coulombic efficiency of 74.1 W h.kg–1, 443.7 W.kg–1, and 101.3%, respectively, with excellent electrochemical stability. After testing an asymmetrical supercapacitor with a Co3O4@Co/N-CNT/Ag NPs/rGO/nickel foam cathode and an activated carbon/nickel foam anode, it showed 4.9 W h.kg–1 of energy density and 5000.0 W.kg–1 of power density.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Square-Facet Nanobar MOF-Derived Co₃O₄@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Compared to graphite, cobalt ferrite has very small size so failed to detect diffraction pattern [5]. In CF/G/PANI electrode, the intensity of the graphite diffraction pattern is decreased because the coating of PANI decreases the crystallinity of graphite on the surface of the electrode [17]. From this result, we confirmed that PANI is uniformly coated on the surface of the modified electrode.…”

Section: Resultsmentioning

confidence: 66%

Electrochemical sensor based on PVP coated cobalt ferrite/graphite/PANI nanocomposite for the detection of hydrazine

Desai,

Sudhakar,

Patil

et al. 2023

Mater. Res. Express

View full text Add to dashboard Cite

In this study, we developed a multi-layered electrode as an efficient nanocomposite electrochemical sensor for detecting carcinogenic hydrazine in water. Nano-cobalt ferrite (CoFe2O4) was prepared using poly (vinylpyrrolidone) (PVP), mixed with an optimum quantity of graphite and pasted on a stainless-steel current collector. The nanocomposite was further hybridised by electrodepositing with polyaniline (PANI). The obtained composite was characterized using XRD, FTIR, SEM, and electrochemical techniques. XRD analysis shows the successful formation of composite from individual precursors. According to SEM, wrinkled and layered morphology for graphite and aggregate clusters for cobalt with spike or tubular structure for polyaniline were observed. When subjected to amperometry current, the prepared electrode showed different peaks for different concentrations of hydrazine, such as 1 μM to 100 μM. Cyclic voltammetry studies showed an increase in oxidation and reduction peaks. These studies will lead to a new platform for their potential applications in detecting toxic materials in real samples such as water, plastic bottle, water etc.,

show abstract

“…The presence of the plateau region and the ε ′ dispersion in the high-frequency range is associated with the Maxwell–Wagner polarization, which is characteristic of inhomogeneous samples, such as highly conductive particles covered with a resistive surface. The analysis of only the low-frequency region can allow observing that the polarization phenomenon in these nanoparticles is related to the interfacial polarization [ 34 ]. As the temperature rises, much more charge carriers accumulate on the surface of the particles, and this polarization is clearly visible.…”

Section: Resultsmentioning

confidence: 99%

Influence of Magnetite Nanoparticles Shape and Spontaneous Surface Oxidation on the Electron Transport Mechanism

et al. 2021

View full text Add to dashboard Cite

The spontaneous oxidation of a magnetite surface and shape design are major aspects of synthesizing various nanostructures with unique magnetic and electrical properties, catalytic activity, and biocompatibility. In this article, the roles of different organic modifiers on the shape and formation of an oxidized layer composed of maghemite were discussed and described in the context of magnetic and electrical properties. It was confirmed that Fe3O4 nanoparticles synthesized in the presence of triphenylphosphine could be characterized by cuboidal shape, a relatively low average particle size (9.6 ± 2.0 nm), and high saturation magnetization equal to 55.2 emu/g. Furthermore, it has been confirmed that low-frequency conductivity and dielectric properties are related to surface disordering and oxidation. The electric energy storage possibility increased for nanoparticles with a disordered and oxidized surface, whereas the dielectric losses in these particles were strongly related to their size. The cuboidal magnetite nanoparticles synthesized in the presence of triphenylphosphine had an ultrahigh electrical conductivity (1.02 × 10−4 S/cm at 10 Hz) in comparison to the spherical ones. At higher temperatures, the maghemite content altered the behavior of electrons. The electrical conductivity can be described by correlated barrier hopping or overlapping large polaron tunneling. Interestingly, the activation energies of electrons transport by the surface were similar for all the analyzed nanoparticles in low- and high-temperature ranges.

show abstract

Synthesis, characterization, and performance of nanocomposites containing reduced graphene oxide, polyaniline, and cobalt ferrite

Cited by 28 publications

References 73 publications

Square-Facet Nanobar MOF-Derived Co₃O₄@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies

Square-Facet Nanobar MOF-Derived Co₃O₄@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies

Electrochemical sensor based on PVP coated cobalt ferrite/graphite/PANI nanocomposite for the detection of hydrazine

Influence of Magnetite Nanoparticles Shape and Spontaneous Surface Oxidation on the Electron Transport Mechanism

Contact Info

Product

Resources

About

Synthesis, characterization, and performance of nanocomposites containing reduced graphene oxide, polyaniline, and cobalt ferrite

Cited by 28 publications

References 73 publications

Square-Facet Nanobar MOF-Derived Co3O4@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies

Square-Facet Nanobar MOF-Derived Co3O4@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies

Electrochemical sensor based on PVP coated cobalt ferrite/graphite/PANI nanocomposite for the detection of hydrazine

Influence of Magnetite Nanoparticles Shape and Spontaneous Surface Oxidation on the Electron Transport Mechanism

Contact Info

Product

Resources

About

Square-Facet Nanobar MOF-Derived Co₃O₄@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies

Square-Facet Nanobar MOF-Derived Co₃O₄@Co/N-doped CNT Core–Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies