Solvothermal synthesis of octahedral and magnetic CoFe<sub>2</sub>O<sub>4</sub>–reduced graphene oxide hybrids and their photo-Fenton-like behavior under visible-light irradiation

Hu, Liling; Li, Meng; Cheng, Lihong; Jiang, Bofan; Ai, Jianping

doi:10.1039/d1ra03103a

Cited by 34 publications

(21 citation statements)

References 63 publications

(86 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peaks at 724.3 and 711.04 eV are due to the spin–orbit splitting of Fe 2p 1/2 and Fe 2p 3/2 orbitals of Fe(III) present in the octahedral sites, and the peaks at 727.1 and 713.5 eV are from the Fe 2p 1/2 and Fe 2p 3/2 orbitals of Fe(III) in the tetrahedral sites. 27 , 40 Figure 4 c depicts the high-resolution XPS spectrum of O 1s, which is fitted with two peaks assigned to the metal–oxygen (M–O) bond (530.5 eV) in the lattice sites and oxygen-containing functional groups (532.7 eV). 23 , 27 The high-resolution C 1s spectrum ( Figure 4 d) is comprised of four main peaks, which are assigned to C–C (284.84 eV), C–O (286.61 eV), and O–C=O bonds (287.77 eV) and one π–π* shake-up satellite peak at 291.62 eV.…”

Section: Resultsmentioning

confidence: 99%

CoFe₂O₄ Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

2022

View full text Add to dashboard Cite

The energy demand, the crisis of fossil fuels, and the increasing popularity of portable and wearable electronics in the global market have triggered the demand to develop high-performance flexible all-solid-state supercapacitors that are capable of delivering high energy at high power density as well as being safely entrenched in those electronics. Herein, we have designed a nanocomposite, 80CF hs -20rGO sp , which exhibits a high specific capacitance ( C S ) value of 1032 F g –1 at 3 A g –1 . Utilizing this nanocomposite as the cathode and reduced graphene oxide sponge (rGO sp ) as the anode, a flexible all-solid-state asymmetric device has been fabricated. In this device, poly(vinyl alcohol) (PVA) gel embedded with a mixture of 3 M KOH and 0.1 M K 4 [Fe(CN) 6 ] was used as an electrolyte cum separator. The fabricated device showed the capability to deliver an energy density of 65.8 W h kg –1 at a power density of 1500 W kg –1 and retained its capability even after various physical deformations. The device also exhibited a long cycle life and retained ∼96% of its C S value after 5000 cycles. Moreover, the fabricated flexible all-solid-state device successfully illuminated light-emitting diodes, which proved its potential use in real-life supercapacitor applications. The obtained results revealed the excellent electrochemical performances of the fabricated device and rendered it a promising candidate in the energy sector.

show abstract

Section: Resultsmentioning

confidence: 99%

CoFe₂O₄ Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

2022

View full text Add to dashboard Cite

show abstract

“…The studies revealed the weight loss of the composite materials. The intense weight loss was observed in the temperature range of 700-800 °C, which could be attributed to the intrinsic magnetic transformation of CoFe 2 O 4 (Hu et al 2021). At temperature above 200 °C, the thermal stability of GO decomposed due to the decomposition of carboxylic and release CO 2 gas (Najafi and Rajabi 2015;Selvaraj et al 2015).…”

Section: Resultsmentioning

confidence: 96%

The synthesis and characterization of graphene-based cobalt ferrite nanocomposite materials and its electrochemical properties

Alruwashid

Dar²,

Alharthi

et al. 2021

Appl Nanosci

View full text Add to dashboard Cite

Cobalt ferrite/graphene nanocomposite materials were prepared by a one-pot hydrothermal method. Graphene oxide (GO) was synthesized by a modified Hummers method. The surface morphologies and structures of CoFe 2 O 4 /graphene nanocomposite materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), thermogravimetric analyzer (TGA), and fourier transform infrared spectroscopy (FTIR). SEM and TEM investigations unveiled that graphene sheets were uniformly well decorated by spherical cobalt ferrite nanoparticles (~ 3-6 nm). Electrochemical studies on CoFe 2 O 4 /graphene nanocomposite revealed the decline in the charge transfer resistance (~ 27 Ω), while on the other hand, higher corrosion current density (0.3837) and corrosion rates (0.00446) were observed. Cyclic voltammograms (CV) outcomes confirmed supercapacitor performance. The poor corrosion performance of the nanocomposite materials could be attributed to its higher conductivity.

show abstract

“…The mild weight loss between 301-400 • C was attributed to the removal of labile oxygen-containing functional groups [30]. Significant weight loss occurred in the temperature region of 800-900 • C, which might be assigned to the intrinsic magnetic transformation of CoFe 2 O 4 [31]. The mass loss of the nanocomposite samples with different graphene ratios (i.e., 1, 3, and 5 wt%) was found to be increased when it was compared with the mass loss of pure nanoparticles.…”

Section: Resultsmentioning

confidence: 98%

Effect of Graphene Concentration on the Electrochemical Properties of Cobalt Ferrite Nanocomposite Materials

Alruwashid

Dar²,

Alharthi

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

A two-step process was applied to synthesize the cobalt ferrite-graphene composite materials in a one-pot hydrothermal reaction process. Graphene Oxide (GO) was synthesized by a modified Hummer’s method. The synthesized composite materials were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FTIR). The XRD and FTIR results were in good agreement with the TGA/DTG observations. SEM and TEM disclosed the spherical shape of the nanoparticles in 4–10 nm. The optimized CoFe2O4-G (1–5 wt.%) composite materials samples were tried for their conductivity, supercapacity, and corrosion properties. The CV results demonstrated a distinctive behavior of the supercapacitor, while the modified CoFe2O4-G (5 wt.%) electrode demonstrated a strong reduction in the Rct value (~94 Ω). The highest corrosion current density valves and corrosion rates were attained in the CoFe2O4-G (5 wt.%) composite materials as 5.53 and 0.20, respectively. The high conductivity of graphene that initiated the poor corrosion rate of the CoFe2O4-graphene composite materials could be accredited to the high conductivity and reactivity.

show abstract

Solvothermal synthesis of octahedral and magnetic CoFe₂O₄–reduced graphene oxide hybrids and their photo-Fenton-like behavior under visible-light irradiation

Abstract: Schematic illustration of an active heterogeneous photo-Fenton mechanism based on CoFe2O4–RGO hybrids.

Cited by 34 publications

References 63 publications

CoFe₂O₄ Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

CoFe₂O₄ Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

The synthesis and characterization of graphene-based cobalt ferrite nanocomposite materials and its electrochemical properties

Effect of Graphene Concentration on the Electrochemical Properties of Cobalt Ferrite Nanocomposite Materials

Contact Info

Product

Resources

About

Solvothermal synthesis of octahedral and magnetic CoFe2O4–reduced graphene oxide hybrids and their photo-Fenton-like behavior under visible-light irradiation

Abstract: Schematic illustration of an active heterogeneous photo-Fenton mechanism based on CoFe2O4–RGO hybrids.

Cited by 34 publications

References 63 publications

CoFe2O4 Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

CoFe2O4 Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

The synthesis and characterization of graphene-based cobalt ferrite nanocomposite materials and its electrochemical properties

Effect of Graphene Concentration on the Electrochemical Properties of Cobalt Ferrite Nanocomposite Materials

Contact Info

Product

Resources

About

Solvothermal synthesis of octahedral and magnetic CoFe₂O₄–reduced graphene oxide hybrids and their photo-Fenton-like behavior under visible-light irradiation

CoFe₂O₄ Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

CoFe₂O₄ Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices