Electrochemical properties of rGO/CoFe2O4 nanocomposites for energy storage application

Kotutha, Isara; Duangchuen, Thanawut; Swatsitang, Ekaphan; Meewasana, Worawat; Khajonrit, Jessada; Maensiri, Santi

doi:10.1007/s11581-019-03114-1

Cited by 20 publications

(19 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The RGCF nanocomposite shows the nanosheets of rGO embellished with CoFe 2 O 4 nanoparticles of smaller size. The intimate relation between rGO sheets and the NPs of CoFe 2 O 4 limits the aggregation of CoFe 2 O 4 NPs . The average particle size (Figure a) has been calculated as 17.8 nm (the value is close to that obtained by FESEM) by drawing the particle size distribution histogram (Figure d) using imageJ software .…”

Section: Resultsmentioning

confidence: 77%

Reduced Graphene Oxide-Modified Spinel Cobalt Ferrite Nanocomposite: Synthesis, Characterization, and Its Superior Adsorption Performance for Dyes and Heavy Metals

Tanweer

Alam

2023

ACS Omega

View full text Add to dashboard Cite

This work is dedicated to the synthesis, characterization, and adsorption performance of reduced graphene oxide-modified spinel cobalt ferrite nanoparticles. The as-synthesized reduced graphene oxide cobalt ferrite (RGCF) nanocomposite has been characterized using FTIR spectroscopy, FESEM coupled with EDXS, XRD, HRTEM, zeta potential, and vibrating sample magnetometer (VSM) measurements. FESEM proves the particle size in the range of 10 nm. FESEM, EDX, TEM, FTIR, and XPS analyses provide the proof of successful incorporation of rGO sheets with cobalt ferrite nanoparticles. The crystallinity and spinel phase of cobalt ferrite nanoparticles have been shown by XRD results. The saturation magnetization (M s ) was measured as 23.62 emu/g, proving the superparamagnetic behavior of RGCF. The adsorption abilities of the synthesized nanocomposite have been tested using cationic crystal violet (CV) and brilliant green (BG) and anionic methyl orange (MO) and Congo red (CR) dyes. The adsorption trend for MO, CR, BG, and As(V) follows RGCF > rGO > CF at neutral pH. Adsorption studies have been accomplished by optimizing parameters like pH (2−8), adsorbent dose (1−3 mg/25 mL), initial concentration (10−200 mg/L), and contact time at constant room temperature (RT). To further investigate the sorption behavior, isotherm, kinetics, and thermodynamic studies have been conducted. Langmuir isotherm and pseudo-secondorder kinetic models suited better for the adsorption of dyes and heavy metals. The maximum adsorption capacities (q m ) obtained have been found as 1666.7, 1000, 416.6, and 222.2 mg/g for MO, CR, BG, and As, respectively, with operational parameters such as T = 298.15 K; RGCF dose: 1 mg for MO and 1.5 mg each for CR, BG, and As. Thus, the RGCF nanocomposite was found to be an excellent adsorbent for the removal of dyes and heavy metals.

show abstract

Section: Resultsmentioning

confidence: 77%

Reduced Graphene Oxide-Modified Spinel Cobalt Ferrite Nanocomposite: Synthesis, Characterization, and Its Superior Adsorption Performance for Dyes and Heavy Metals

Tanweer

Alam

2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Therefore, the magnetic saturation values of CoFe2O4/SiO2 and CoFe2O4/SiO2/Ag composites were 44.67 emu/g and 41.82 emu/g, respectively. Previous research showed that CoFe2O4 coating with rGO reduces magnetic dipole interactions between adjacent magnetic particles and isolates the particles from magnetic fields [29]. Figure 4 shows an elemental mapping analysis that indicates the elements in the CoFe2O4/SiO2/Ag composite.…”

Section: Resultsmentioning

confidence: 97%

Preparation of CoFe2O4/SiO2/Ag Magnetic Composite as Photocatalyst for Congo Red Dye and Antibacterial Potential

et al. 2022

View full text Add to dashboard Cite

This research reports the synthesized CoFe2O4/SiO2/Ag magnetic composite used as a photocatalyst to degrade Congo red dye and antibacterial agent against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). The catalysts were characterized using XRD, SEM-EDS, VSM, UV-DRS, and pHpzc. The effects of photocatalyst dose (0.25, 0.5, 0.75, and 1.0 g/L), dye concentration (10, 20, 30, and 40 mg/L), and irradiation time (0–210 minutes) were all examined as photocatalytic degradation variables. The results showed that the CoFe2O4/SiO2/Ag composite was superparamagnetic with a saturation magnetization of 41.82 emu/g and had a band gap of 1.82 eV. The highest efficiency of decreasing the concentration of Congo red dye of 93.70% was obtained with an initial concentration of 10 mg/L, a catalyst dose of 0.5 g/L, and an irradiation time of 180 minutes. This study indicated that the composite had antibacterial properties against Gram-positive (S. aureus) and Gram-negative (E. coli) bacteria with the same MIC value of 1.25%. These results indicated that the CoFe2O4/SiO2/Ag composite has significant potential for applications in wastewater treatment.

show abstract

“…On the one hand, the downtrend of H C from S0 to S5 could be ascribed to the diamagnetic property of RGO and Cu. The RGO sheets and Cu nanorods surrounding the Fe 3 O 4 nanoparticles would decrease the magnetic dipole interactions between adjacent magnetic particles . On the other hand, H C is also inversely proportional to the particle size .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The RGO sheets and Cu nanorods surrounding the Fe 3 O 4 nanoparticles would decrease the magnetic dipole interactions between adjacent magnetic particles. 29 On the other hand, H C is also inversely proportional to the particle size. 30 Therefore, the enhanced H C shown in S10 could be explained by the obvious reduction of the particle size of Fe 3 O 4 compared to the other samples.…”

Section: Resultsmentioning

confidence: 99%

Regulating Percolation Threshold via Dual Conductive Phases for High-Efficiency Microwave Absorption Performance in C and X Bands

Fang

Liu

Yang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The development of high-efficiency microwave absorbers for C and X bands still remains a challenge, limiting the settlement of corresponding electromagnetic pollution and radar stealth. In this work, a reduced graphene oxide (RGO)/Cu/Fe3O4 composite is successfully proposed by a one-step solvothermal method with a GO dispersion content of 5 mL, where Fe3O4 exhibits high magnetic loss from natural resonance at the C band, and Cu nanorods and RGO are introduced as dual conductive phases to produce suitable dielectric properties by regulating the percolation threshold. The results show that the existence of Cu nanorods significantly reduces the conductivity and dielectric loss of the composites, optimizing the coordination of attenuation capacity and impedance matching in the C and X bands. Consequently, the obtained RGO/Cu/Fe3O4 composite shows outstanding microwave absorption performance with the maximum effective absorption bandwidth (EAB) value of 5.2 GHz at a thin thickness of 3.1 mm, which covers 84% of the C band and 46% of the X band (4.64–9.84 GHz). The performance is superior to the vast majority of previous absorbers in the corresponding bands.

show abstract

Electrochemical properties of rGO/CoFe2O4 nanocomposites for energy storage application

Cited by 20 publications

References 34 publications

Reduced Graphene Oxide-Modified Spinel Cobalt Ferrite Nanocomposite: Synthesis, Characterization, and Its Superior Adsorption Performance for Dyes and Heavy Metals

Reduced Graphene Oxide-Modified Spinel Cobalt Ferrite Nanocomposite: Synthesis, Characterization, and Its Superior Adsorption Performance for Dyes and Heavy Metals

Preparation of CoFe2O4/SiO2/Ag Magnetic Composite as Photocatalyst for Congo Red Dye and Antibacterial Potential

Regulating Percolation Threshold via Dual Conductive Phases for High-Efficiency Microwave Absorption Performance in C and X Bands

Contact Info

Product

Resources

About