Synthesis of graphene–NiFe2O4 nanocomposites and their electrochemical capacitive behavior

Abstract

Reduced graphite oxide-NiFe 2 O 4 (RGO-NiFe 2 O 4 ) composites were synthesized by adding different amounts of NH 3 $H 2 O into a mixed aqueous solution of graphite oxide, Ni(NO 3 ) 2 and Fe(NO 3 ) 3 at room temperature. NH 3 $H 2 O was used to adjust the synthesis system's pH value. The morphology and the microstructure of the as-prepared composites were characterized by X-ray diffraction (XRD), BrunauerEmmett-Teller (BET) and transmission electron microscope (TEM) techniques. The structure characterizations indicate that NiFe 2 O 4 successfully deposited on the surface of the RGO and the morphologies of RGO-NiFe 2 O 4 show a transparent structure with NiFe 2 O 4 homogeneously distributed on the RGO surfaces. Capacitive properties of the synthesized electrodes were studied using cyclic voltammetry and electrochemical impedance spectroscopy in a three-electrode experimental setup using 1 M Na 2 SO 4 aqueous solution as electrolyte. It is found that the pH value plays an important role in controlling the electrochemical properties of these electrodes. Among the synthesized electrodes, RGONiFe 10 (pH ¼ 10) shows the best capacitive properties because of its suitable particle size and good dispersion property. It could be anticipated that the synthesized electrodes will gain promising applications as novel electrode materials in supercapacitors and other devices by virtue of their outstanding characteristics of controllable capacitance and facile synthesis.

Hybrids of NiCo 2 O 4 nanorods and nanobundles with graphene as promising electrode materials for supercapacitors

“…Recently, numerous works have been done on hybrid metal oxides-reduced graphite oxide (RGO), such as Mn 3 O 4 , Co 3 O 4 , NiO, Fe 2 O 3 , and NiAl-LDH [17][18][19][20][21][22]. However, spinel transition metal oxides (AB 2 O 4 ), with two metal elements provide the feasibility to tune the energy density and working voltage by varying the metal content, have less been developed [23][24][25] …”

Investigation on spinel MnCo2O4 electrode material prepared via controlled and uncontrolled synthesis route for supercapacitor application

“…Complex oxides such as MnCo 2 O 4 [14,15], ZnMn 2 O 4 [16], NiCo 2 O 4 [17], NiFe 2 O 4 [18], and ZnCo 2 O 4 [19] etc., have been investigated as electrode materials for supercapacitors because of their excellent electrochemical performances. Among them, manganese-based oxide spinels are useful in many application fields (transport, telecommunication, medicine, and energy) due to their element abundance, low cost, and toxicity and electrical characteristics [14,15].…”

Electrochemical detection of a pathogenic Escherichia coli specific DNA sequence based on a graphene oxide–chitosan composite decorated with nickel ferrite nanoparticles

“…It can be observed that when the nanoparticles were deposited on graphene sheets they were uniformly distributed and entrapped inside the GO matrix forming an interconnected hybrid network. 29 The incorporation of nanoparticles into the graphene sheets prevents the agglomeration of nanoparticles and privileges the nucleation over growth and this combined effect led to the good particle density and monodispersity observed in the GO/NiF/ch nanocomposite. To investigate the stability of the particle, zeta potential measurements have been performed.…”

“…However, until now, very few reports are available concerning the NiFe 2 O 4 graphene nanocomposites. 29,30 Chitosan, a natural polymer, is used to disperse nanomaterials due to its admirable properties such as non-toxicity, biodegradability, and good compatibility.…”