Gama-Fe2O3 silica-coated 2-(2-benzothiazolyl azo)-4-methoxyaniline for supercapacitive performance

Abstract

Magnetic g-Fe2O3@SiO2 core-shell nanocomposite was prepared using Stöber method and functionalized firstly by isopropenyloxytrimethylsilane as a coupling agent to enter active acetylacetone on the surface of nanoparticles, and after that by the synthesized azo dye ligand, 2-(2-benzothiazolyl azo)-4-methoxyaniline. In such a way, g-Fe2O3@SiO2-azo dye hybrid nanocomposite was formed. The structure of the synthesized azo dye was evidenced by physical and chemical analysis using melting point, Fourier-transform infrared spectroscopy (FT-IR), CHNS elemental analysis, proton nuclear magnetic reso­nan­ce (HNMR) and gas chromatography mass spectrometry (GC-MS). The magnetic proper­ties, structure, element composition and morphology characterization of prepared mate­rials (g-Fe2O3, g-Fe2O3@SiO2, and g-Fe2O3@SiO2-azo dye) were investigated by vib­rating sample magnetometer (VSM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron spectroscopy (TEM) and field electron scanning electron micro­scopy-energy dispersive X-ray-mapping techniques. The electrochemical perfor­mance of synthe­sized g-Fe2O3, g-Fe2O3@SiO2, and g-Fe2O3@SiO2-2-(2-benzothiazolyl azo)-4-methoxy­aniline) electrodes were carried out using cyclic voltammetry (CV), galva­nostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). It was shown that the finally prepared g-Fe2O3@SiO2-2-(2-benzothiazolyl azo)-4-methoxy­aniline) hybrid nano­composite electrode possesses good storage charge capability of 580 F g-1 at 1 A g-1.

Preparation of nanocomposites for corrosion treatment

“…X-ray diffraction pattern for (Copper oxide) was shown in Figure 2. The Deby-Sherrer formula listed below was used to calculate the particle sizes [15][16][17][18]:…”

High-Performance Supercapacitors Utilising PEDOT Composite Electrodes; Synthesis, Characterisation and Electrochemical Performance Analysis

“…On the other hand, EDLCs have limited energy density because of their electrostatic surface charging mechanism [15]. To overcome these limitations, recent research efforts have focused on the development of new composite materials that will synergistically integrate the advantages of EDLCs and pseudocapacitors, with the goal of developing high-performance devices [16][17][18][19][20][21][22][23].…”