Green Synthesis of NiFe2O4 Nano-Spinel Oxide-Decorated Carbon Nanotubes for Efficient Capacitive Performance—Effect of Electrolyte Concentration

Abstract

Energy storage applications received great attention due to environmental aspects. A green method was used to prepare a composite of nickel–iron-based spinel oxide nanoparticle@CNT. The prepared materials were characterized by different analytical methods like X-ray diffraction, X-ray photon spectroscopy (XPS), scanning electron microscopy (SEM), and transmitted electron microscopy (TEM). The synergistic effect between nickel–iron oxide and carbon nanotubes was characterized using different electrochemical methods like cyclic voltammetry (CV), galvanostatic charging/discharging (GCD), and electrochemical impedance spectroscopy (EIS). The capacitances of the pristine NiFe2O4 and NiFe2O4@CNT were studied in different electrolyte concentrations. The effect of OH− concentrations was studied for modified and non-modified surfaces. Furthermore, the specific capacitance was estimated for pristine and modified NiFe2O4 at a wide current range (5 to 17 A g−1). Thus, the durability of different surfaces after 2000 cycles was studied, and the capacitance retention was estimated as 78.8 and 90.1% for pristine and modified NiFe2O4. On the other hand, the capacitance rate capability was observed as 65.1% (5 to 17 A g−1) and 62.4% (5 to 17 A g−1) for NiFe2O4 and NiFe2O4@CNT electrodes.

Batch-Injection Amperometric Determination of Glucose Using a NiFe2O4/Carbon Nanotube Composite Enzymeless Sensor

“…On the other hand, spinel ferrites showed powerful catalytic properties for the detection of target species in biological matrices without requiring the combination with enzymes or other biological agents [20]. They offer additional advantages, including biocompatibility, low production cost, low toxicity, high conductivity, and ferromagnetic properties [21][22][23]. Moreover, NiFe 2 O 4 presents a stable crystalline phase, which increases the stability of the material during the synthesis and application.…”

Synergetic effect of essential oils and calcium phosphate nanoparticles for enhancement the corrosion resistance of titanium dental implant

“…TiO2 layer is easily hydrated when exposed to an aqueous medium, and the developing hydroxyl functional group will improve the chemical activity toward other ions such as phosphate and calcium 13 . Furthermore, calcium phosphate was reported as an effective coat for anodized Ti metal and its alloys [16][17][18] and other biomaterial metals such as Mg, Zn, Sr, Ca, Ag, and Zr [14][15][16][17] , due to the obtaining of morphology and chemical structure similar to natural bone.…”

“…Plants contain compounds like carotenoids, phenols, vitamins, and flavonoids that reduce agents [18][19][20] . Plant extract products, such as essential oils, are used in tiny concentrations to protect the surface of metals from corrosive environments.…”