Spinel NiCo₂O₄ Nanorods for Supercapacitor Applications

Abstract

Herein, we report successful synthesis method of spinel NiCo 2 O 4 nanorods by a low-cost and facile hydrothermal route. Cyclic Voltametry (CV) and galvanostatic Charge-Discharge (CD) measurements deduce ideal supercapacitive performance (823 F/g) of spinel NiCo 2 O 4 nanorods at a nominal current density of 0.823 A/g with excellent cyclic stability and energy density of 28.51 Wh/Kg.

Facile Synthesis of Bio-Template Tubular MCo2O4 (M = Cr, Mn, Ni) Microstructure and Its Electrochemical Performance in Aqueous Electrolyte

“…All the chemicals required for the synthsis, such as Cobalt nitrate hexahydrate; Co(NO 3 2 .6H 2 O were mixed in 15 ml of distilled water separately, and the mixture was ultra-sonicated for 10 minutes to make a homogenous solution. Then, 1.0 g of cotton was soaked in the mixture solutions for 5 minutes.…”

“…The electrochemical performance of the electrodes was evaluated at RT in 3M KOH electrolyte via cyclic voltammetry and galvanostatic charge-discharge techniques measurements. Figure 1a shows the XRD patterns of the bio-templated CrCo 2 (Table 1). FTIR spectrum, Figure 1b, further identifies the structure of the bio-templated MCo 2 O 4 .…”

“…SCs are in high demand because of their greater power density compared to batteries and higher energy density compared to that of capacitors [1]. In the capacitor, there is no time lag during the charging process; hence it can give higher power density, and in the battery, there is low self-discharge so that it can provide higher energy density [2]. Because of this, a supercapacitor is easy to charge within a short time and able to show significant performance even after prolonged use.…”

Predicting properties of MgO·nAl2O3 by first‐principles calculation combined with bond valence models

“…There is a little difference between values of bulk modulus obtained by the two approaches, but both of them show the same trend with the rise of x. In order to explore the relationship among composition, structure, and compressibility of Mg 1-x Al 2(1+x/3) O 4 further, the bulk modulus of tetrahedra and octahedra were simulated according to Equations (5) and (6). However, the volume of unit cell is underestimated by LDA.…”

“…For the P1 structure calculated within LDA, some atoms are underbonded and the other atoms are overbonded as displayed in Figure 5. In order to explore the relationship among composition, structure, and compressibility of Mg 1-x Al 2(1+x/3) O 4 further, the bulk modulus of tetrahedra and octahedra were simulated according to Equations (5) and (6). The data displayed in Figure 7B show that bulk modulus of tetrahedra increases sharply, while that of octahedra decreases slightly with the rise of x.…”