Tuning the Redox Properties of the Nanostructured CoMoO₄ Electrode: Effects of Surfactant Content and Synthesis Temperature

Abstract

A systematic study was performed to examine the effects of surfactant content and synthesis temperature on the morphologies and the redox properties of cobalt molybdate (CoMoO 4 ).Results revealed that while varying the concentration of surfactant (F127) the morphology varies from nanorods, to nanospheres and nanoneedles. The concentration of metal to surfactant ratio with 1:1 outperform in specific capacitance, energy density and cycling stability than that of 1:0.5 and 1:2 ratios. The surfactant at the optimised ratio significantly influenced the morphology and particle size of the CoMoO 4 material and act as a template whereas increasing the synthetic temperature did not contribute much to the energy storage. and energy density of 21 W h · kg -1 when tested as a hybrid device. This suggests the redox activity and its storage capability depend on the surfactant content as well as it's selfassembly behaviour. CoMoO 4 showed excellent cycling stability retaining over 75 % of its initial capacitance after 2000 cycles which makes it a very promising candidate for large scale energy storage applications.

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

“…The morphologies of the powder are highly related to the crystal structure [30]. Similar work reported in the literature for molybdate materials [31] suggests that the synthesis temperature has a strong influence on the morphology of Cu 2 S samples. Under the synthesis conditions of high temperature and high pressure, the monoclinic α-Cu 2 S showed a tetradecahedron morphology.…”

Influence of Synthesis Temperature on the Growth and Surface Morphology of Co3O4 Nanocubes for Supercapacitor Applications

“…When the temperature was increased from 100 °C to 180 °C, the redox peaks were seen noticeably, in Figure 7, and have a well defined shape, illustrating that the material is more reversible and the reactions are significant when the material is dominated by Co 3 O 4 nanoparticles. The specific capacitance ‘ C ’ was calculated [41] from the relation:$C\mathrm{normals}=\frac{{{\displaystyle \int }}_{V1}^{V2}iV dv }{2\left(V2-V1\right) \nu m}$ where C s is the specific capacitance in F/g. V 1 and V 2 are the cut off potential, and iV is the instantaneous current.${{\displaystyle \int }}_{V1}^{V2}iV dv$ is the integrated area of the CV curve.…”

“…The predicted values of standard reduction potentials of the proposed redox couples [41] given in Equations (6) and (7) are 0.437 and 0.428 V, respectively, at 100 °C. These values shifted to 0.442 and 0.346 V at 180 °C respectively, and the following redox reactions are considered to be governing the pseudocapacitive properties of Co 3 O 4 .…”

Improvement of Electrochemical Performance of Nickel Rich LiNi0.8Co0.1Mn0.1O2 Cathode by Lithium Aluminates Surface Modifications

“…Within the equivalent circuit model, R s , R ct , and R w represent the internal resistance of a cell, the charge‐transfer resistance between the electrode and the electrolyte, and the Warburg impedance, respectively. CPE is the capacitance of the double layer ,. It can be seen that R ct for S 0 increases from 76.7 to 248.5 Ω after 50 cycles while R ct for S 2 only increases from 33.2 to 49.3 Ω.…”