Pseudocapacitance Properties of Co3O4 Nanoparticles Synthesized Using a Modified Sol-Gel Method

Abstract

This work reports the synthesization of nanoparticles cobalt oxide (Co 3 O 4 ) with no secondary phase by a modified sol-gel method and its structural morphological and electrochemical characterizations. FTIR, XRD and Raman analysis showed the formation of spinel cobalt oxide with no secondary phase. TEM images revealed that an undefined morphology with average crystallite size estimated by Scherrer's equation was found to be 30 nm. Experiments of cyclic voltametric, galvanostatic chargedischarge and impedance spectroscopy were evaluated at 1 mol L -1 KOH and revealed an intrinsic pseudocapacitance. The studies of complex capacitance and complex power revealed the resistive and capacitive characteristics with a specific capacitance of 120 F g -1 .

Specific capacitance behavior of Co‐Co 3 O 4 nanocomposite thin films synthesized via different electrodeposition modes

“…The wavenumber ranges within which these absorption bands appear are also in good agreement with reports in the literature. 15,18,[26][27][28] While the formation of Co 3 O 4 is evident from the IR absorption bands in Figure 3A, the intensities of these bands are obviously varying. Therefore, in order to understand the oxide peak intensities and their possible effect on the supercapacitive behavior of these thin films, we further investigated the area under these two representative peaks and are presented in Figure 3B.…”

“…These techniques require the use of binders and conductive materials, which increase the electrode resistance affecting their supercapacitance performance. 17,18 Recently, electrodeposition has become a useful technique for growing Co-O nanostructures with desired composition and morphology directly onto the substrates without necessitating the use of binders. In electrodeposition, several factors such as electrolyte composition, temperature, type of electrodeposition mode, duration of the electrode deposition process, etc., can be adjusted to obtain the desired morphology and texture such as nanoporous structure, nanocolumnar structure, and nanoflower-like structure.…”

A Review of Supercapacitors: Materials Design, Modification, and Applications

“…Zhang Yong et al [116] reported the preparation of NiCo 2 O 4 with a diameter in the range of 20-30 nm through the sol-gel method using the Ni(NO 3 ) 2 [116], (Ni-MnO 2 ) [130], NiO-CeO 2 [131], Co 3 O 4 [132], MnO 2 [133], mixed ternary transition metal ferrite (MTTMF) [134] etc., were also prepared using the sol-gel method. Figure 6 indicates the sol-gel process for the synthesis of supercapacitor electrode materials.…”

Recent Advance in Co3O4 and Co3O4-Containing Electrode Materials for High-Performance Supercapacitors

“…The sol-gel method has some advantages, such as low reaction temperature, ease of operation, miscellaneous and uniform molecular-level mixing, smaller size, and so on [45]. Co 3 O 4 nanoparticles with no secondary phase were synthesized via the sol-gel method [46]. The Co 3 O 4 nanoparticles delivered a Cs of 120 F•g −1 at 1 A•g −1 in a voltage window of 0 to 0.6 V. In addition, Lakehal et al [47] prepared Co 3 O 4 electrode materials by adopting the sol-gel-based dip-coating process on a glass substrate.…”