Sonication-supported synthesis of cobalt oxide assembled on an N-MWCNT composite for electrochemical supercapacitors via three-electrode configuration

Abstract

The Co3O4@N-MWCNT composite was synthesized by a sonication-supported thermal reduction process for supercapacitor applications. The structural and morphological properties of the materials were characterized via Raman, XRD, XPS, SEM–EDX, and FE-TEM analysis. The composite electrode was constructed into a three-electrode configuration and examined by using CV, GCD and EIS analysis. The demonstrated electrochemical value of ~ 225 F/g at 0.5 A/g by the electrode made it appropriate for potential use in supercapacitor applications.

Thermally driven phase transition of cobalt hydroxide sheets via cobalt oxides to cobalt nanoparticles

“…34 The commonly investigated phases of cobalt oxide are spinel Co 3 O 4 , hexagonal CoO (h-CoO), and cubic CoO (c-CoO), [17][18][19][20][21][22] all of which undergo phase transformations under certain conditions. 18,20 The synthesis and use of the stable phases of the cobalt oxides have received considerable attention in recent years, 35,36 and interesting studies have been reported on the thermodynamic behaviors of phase transitions. 17,18,20 However, studies on phase transformations originating from cobalt hydroxide are lacking.…”

Nanostructured mixed transition metal oxide spinels for supercapacitor applications

“…were studied using various approaches which displayed potential SC properties and performances due to the aforementioned Co II –Co III –Co IV interactions, high surface area and porosity, better contact across the electrode/electrolyte interface and faster ion transport. 47–51 Deori et al developed a simple solvothermal strategy to synthesize highly stable, pure phased Co 3 O 4 NPs with controlled size and morphologies viz ., nanocubes, hexagonal platelets and nanospheres from a Co(CH 3 COO) 2 ·4H 2 O precursor in ethanol solvent at 220 °C (Fig. 4a–d).…”

“…Dalton Transactions and porosity, better contact across the electrode/electrolyte interface and faster ion transport. [47][48][49][50][51] 4a-d). 40 The hexagonal platelets' multilayer structural arrangement and the existence of extraordinarily high numbers of regularly ordered pores lead to the improved electrochemical characteristics of Co 3 O 4 .…”

Efficient Recovery Annealing of the Pseudocapacitive Electrode with a High Loading of Cobalt Oxide Nanoparticles for Hybrid Supercapacitor Applications

“…Various synthesis methods such as chemical precipitation, the hydrothermal method, the sol–gel method, photothermal synthesis, etc., are used for the synthesis of pseudocapacitive materials based on Co 3 O 4 [ 31 , 32 , 33 , 34 , 35 ]. To achieve high electrochemical parameters, Co 3 O 4 supercapacitor electrodes are made on the basis of films and porous structures [ 32 , 33 ], composites consisting of an electrically conductive matrix with a large specific surface area, in which Co 3 O 4 nanoparticles are embedded and fixed in the matrix by adhesion forces or a suitable binder [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ], and also various binary and ternary systems of oxides of cobalt and Mo, Mn, and Cu [ 38 , 44 , 45 , 46 , 47 ]. Doping is used to improve the electrical conductivity of cobalt oxide [ 48 , 49 ].…”

“…The volume specific capacitance in the manufacture of supercapacitors is also very important; highly porous materials and aerogels do not satisfy this condition. The method of forming electrodes using active material powder and a suitable binder is adequate to achieve high loading [ 31 , 34 , 37 , 42 , 46 , 49 , 51 ]. This method is practically important due to the scaling potential; therefore, it is being intensively developed.…”