Abstract
A facile hydrothermal route to control the crystal growth on the synthesis of Co3O4 nanostructures with cube-like morphologies has been reported and tested its suitability for supercapacitor applications. The chemical composition and morphologies of the as-prepared Co3O4 nanoparticles were extensively characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). Varying the temperature caused considerable changes in the morphology, the electrochemical performance increased with rising temperature, and the redox reactions become more reversible. The results showed that the Co3O4 synthesized at a higher temperature (180 °C) demonstrated a high specific capacitance of 833 F/g. This is attributed to the optimal temperature and the controlled growth of nanocubes.
Highlights
Studies on the effects of morphology and crystal growth of the material synthesized on the microand nanoscale have been researched extensively since the discovery of carbon nanotube (CNT) [1]
Co3O4 self-supported nano-crystalline arrays that grown directly on conductive substrates exhibited better electrochemical performance [30,31,32]. These studies intrigued us to study the influence of synthesis temperature in a hydrothermal route on the surface morphology of Co3O4 crystallites and to examine the corresponding redox reactions
The preliminary studies would bring the importance of temperature and its redox behaviour, which could be useful for supercapacitor applications
Summary
Studies on the effects of morphology and crystal growth of the material synthesized on the microand nanoscale have been researched extensively since the discovery of carbon nanotube (CNT) [1]. The temperature is one of the primary factor controlling the size and shape of the particles that influence the material characteristics for electrochemical applications. The electrochemical performance of Co3O4 shown in the literature are varied and influenced by several factors, including particle size, surface morphology, and the ability of particles to adhere to conductive substrates. Co3O4 self-supported nano-crystalline arrays that grown directly on conductive substrates exhibited better electrochemical performance [30,31,32] These studies intrigued us to study the influence of synthesis temperature in a hydrothermal route on the surface morphology of Co3O4 crystallites and to examine the corresponding redox reactions. The preliminary studies would bring the importance of temperature and its redox behaviour, which could be useful for supercapacitor applications
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