Abstract
A detailed comparative study on the synthesis process of coral-like CuO/Cu2O nanorods (NRs) and nanopolycrystals (NPCs) fabricated on Cu foil employing aqueous electrolyte via potentiostatic (POT) and galvanostatic (GAL) modes is discussed. The structural, morphological, thermal, compositional, and molecular vibration of the prepared CuO/Cu2O nanostructures was characterized by XRD, HRSEM, TG/DTA, FTIR, and EDX techniques. XRD analysis confirmed the crystalline phase of the formation of monoclinic CuO and cubic Cu2O nanostructures with well-defined morphology. The average particle size was found to be 21.52 nm and 26.59 nm for NRs (POT) and NPCs (GAL), respectively, and this result is corroborated from the HRSEM analysis. POT synthesized nanoparticle depicted a higher thermal stability up to 600°C implying that the potentiostatically grown coral-like NRs exhibit a good crystallinity and well-ordered morphology.
Highlights
Development of efficient energy storage devices has gained a tremendous attention in recent years and
The widely used processing routes among the various methods reported in the literature to fabricate CuO-Cu2O are the hydrothermal method, electrochemical deposition [42], electrostatic spray deposition (ESD), sonochemical methods [43], and chemical bath method
Deionized water (DI) was obtained from the Deionizer Millipore Simplicity UV system, alumina powder has been procured from Merck, and acetone (99.5% purity), isopropyl alcohol (98% purity), and ethanol (96% purity) were purchased from SigmaAldrich
Summary
Development of efficient energy storage devices has gained a tremendous attention in recent years and. Transition metal oxide/hydroxide such as CoO [9, 10], RuO2 [11], NiO [12, 13], MgO, CuO [14,15,16,17,18], TiO2 [19, 20], and FeO [21, 22] is the most commonly used electrode material in a electrochemical setup, and they determine the electrochemical performance of the supercapacitors [23] Among these transition metal oxides, CuO is a multifunctional material, and it has versatile properties like inexpensiveness, low-toxicity, high theoretical capacity (670 mAhg−1), and low electrical conductivity [24,25,26]. The comparative study fascinatingly helps to identify the prominent structures in which large amount of electrons could be packed into a small surface area that may help promoting the applications of the super capacitors
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