Simultaneous electro-generation and electro-deposition of copper oxide nanoparticles on glassy carbon electrode and its sensor application

Abstract

Copper oxide nanoparticles (CuO) were electro-generated and electro-deposited simultaneously on the glassy carbon electrode (GCE) using cyclic voltammetry at a reduction potential of − 1.4 V to − 0.2 V in 0.1 M NaOH and 1.67 mM CuCl solution. The electrodeposited CuO nanoparticles show an excellent electro-catalytic activity towards the detection of potassium ferricyanide. The scan rate, concentration of the analyte and pH of the solution were varied accordingly to study the stability of the copper oxide deposited glassy carbon electrode (CuO/GCE). The CuO/GCE electrode shows amazing stability, charge transfer and reproducibility even at low concentration of the analyte. The cyclic voltammetry is proved to be one of the convenient methods to reduce the precursors into metal oxide nanoparticles just by applying suitable current. The main advantage of this method is uniform deposition of CuO nanoparticles on GCE and thus increases the number of active sites, surface area and electro-catalytic properties. Scanning electron microscopy (SEM) was used to study the morphology of the electro-generated CuO nanoparticles. The zeta-potential analysis was carried out to study the surface potential of charged CuO nanoparticles and it was found to be + 58.29 mV. Further, CuO nanoparticles were characterized by X-ray diffraction to study the phases. UV-visible spectroscopy depicts the absorption peak at 288 nm confirms the formation of CuO nanoparticles. This absorption is attributed by the electronic transition from valence band to conduction band due to the quantum size of the particles.

Effect of Supporting Background Electrolytes on the Nanostructure Morphologies and Electrochemical Behaviors of Electrodeposited Gold Nanoparticles on Glassy Carbon Electrode Surfaces

“…This could be due to the effect of the zeta potential (ζ-potential), where it has been widely used as an indicator for the dispersion stability of nanoparticles. Thus, the distribution of AuNPs onto the surface of the GC electrodes during the electrodeposition process may also be affected by the ζ-potential, which has been influenced by the different types of the supporting electrolytes. , In principal, a lower ζ-potential will result in a high degree of the dispersion, aggregation, and agglomeration of nanoparticles during the nucleation and growth processes. Hence, we expect that the ζ-potential magnitude during the electrodeposition of AuNPs in KNO 3 may be smaller than that for the electrodeposition of AuNPs in NaNO 3 .…”

Muntingia calabura Leaves Mediated Green Synthesis of CuO Nanorods: Exploiting Phytochemicals for Unique Morphology

“…Due to their high surface area to volume ratio, CuO NPs are widely used in sensors, energy storage devices, antimicrobial activity, environmental remediation, and catalytic applications [1][2][3][4]. To date, several experimental methods have been utilized to synthesize CuO NPs, including sol-gel process [5], electrochemical approach [6], sonochemistry [7], and microwave irradiation [8]. While the conventional wet chemistry method was very effective in producing homogeneously sized CuO NPs, the environmental hazards posed by the usage of certain chemical species remained a major concern [9,10].…”

A Review on Cyclic Voltammetric Investigation of Toxic Heavy Metals

“…Therefore, we need some standard analytical methods to detect the presence of heavy metal ions in foods, plants, animals, water, and soils. Electrochemical methods like cyclic voltammetry [9][10][11][12][13][14][15][16], stripping voltammetry, [4]. differential pulse voltammetry, and polarography are so far best and popular choice to determine the various heavy metals in the environment.…”