Electrochemical properties of various rock-shaped-CuO/graphite (G) composites and monoclinic structure CuO nanoparticles as the cathode versus a zinc plate as the anode in a 4M NaOH electrolyte were elucidated by electrochemical impedance spectroscopy (EIS) and chronopotentiometry (CP) in a two electrode configuration cell.Various values of G 9, 16 and 28 wt% were prepared and studied as cathode materials for an alkaline Zn-CuO Battery. The EIS results demonstrated that increasing the mass ratio of G caused significant decrease in charge transfer resistance (Rct) and capacitive behavior of the electrode. Also, the discharging voltage of the cells was increased due to raising the mass ratio of the graphite. Besides, electrochemical properties of the monoclinic structure CuO nanoparticles as cathode material in the alkaline battery was compared with a rock shaped CuO particles. The results showed that the discharged voltage of monoclinic CuO nanoparticles is less than another rock shaped CuO nanoparticles form.

In last two-decade preparation of materials by microwave irradiation became subject of interest among scientists and engineers. This method offers several advantages in comparison to conventional method including saving in time and energy. In addition, microwave irradiation is very selective in heating and consequently is very efficient in material processing relative to conventional heating. In the present study the CU2(OH)3NO3, gerhardtit, which is a precursor for the preparation of multicomponet oxide with spinel structure was prepared by microwave irradiation from mixture of aluminum nitrate and copper oxide. The effect of irradiation time and the mole ratio of substrates in the preparation of gerhardtit have been investigated. The prepared materials were characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and infrared spectroscopy (FT-IR). The results compared to the data obtained for the same material, prepared by conventional heating.

In this article, the structural, magnetic, and optical properties of CuO doped by cerium metal ions as a rare earth element synthesized by the hydrothermal method have been investigated. Various techniques such as X-ray diffraction (XRD) along with Rietveld refinement analysis, energy dispersive X-ray analysis (EDX), and field emission scanning electron microscopy (FESEM) have been used to investigate the crystalline and morphological properties. The results demonstrated that the samples crystallized in the form of polycrystalline and nanosheets with a monoclinic structure. Rietveld refinement of the sample showed sensible accord among the experimental data and standard CuO lattice constants. Also, the existing elements are evenly distributed on the surface of the sample and no impurity elements were observed in the material. By using UV-Vis absorption spectroscopy, the optical band gap of the sample was calculated at an acceptable value. To investigate the magnetic properties, a vibrating sample magnetometer (VSM) was carried out, which showed the weak ferromagnetic property of the Ce-doped sample.

Incorporation of CuO into ZnO contributes to the formation of CuO/ZnO composite, thus enhancing some properties of individual oxides such as antibacterial and photocatalytic activities. The current study evaluated the effect of both synthesis and in-situ syntheses of copper oxide on the zinc oxide particles using Copper(II) nitrate trihydrate as the starting material as well as acetic acid, D200, SHMP, PVP, CTAB, SDS, urea, and M2P surfactants. The impact of surfactants on the microstructure and chromatic properties of the samples was also investigated. The results from scanning electron micrographs showed different morphologies of copper oxide particles in the forms of needle, round, and flake depending on the type of surfactant. Moreover, the chromatic properties of the powders showed that the pigment synthesized in the presence of SHMP was in a better and darker black color than the others. Further, copper oxide powders exhibited more proper anti-bacterial behavior than the copper oxide/zinc oxide composite powders. In addition, copper oxide/zinc oxide particles had higher photocatalytic activity (up to 95 %) than copper oxide powders (about 65 %).

Copper oxide and nickel oxide-copper oxide (NiO-CuO) metal oxide nanoparticles were prepared by co-precipitation method in aqueous solution using sodium hydroxide as precipitating agent and Cetyl Trimethyl Ammonium Bromide (CTAB) as a surfactant. The particles were characterized by XRD, SEM, EDS and FTIR analysis. The crystallite sizes of both metal oxide particles were in the nano range calculated by Debye-Scherrer equation. The prepared metal oxide nanoparticles were employed for the fabrication of zinc-composite coating on mild steel by electroplating and their corrosion behaviour was investigated by Tafel and Electrochemical impedance spectroscopy in corrosive media of 3. 5% NaCl solution. The surface morphology of coated steel articles and also their corrosion morphology have been characterized by scanning electron microscopic (SEM) images.

An empirical electrical conductivity assessment of nanofluids comprising CuO nanoparticles water-based in different concentrations, particles size and various temperatures of nanofluids has been carried out in this paper. These experimentations have been done in deionized water with nanoparticles sizes such as 89, 95, 100 and 112 nm and concentrations of 0.12 g/l, 0.14 g/l, 0.16 g/l and 0.18 g/l so nanofluids obtain in temperatures such as 25oC, 35oC, 45oC and 50oC for investigation of their electrical conductivity. It is observed that, in water-based nanofluids, the electrical conductivity increases with increasing in both nanofluids temperatures and concentration respectively in the range 25-50oC and 0.12-0.18g/l. But in nanoparticles size rising in nanofluids we observe that electrical conductivity has a few increase when nanoparticles have 95nm diameters, so decrease for biggest nanoparticles such as 100 and 112nm. It seems that there is an optimum in electrical conductivity with resize of nanoparticles.

In this work, CuO nanoparticles (CuO NPs) was prepared by a simple and green method using Rosmarinus officinalis extract containing phenolic constituents as both the chelating and the stabilizing agents. CuO nanoparticles/polyorthoaminophenol composite (CuO NPs/POAP) as electro-active electrodes for electrocatalytic oxidation of methanol with good uniformity are prepared by electropolymerization. Composite of CuO NPs/POAP was synthesized by cyclic voltammetry (CV) methods and electrochemical properties of film were investigated by using electrochemical techniques. New composite modified electrode shows a significantly high response for methanol oxidation. This method of synthesis of the catalyst and composite has the advantages of high yields, elimination of chemical reagent and simple methodology. Catalytic efficiency remains unaltered even after several repeated cycles.

In the present study, copper oxide (CuO) nanosheets were synthesized by a bottom-up (hydrothermal) method. The structural properties, morphology and particle size of the synthesized nanosheets were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) analyses. In addition, the photocatalytic properties of the hydrothermally synthesized nanosheets in the removal of the organic dye reactive black 5 were studied and on the other hand, the photocatalytic activity of these nanosheets was compared with spherical copper oxide nanoparticles. The charge transfer during the photocatalytic process and electrochemical properties of the nanosheets and the nanoparticles were investigated by photocurrent, photoluminescence and impedance analyses, respectively. The results showed that copper oxide nanosheets had a higher removal rate (79.42) than copper oxide nanoparticle (32.23). On the other hand, increasing the photocurrent density and decreasing the electrochemical impedance value support the reduction of the recombination rate of the electron-hole pair generated by the light in the nanosheets compared to the copper oxide nanoparticles. Also, the increase in the surface area of the nanosheets compared to the copper oxide nanoparticles led to the creation of active sites for the generation of hydroxyl radicals by the holes created in the valence band to increase the photocatalytic efficiency. Finally, the copper oxide nanosheets can be introduced as highly active photocatalysts for the removal of dye and pharmaceutical pollutants.

This paper presents the catalytic effect of Al/CuO nanothermite on thermal decomposition of RDX. Currently, synthesizing a green alternative for primary explosives has become a new challenge for researchers. Therefore, feasibility of nanothermite-based nanocomposite Al/CuO/RDX was studied in this work. To this end, the CuO nanoparticles (NPs) are synthesized by the sol-gel method and applied as a nanocatalyst in thermal decomposition of RDX, as well as an oxidant in an Al-based nanothermite. The CuO NPs were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), and Brunauer-Emmett-Teller (BET). The XRD, FE-SEM, HRTEM, and BET images showed the excellent synthesis of spherical morphology of the CuO NPs with a mean size of 40.50 nm, and with surface area of approximately 25.98 m2/g. The reactivity was evaluated using thermogravimetry (TG) and differential scanning calorimetry (DSC), and the results show that the heat release of Al/CuO/RDX nanocomposite is 0.42 kJ/g more than that of pure RDX. It is shown, for the first time, that the electron transfer from Al/CuO nanothermite to –N–NO2 of RDX might play an important role in determining the catalytic properties of Al/CuO nanothermite.