Synthesis and Characterization of Nano CuO-NiO Mixed Oxides

Abstract

A series of single and mixed oxides of nano CuO-NiO were prepared by thermal decomposition of the NiC 2 O 4 .2H 2 O and/or CuC 2 O 4 precursors which obtained via the reaction between alcoholic metal nitrates and oxalic acid solutions. Thermal behavior of the single and mixed salts has been studied using thermal analysis (TG and DTA). Thermal products were characterized using Fouier transform infrared (FTIR), X-ray diffraction (XRD), Electron microscopy (SEM&TEM), Nitrogen adsorption at -196 o C and surface excess oxygen measurements. The results revealed that, pure NiC 2 O 4 .2H 2 O and CuC 2 O 4 decomposed at 355 and 325 o C, respectively. Also, it was found that the addition of NiO to CuO brought a significant increase in the degree of crystallinity of the mixed oxides which is accompanying with an increase in their particle size and a decrease in the surface area. Moreover, addition of NiO to CuO, also reduces the amount of surface excess oxygen of CuO due to a synergistic effect.

Synthesis of Nickel Oxide Nanoparticles and Copper-Doped Nickel Oxide Nanocomposites Using Phytolacca dodecandra L’Herit Leaf Extract and Evaluation of Its Antioxidant and Photocatalytic Activities

“…The gathered data matched the standard pattern (JCPDS # 96-901-4581). The additional peaks obtained at 35.74, 48.87, and 68.34° correspond to copper; this is identical with the reported literature . XRD of copper-doped NiO can have a pattern related to the presence of copper as revealed by the literature …”

“…It is clear from Figure 6 that no other characteristic peaks due to any impurities and sharp peaks are present in the pattern, indicating that the prepared samples are of high purity and crystallinity. The Bragg peaks were obtained at 2θ values of 43 The average sizes of the synthesized NiO NPs and Cu−NiO NCs calculated using the Scherrer formula from the data of the X-ray diffraction (XRD) pattern are 14.18 and 16.10 nm, respectively. The crystallite size was found to increase with the doping of Cu in NiO because the ionic radius of Cu is bigger than that of Ni (Cu = 0.082 nm > Ni = 0.078 nm).…”

Highly porous Co-doped NiO nanorods: facile hydrothermal synthesis and electrocatalytic oxygen evolution properties

“…On further increasing the temperature, the second step showing ca 44.49% of weight loss in the range of 230-500°C with a sharp exotherm at 324°C in DTA curves was observed. It is assignable to the decomposition reaction of anhydrous nickel oxalate into nickel oxide (equation (3.2)) [31][32][33]. No other peak was observed beyond 500°C, implying the complete decomposition of precursor NiC 2 O 4 • 2H 2 O nanorods into porous NiO nanorods.…”

“…No other peak was observed beyond 500°C, implying the complete decomposition of precursor NiC 2 O 4 • 2H 2 O nanorods into porous NiO nanorods. The thermal decomposition process can be explained by the following equations [32]:…”

Ce1−xCoxOynanocatalysts: synthesis, characterization and environmental application

“…The efficient dispersion of Co in the Ce lattice (confirmed by XRD) can be directly related to the formation of ion pairs via a synergistic mechanism, which leads to enhanced redox properties. 68,69 Fourth, Ce 1−x Co x O y nanocatalysts exhibited remarkably high surface area and pore volume, as evidenced by N 2 sorption analysis. High surface area and porosity provide a high number of active sites, which facilitate the contact between the reactant molecules and the catalyst surface.…”