Synthesis of ((CeO2)0.8(Sm2O3)0.2)@NiO Core-Shell Type Nanostructures and Microextrusion Printing of a Composite Anode Based on Them

Abstract

The process of the hydrothermal synthesis of hierarchically organized nanomaterials with the core-shell structure with the composition ((CeO2)0.8(Sm2O3)0.2)@NiO was studied, and the prospects for their application in the formation of planar composite structures using microextrusion printing were shown. The hydrothermal synthesis conditions of the (CeO2)0.8(Sm2O3)0.2 nanospheres were determined, and the approach to their surface modification by growing the NiO shell with the formation of core-shell structures equally distributed between the larger nickel(II) oxide nanosheets was developed. The resulting nanopowder was used as a functional ink component in the microextrusion printing of the corresponding composite coating. The microstructure of the powders and the oxide coating was studied by scanning (SEM) and transmission electron microscopy (TEM), the crystal structure was explored by X-ray diffraction analysis (XRD), the set of functional groups in the powders was studied by Fourier-transform infrared spectroscopy (FTIR) spectroscopy, and their thermal behavior in an air flow by synchronous thermal analysis (TGA/DSC). The electronic state of the chemical elements in the resulting coating was studied using X-ray photoelectron spectroscopy (XPS). The surface topography and local electrophysical properties of the composite coating were studied using atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). Using impedance spectroscopy, the temperature dependence of the specific electrical conductivity of the obtained composite coating was estimated.

Hydrothermal Synthesis of a Cellular NiO Film on Carbon Paper as a Promising Way to Obtain a Hierarchically Organized Electrode for a Flexible Supercapacitor

“…values of this parameter for carbon fibers (4.95 eV) [53]or carbon nanoparticles (4.90-5.05 eV) [54,55], but very close to the work function values for nickel oxide obtained using the hydrothermal synthesis techniques that we use: 4.75 eV [56] and 4.70 eV [57]. In this connection, the results obtained by the AFM method demonstrate that a sufficiently homogeneous cellular film of nickel oxide was formed on almost the entire carbon fiber surface in hydrothermal conditions which, in some areas, tightly adheres to the carbon fiber surface and completely follows its topography.…”

“…The results indicate a high conductivity of the material, i.e., the nickel oxide film does not act as a significant barrier to charge transfer over the surface of the formed NiO/CP composite electrode. The work function value of the material surface calculated using the surface potential distribution map was 4.73 eV, which is slightly lower than the traditional values of this parameter for carbon fibers (4.95 eV) [53] or carbon nanoparticles (4.90-5.05 eV) [54,55], but very close to the work function values for nickel oxide obtained using the hydrothermal synthesis techniques that we use: 4.75 eV [56] and 4.70 eV [57]. In this connection, the results obtained by the AFM method demonstrate that a sufficiently homogeneous cellular film of nickel oxide was formed on almost the entire carbon fiber surface in hydrothermal conditions which, in some areas, tightly adheres to the carbon fiber surface and completely follows its topography.…”

Hydrothermal Synthesis of Nickel Oxide and Its Application in the Additive Manufacturing of Planar Nanostructures

“…In order to further develop the NiO—(CeO 2 ) 0.80 (Sm 2 O 3 ) 0.20 composite electrode film, the corresponding functional inks were prepared based on the obtained nanopowder of nickel oxide (sample 2) and previously synthesized oxide of (CeO 2 ) 0.80 (Sm 2 O 3 ) 0.20 composition [ 82 ] in a 50:50 wt.% ratio, to which α-terpineol was added as a solvent (ethylcellulose, 20 wt.% was used as a binder). The total mass fraction of oxide particles in the composition of the obtained composite functional ink was 15%.…”

Multioxide combinatorial libraries: fusing synthetic approaches and additive technologies for highly orthogonal electronic noses

“…50,51 The hydrothermal method allows making materials with more complex morphologies, including coreshell structures with unique properties, because of fine control of the microstructural transformation of solid-phase particles. 52 Combining these methods helps to overcome their weak points, enhance their capabilities, and further expand the range of possible synthetic technologies, enabling the production of materials with improved properties.…”