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Cerium copper metal nanostructures have received extensive attention as promising electrode materials for energy storage applications due to its attractive structure, and good conductivity. Herein, CeO 2 -CuO nanocomposite was prepared via chemical method. The crystal structure, dielectric, and magnetic properties of the samples were characterized using by different techniques. The morphological properties of samples were inspected by field emission scanning electron microscopy (FE‒SEM) and high-resolution transmission electron microcopy (HR‒TEM) analysis implied an agglomerated with nanorod structure. The sample surface roughness and morphology were inspected using atomic force microscopy (AFM). Electron paramagnetic resonance (EPR) spectroscopy result reveals the oxygen insufficiency in the material. The variation of oxygen vacancies concentration is consistent with the changes of the saturation magnetization for the sample. Dielectric constant and dielectric losses were studied with respect to the temperature from range from 150 to 350 °C. The electrochemical study of CeO 2 -CuO nanocomposite shows clear oxidation and reduction peaks with covering wide potential range. In this present paper, first time we have demonstrated that the CeO 2 -CuO composite as an electron transport material (ETM) with copper (I) thiocyanate (CuSCN) as hole transport material (HTM) for the perovskite solar cells device fabrication. To understand the properties of perovskite like structural, optical, and morphological extensive characterizations such as XRD, UV-visible spectroscopy, and FE-SEM, was performed. For the first time, the CeO 2 -CuO was used as anode material for preparation low-temperature processing perovskite solar cells, results the power conversion efficiency (PCE) of 10.58% was achieved. The improvement in the device performance for the nanocomposite compared to the pure CeO 2 , due to unique properties of CeO 2 -CuO, including high hole mobility, good energy level alignment with CH 3 NH 3 PbI 3 and longer life time of photo-excited carriers for facilitating the developments of industrial-scale perovskite solar cells., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Electrochemical supercapacitor fabrication using heterogeneous nanocomposite is one of the most promising pathways for energy storage technology. Herein, heterostructure based nickel-molybdenum (NiO@Ni(OH) 2 -α-MoO 3 ) nanocomposites have been successfully prepared on nickel foil via hydrothermal route for supercapacitor application. The mixed phases of cubic, hexagonal, and orthorhombic crystal structure for NiO, Ni(OH) 2 , and α-MoO 3 , respectively were observed by X-ray diffraction. Heterostructures of nanosheet and nanosphere morphologies were confirmed by high resolution transmission electron microscopy. Impressively, the NiO@Ni(OH) 2 -α-MoO 3 composite working electrode exhibits a high specific capacitance of 445 Fg -1 at current density of 1 Ag -1 and shows outstanding rate capability (97.3% capacity retention after 3000 cycles at 10 Ag -1 ), compared to that of NiO@Ni(OH) 2 nanoparticles. Notably, two-electrode symmetric supercapacitor of NiO@Ni(OH) 2 -α-MoO 3 working electrode shows a high specific capacitance of 172 Fg -1 at 0.5 Ag -1 , excellent rate capability and good cycling stability. Also, an excellent cycling stability (capacity retention of 98% after 5000 cycles) is observed for NiO@Ni(OH) 2 -α-MoO 3 as a working electrode in the symmetric two-electrode system. The obtained attractive results demonstrate that nanocomposite anode material can be used for development of a wide-range of energy storage devices., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier Inc. All rights reserved.)

A CeO 2 -based heterostructure nanocomposite has been attractive as an electrode material for energy storage and as an electrochemical sensor. In the present work, a CeO 2 @NiO nanocomposite was prepared by a simple hydrothermal method. The structural and morphological information on the heterostructure CeO 2 @NiO nanocomposite were obtained by using different characterization methods like X-ray diffraction, UV-visible, Fourier transform infrared, electron paramagnetic resonance, Raman, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray elemental color mapping, X-ray photoelectron spectroscopy, and thermogravimetric analysis. Compared with pristine CeO 2 , the heterostructure CeO 2 @NiO nanocomposite exhibits a higher electrochemical performance with a specific capacitance of 317 F g -1 at a current density of 1 A g -1 in a 1 M KOH electrolyte. This device demonstrates a high energy density and a power density of 11 Wh kg -1 and 750 W kg -1 , respectively. Besides, it was found that CeO 2 @NiO/glassy carbon electrode (GCE) shows appreciable electrocatalytic activity toward NO 2 - oxidation. The CeO 2 @NiO-modified electrode displays a linear response for NO 2 - oxidation between 0.001 × 10 -6 and 4 × 10 -3 M. Apart from high sensitivity (2260 μA mM -1 cm -2 ), the CeO 2 @NiO-modified electrode also exhibits good selectivity and long-term stability for nitrite (NO 2 - ) detection in a water real sample, and the obtained results showed excellent recovery. The encouraging electrochemical performance of the CeO 2 @NiO nanocomposite provides a promising approach for the development of multifunctional electrode materials for future energy storage devices and sensors.