Enhanced dielectric and supercapacitive properties of spherical like Sr doped Sm2O3@CoO triple oxide nanostructures. (January 2023)

• Record Type: Journal Article
• Authors: Adimule, Vinayak; Batakurki, Sheetal; Bhat, Vinay S.; Yallur, Basappa C.; Hegde, Gurumurthy; Bathula, Chinna
• Is Part Of: Journal of energy storage. Volume 57(2023)
• Publication Date: 2023-01
• Subjects: Srx:Sm2O3@CoO -- Nanostructures -- Dielectric properties -- Optical -- Morphology -- Supercapacitors; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.106318
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Integrating the hybrid nanostructures exhibiting enhanced storage and electrical properties requires tuning of composition of constituents. To address this issue, we prepared Sr 2+ nanoparticles (NPs) decorated over Sm2 O3 @CoO nanostructures (NS) by chemical precipitation. The structure integrity of the composite was determined by analytical tools. Based on the strongest peak of X-ray diffraction (XRD), crystallite size of the nanoparticles was determined to be 26.14 nm, indicating a mixed phase of monoclinic and tetragonal crystal formation. FESEM revealed a spherical-like morphology with a homogeneous distribution of microstructures with average sizes ranging from 68 nm to 60 nm. The optical absorptivity revealed a redshift in absorption bands centred at 337.0 nm, 343.9 nm, and 353.0 nm in UV-region. The optical band gap of NS was found to be in the range of 3.38 eV to 3.15 eV, and the BET surface area of Sr15% :Sm2 O3 @CoO was found to be 458–469 cm 2 /g with a corresponding pore size of 13.17 nm. All Sr-doped Sm2 O3 @CoO NS exhibited higher ionic conductivity and dielectric constant than undoped material. In an aqueous KOH electrolyte, the NS showed a specific capacity of 234.2C/g (65.1mAh/g) demonstrating the material as potential candidate in energy storage and dielectrics. Graphical abstract: Unlabelled Image Highlights: Sr 2+ modified Sm2 O3 @CoO nanostructures were prepared by chemical precipitation method. Sr 2+ promoted the formation of spherical microstructure and redshift in optical absorption spectrum. Sr 2+ doped Sm2 O3 @CoO showed enhanced dielectric property, ionic conductivity under the influence of γ-irradiation. Sr10% :Sm2 O3 @CoO explored 234.2 F/g at 0.1A/g in GCD with EIS of 20.83 mF.