Dielectric performance of CeO2/ZnO core–shell nanocomposite with their structural, optical and morphological properties

Srinivasan, M.; Uthiram, C.; Ayeshamariam, A.; Kaviyarasu, K.; Punithavelan, N.

doi:10.1016/j.jksus.2022.102508

Cited by 11 publications

(2 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The weak peak at 1444 cm −1 is assigned for the C-H asymmetric and symmetric bending vibrations, while the strong one can be attributed to Zn-O bonds. The small bands between 400 and 1062 cm −1 prove that the ZnO absorption band has a stretching mode of Zn-O, corresponds to the hexagonal ZnO crystal structure 25 . From the FTIR spectrum of the AC loaded with MR and MO dye molecules (Fig.…”

Section: Characterization Of Ac and Zno@ac Compositementioning

confidence: 87%

ZnO@ activated carbon derived from wood sawdust as adsorbent for removal of methyl red and methyl orange from aqueous solutions

Sayed,

Ahmed,

Abdallah

et al. 2024

Sci Rep

View full text Add to dashboard Cite

Activated carbon (AC) and ZnO@AC composite derived from wood sawdust were prepared to be utilized as adsorbents for methyl red (MR) and methyl orange (MO) anionic dyes from the aqueous solutions. The maximum adsorption capacity of the AC and ZnO@AC composite toward both dyes was achieved in the strong acidic medium (pH = 3), and under stirring for 60 min. The kinetic studies revealed that the adsorption of MR and MO dyes onto the AC and ZnO@AC composite fitted well with the pseudo-second-order model. Furthermore, the intraparticle diffusion and Elovich kinetic models confirmed the adsorption is controlled by external surfaces, and the adsorption is chemisorption process. The isotherm results indicated that the MR and MO dye adsorption occurred via monolayer adsorption, and the estimated maximum adsorption capacities of both dyes onto the ZnO@AC composite were higher than those achieved by AC. Thermodynamic analysis suggested that the adsorption is endothermic and spontaneous. The mechanism for MR, and MO dyes adsorption onto the AC and ZnO@AC composite is proposed to be controlled by electrostatic bonding, π–π interactions, and ion exchange, while H-bonding and n–π interactions were minor contributors. This study reveals the potential use of carbon-based adsorbents derived from wood sawdust for the removal of anionic dyes from wastewater.

show abstract

Section: Characterization Of Ac and Zno@ac Compositementioning

confidence: 87%

ZnO@ activated carbon derived from wood sawdust as adsorbent for removal of methyl red and methyl orange from aqueous solutions

Sayed,

Ahmed,

Abdallah

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Nickel sulfides and oxides can be synthesized by co-precipitating hexadecylamine and calcination. This work also discusses the optical properties and morphology of the synthesized nanoparticles to determine their redox behaviors [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic and electrochemical performance of hydrothermally prepared NiO‐doped Co nanocomposites

Venkatachalapathy,

Sambathkumar,

Rajasaravanan

et al. 2024

Luminescence

View full text Add to dashboard Cite

In this study, we synthesize nanostructured nickel oxide (NiO) and doped cobalt (Co) by combining nickel(II) chloride hexahydrate (NiCl2.6H2O) and sodium hydroxide (NaOH) as initial substances. We analyzed the characteristics of the product nanostructures, including their structure, optical properties, and magnetic properties, using various techniques such as x‐ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet absorption spectroscopy (UV–Vis), Fourier transform infrared (FTIR) spectroscopy, and vibrating sample magnetometers (VSM). The NiO nanoparticles doped with Co showed photocatalytic activity in degrading methylene blue (MB) dye in aqueous solutions. We calculated the degradation efficiencies by analyzing the UV–Vis absorption spectra at the dye's absorption wavelength of 664 nm. It was observed that the NiO‐doped Co nanoparticles facilitated enhanced recombination and migration of active elements, which led to more effective degradation of organic dyes during photocatalysis. We also assessed the electrochemical properties of the materials using cyclic voltammetry (CV) and impedance spectroscopy in a 1 mol% NaOH solution. The NiO‐modified electrode exhibited poor voltammogram performance due to insufficient contact between nanoparticles and the electrolyte solution. In contrast, the uncapped NiO's oxidation and reduction cyclic voltammograms displayed redox peaks at 0.36 and 0.30 V, respectively.

show abstract

Enhanced Electrochemical Performance of Highly Porous CeO₂‐Doped Zr Nanoparticles for Supercapacitor Applications

Arularasu,

Rajendran,

Arkook

et al. 2024

Microscopy Res & Technique

View full text Add to dashboard Cite

The aim of this work was to develop an ultrasonic‐assisted synthesis method for the fabrication of CeO2‐doped Zr nanoparticles that would improve the performance of supercapacitor electrodes. This method, which eliminates the need for high‐temperature calcination, involves embedding CeO2 into Zr nanoparticles through 1 hr (CeO2‐Zr‐1) and 2 hrs (CeO2‐Zr‐2) of ultrasonic irradiation, resulting in the formation of nanostructures with significant improvements in their electrochemical properties. Through physicochemical analysis, we observed that the CeO2‐doped Zr nanoparticles, particularly those treated for 2 hrs (CeO2‐Zr‐2), exhibit superior crystalline phase purity, optimal chemical surface composition, minimal agglomeration with particle sizes below 50 nm, and an impressive average surface area of 178 m2/g. Compared to the 1 hr irradiation samples (CeO2‐Zr‐1) and undoped CeO2 nanoparticles, the (CeO2‐Zr‐2) electrodes demonstrated a remarkable capacitance of 198 Fg−1 at a current density of 1 A/g while maintaining ~94.9% of their capacity after 3750 cycles. This indicates not only good reversibility but also exceptional stability. In (CeO2‐Zr‐2) samples, the nanospherical structure achieved through ultrasonic synthesis is responsible for the enhanced capacitive behavior and stability, along with the synergistic effects caused by Zr doping, which improves the CeO2 nanoparticle conductivity to a significant extent. Surface areas of the electrodes are larger due to the combination of these two materials, which contribute to their superior performance.

show abstract

Dielectric performance of CeO2/ZnO core–shell nanocomposite with their structural, optical and morphological properties

Cited by 11 publications

References 36 publications

ZnO@ activated carbon derived from wood sawdust as adsorbent for removal of methyl red and methyl orange from aqueous solutions

ZnO@ activated carbon derived from wood sawdust as adsorbent for removal of methyl red and methyl orange from aqueous solutions

Enhanced photocatalytic and electrochemical performance of hydrothermally prepared NiO‐doped Co nanocomposites

Enhanced Electrochemical Performance of Highly Porous CeO₂‐Doped Zr Nanoparticles for Supercapacitor Applications

Contact Info

Product

Resources

About

Dielectric performance of CeO2/ZnO core–shell nanocomposite with their structural, optical and morphological properties

Cited by 11 publications

References 36 publications

ZnO@ activated carbon derived from wood sawdust as adsorbent for removal of methyl red and methyl orange from aqueous solutions

ZnO@ activated carbon derived from wood sawdust as adsorbent for removal of methyl red and methyl orange from aqueous solutions

Enhanced photocatalytic and electrochemical performance of hydrothermally prepared NiO‐doped Co nanocomposites

Enhanced Electrochemical Performance of Highly Porous CeO2‐Doped Zr Nanoparticles for Supercapacitor Applications

Contact Info

Product

Resources

About

Enhanced Electrochemical Performance of Highly Porous CeO₂‐Doped Zr Nanoparticles for Supercapacitor Applications