Influence of transition metals co-doping on CeO2 magnetic and photocatalytic activities

Subramanyam, K.; Sreelekha, N.; Reddy, D. Amaranatha; Ramanadha, M.; Poornaprakash, B.; Reddy, K. Chandrasekhar; Vijayalakshmi, R.P.

doi:10.1016/j.ceramint.2019.10.252

Cited by 23 publications

(7 citation statements)

References 67 publications

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“…These results are very close to that investigated by energydispersive X-Ray diffraction with phase transition pressure of 31.5 GPa [13]. Later, the properties of CeO 2 have been developed by doping transition metals and searching the candidate material, which has great potential for applications in spintronic and multifunctional electronic devices [14][15][16][17][18][19]. The structural and physical properties of the CeO 2 doped with Fe have been investigated by previous studies [20][21][22][23][24].…”

Section: Introductionsupporting

confidence: 75%

Fe-doped effects on phase transition and electronic structure of CeO2 under compressed conditions from ab initio calculations

et al. 2021

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Ab initio study of high-pressure phase transition and electronic structure of Fe-doped CeO2 with Fe concentrations of 3.125, 6.25, and 12.5 at% has been reported. At a constant-pressure consideration, the lattice constants and the volume of the supercell were decreased with an increasing concentration of Fe. The average bond length of Fe–O is lower than that of Ce–O. As a result, Fe doping induces the reduced volume of the cell, which is in good agreement with previous experiments. At high pressure (~ 30 GPa), it was found that the transition pressure from the fluorite to the cotunnite orthorhombic phase decreases at a higher concentration of Fe, indicating that the formation energy of the compound is induced by Fe-doping. Furthermore, compression leads to interesting electronic properties too. Under higher pressures, the bandgap increases in the cubic structure under compression and then suddenly plummets after the transition to the orthorhombic phase. The 3d states of Fe mainly induced the impurity states in the bandgap. In both the undoped and Fe-doped systems, the bandgap increased in the cubic phase at high pressure, while the gap and p-d hybridization decrease in the orthorhombic phase.

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Section: Introductionsupporting

confidence: 75%

Fe-doped effects on phase transition and electronic structure of CeO2 under compressed conditions from ab initio calculations

et al. 2021

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“…Therefore, photocatalytic nanomaterials are the best candidates for degrading hazardous pollutants, as they can fully mineralize them into CO 2 and H 2 O without any byproducts . Semiconductor catalysts have commonly been used for the degradation of dyes from wastewater, e.g., metal oxides/sulfides/nitrides, etc . Among these semiconducting materials, metals and metal oxides have been the most attractive for several reasons .…”

Section: Introductionmentioning

confidence: 99%

“… 6 Semiconductor catalysts have commonly been used for the degradation of dyes from wastewater, e.g., metal oxides/sulfides/nitrides, etc. 7 Among these semiconducting materials, metals and metal oxides have been the most attractive for several reasons. 8 In addition to the simple metallic oxides, many researchers have reported that noble metal nanoparticles are excellent catalysts due to the presence of surface plasmon-driven catalysis, which can be further developed as suggested by various co-workers.…”

Section: Introductionmentioning

confidence: 99%

Role of Different Fuels and Sintering Temperatures in the Structural, Optical, Magnetic, and Photocatalytic Properties of Chromium-Containing Nickel Ferrite: Kinetic Study of Photocatalytic Degradation of Rhodamine B Dye

et al. 2023

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In the present paper, nanocrystalline samples of NiCrFeO4 were synthesized by the combustion method using different fuels such as glycine, urea, and poly(vinyl alcohol) and subjected to heat treatment at different temperatures of 600, 700, 800, and 1000 °C for 6 h. The formation of phases with highly crystalline structures was confirmed by XRD and Rietveld refinement analysis. The optical band gap of NiCrFeO4 ferrites lies in the visible range, making them suitable photocatalysts. BET analysis reveals that the surface area of the phase synthesized using PVA is much higher than that synthesized using other fuels at each sintering temperature. In addition, there is a significant decrease in the surface area with sintering temperature for the catalysts prepared using the fuels PVA and urea, while it almost remains constant in the case of glycine. Magnetic studies demonstrate the dependence of saturation magnetization on the nature of the fuel and on the sintering temperature; moreover, the coercivity and squareness ratio confirm the single domain nature of all the synthesized phases. We have also performed photocatalytic degradation of the highly toxic Rhodamine B (RhB) dye by employing all the prepared phases as photocatalysts using the mild oxidant H2O2. It is observed that the photocatalyst prepared using PVA as the fuel exhibited the best photocatalytic activity at all sintering temperatures. All the three photocatalysts prepared using different fuels showed a decrease in the photocatalytic activity with increasing sintering temperature. From the chemical kinetic point of view, the degradation of RhB by all the photocatalysts was found to follow pseudo-first-order kinetics.

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“…[15] Removing dyes from wastewater has frequently been accomplished using semiconductor catalysts, such as metal oxides/nitrides/sulfides, etc. [16] Metal-organic frameworks (MOFs) are hollow crystalline hybrid materials consist of organic linkers and core transition metal ions with extremely large surface areas and tunable pore sizes. [17] These materials drawn interest from researchers worldwide because of their structural variety, chemical stability, tunable topology in addition to good electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Metal Organic Framework Derived Spinel Nickel‐Ferrites Employing Reduced Graphene Oxide Template for Supercapacitor and Photocatalytic Dye Degradation

Jakhar,

Singh,

Selva Kumar

et al. 2024

ChemistrySelect

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Spinel oxides from transition metals are the most crucial components for producing supercapacitive electrodes and photocatalytic semiconductor materials. However poor electrical conductivity and restricted specific energy of these materials are two main drawbacks for energy storage applications. This investigation used reduced graphene oxide templated spinel nickel ferrites nanoparticles (RGO@SNFs), synthesized using Fe2Ni MIL‐88 MOF via hydrothermal conditions followed by a pyrolysis process. The structural properties and morphology of the hybrid are characterized through several methods, including XRD, FTIR, BET‐PSD, and FESEM. Superconducting electrochemical studies such as Galvano static charge‐discharge, impedance spectroscopy and cyclic voltammetry are carried out on a hybrid electrode to examine the impact of the RGO template on SNF nanoparticles. This electrode may be an alluring choice for supercapacitor applications because of its capacitance 115 F/g and retention rate of approximately 95 % following 2000 cycles. Additionally, a model dye degradation process utilizing Rhodamine B (RhB) was used to examine the photodegradation action of these materials. The designed catalyst also represents excellent photo‐degradation activity toward RhB, and seventy‐five minutes of sun light were enough to destroy about 99 % of the dye.

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Influence of transition metals co-doping on CeO2 magnetic and photocatalytic activities

Cited by 23 publications

References 67 publications

Fe-doped effects on phase transition and electronic structure of CeO2 under compressed conditions from ab initio calculations

Fe-doped effects on phase transition and electronic structure of CeO2 under compressed conditions from ab initio calculations

Role of Different Fuels and Sintering Temperatures in the Structural, Optical, Magnetic, and Photocatalytic Properties of Chromium-Containing Nickel Ferrite: Kinetic Study of Photocatalytic Degradation of Rhodamine B Dye

Metal Organic Framework Derived Spinel Nickel‐Ferrites Employing Reduced Graphene Oxide Template for Supercapacitor and Photocatalytic Dye Degradation

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