Structural, morphological, luminescence, magnetic, and electrical transport properties of zinc-doped MnFe2O4 nanomaterials

Kumar, Deepak; Lincoln, Ch. Abraham; Ravinder, D.; Ahmad, Syed Ismail

doi:10.1007/s00339-020-03894-8

Cited by 28 publications

(10 citation statements)

References 56 publications

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“…The Zn 2p3/2 is deconvoluted into 1022 eV assigned to Zn 2+ state in ZnO crystal. Another peak at 1023 eV corresponds to interstitial Zn ions at a greater than +2 oxidation state and surrounded by more than one oxygen atom [54] . This proves that the valency of zinc does not change due to substitution of Ca 2+ ions with Zn 2+ .…”

Section: Resultsmentioning

confidence: 72%

“…Another peak at 1023 eV corresponds to interstitial Zn ions at a greater than + 2 oxidation state and surrounded by more than one oxygen atom. [54] This proves that the valency of zinc does not change due to substitution of Ca 2 + ions with Zn 2 + . The high XPS resolution also depicts similar peaks of Ca 2p and P 2p in both fresh and used ZnHAP.…”

Section: Chemistryselectmentioning

confidence: 68%

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Imine Oxidation Catalyzed by Zinc Hydroxyapatite: Kinetic Studies

et al. 2023

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The synthesis of N,N‐diphenylformamide from N‐benzylideneaniline and urea hydrogen peroxide is investigated using a zinc hydroxyapatite (ZnHAP) catalyst. It was found that the catalyst resulted in the highest activity of 91 % conversion and 40 % selectivity at 130 °C in 2 h. A kinetic model was validated by Langmuir‐Hinshelwood‐Hougen‐Watson (LHHW) at different temperatures and the absence of mass transfer resistance was proved by the Weisz Prater criterion. Effect of different catalysts, catalyst loading, temperature, mole‐ratio, and speed of stirring was studied. The as‐synthesized catalyst is characterized by FTIR, BET nitrogen adsorption‐desorption, TEM, EDX, TPD‐NH3, XPS, ICP‐MS and XRD. ZnHAP catalyst was found to be stable up to three recycles with no loss in activity.

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Section: Resultsmentioning

confidence: 72%

Section: Chemistryselectmentioning

confidence: 68%

Imine Oxidation Catalyzed by Zinc Hydroxyapatite: Kinetic Studies

et al. 2023

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“…However, the slight variation in the band position observed in the M–O tetrahedral stretching frequency in all of the metal-substituted ferrites supports the successful incorporation of metal ions (M 2+ ) in the tetrahedral sites of manganese ferrites. This can be explained by the fact that on introducing only 5% M 2+ ions having different ionic radii in the MnFe 2 O 4 structure, few Mn–O bonds will be substituted by the new M–O bond, and the new M–O bond’s length in tetrahedral sites will be changed in Mn 0.95 M 0.05 Fe 2 O 4 (M = Co, Cu, and Zn) …”

Section: Resultsmentioning

confidence: 99%

“…Synthesis of manganese ferrite (MnFe 2 O 4 ) and Mn 0.95 M 0.05 Fe 2 O 4 (M = Co, Cu, and Zn) was carried out using the combustion method. − In a typical synthesis of MnFe 2 O 4 , 2 mL of conc. HNO 3 was added to 1 mmol (0.245 g) of Mn(CH 3 COO) 2 ·4H 2 O in order to form manganese nitrate.…”

Section: Methodsmentioning

confidence: 99%

“…This can be explained by the fact that on introducing only 5% M 2+ ions having different ionic radii in the MnFe 2 O 4 structure, few Mn−O bonds will be substituted by the new M−O bond, and the new M−O bond's length in tetrahedral sites will be changed in Mn 0.95 M 0.05 Fe 2 O 4 (M = Co, Cu, and Zn). 39 Thermogravimetric analysis (TGA) was performed in an argon atmosphere in order to study the thermal stability of the specimens (Figure S1). The mass loss near 100 °C could be ascribed to removal of water adsorbed on the surface of all of the specimens.…”

Section: Preparation Of Electrolytesmentioning

confidence: 99%

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Transition-Metal-Substituted Nanoporous Manganese Ferrites Mn_0.95M_0.05Fe₂O₄ (M: Co, Cu, and Zn) as Electrode Materials for High-Performance Supercapacitors in Redox-Active Nonaqueous Electrolytes

et al. 2023

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Transition-metal-substituted manganese ferrites, Mn 0.95 M 0.05 Fe 2 O 4 (M: Co, Cu, and Zn), synthesized by the combustion method exhibit a single-phase cubic spinel structure. A maximum specific surface area (SA BET ) of 125 m 2 g −1 and a controlled pore size distribution (1.0 and 3.6 nm) and pore volume (0.17 cm 3 g −1 ) were estimated for Mn 0.95 Zn 0.05 Fe 2 O 4 . All of these ferrites are used as active electrode materials for electrochemical supercapacitor applications. The best specific capacitance (C sp ) and areal capacitance (C ar ) in nonaqueous electrolytes, i.e., 0.1 M lithium perchlorate/propylene carbonate (LiClO 4 /PC), were estimated for Mn 0.95 Zn 0.05 Fe 2 O 4 . Further, in order to understand the effect of redox additive electrolytes, the C sp and C ar for Mn 0.95 Zn 0.05 Fe 2 O 4 were measured in 0.1 M lithium perchlorate/propylene carbonate/tetraethylammonium tetrafluoroborate/ potassium iodide (LiClO 4 /PC/TEA-BF 4 /KI) along with non-redox-active electrolytes (LiClO 4 /PC). The electrodes were fabricated using Mn 0.95 Zn 0.05 Fe 2 O 4 with optimized mass and exhibited high C sp and C ar of 829 F g −1 and 1277 mF cm −2 , respectively, in a redox-active electrolyte as compared to lower values of 452 F g −1 and 696 mF cm −2 , respectively, at 1 mV s −1 , in a non-redox-active electrolyte. A symmetric pouch cell supercapacitor device (SPCSDR) fabricated using Mn 0.95 Zn 0.05 Fe 2 O 4 with a redox-active electrolyte (LiClO 4 /PC/TEA-BF 4 /KI) provides high energy (E) and power (P) densities of 77.5 W h kg −1 and 900 W kg −1 , respectively, at 0.5 A g −1 . The SPCSDR has demonstrated stability up to 8000 charge−discharge cycles with an initial C sp retention of ∼80% and high Coulombic efficiencies of ∼97−100%, at 2 A g −1 .

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FTIR, DC, and AC electrical measurements of Mg Zn Nano-ferrites and their composites with Polybenzoxazine

et al. 2021

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Structural, morphological, luminescence, magnetic, and electrical transport properties of zinc-doped MnFe2O4 nanomaterials

Cited by 28 publications

References 56 publications

Imine Oxidation Catalyzed by Zinc Hydroxyapatite: Kinetic Studies

Imine Oxidation Catalyzed by Zinc Hydroxyapatite: Kinetic Studies

Transition-Metal-Substituted Nanoporous Manganese Ferrites Mn_0.95M_0.05Fe₂O₄ (M: Co, Cu, and Zn) as Electrode Materials for High-Performance Supercapacitors in Redox-Active Nonaqueous Electrolytes

FTIR, DC, and AC electrical measurements of Mg Zn Nano-ferrites and their composites with Polybenzoxazine

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Structural, morphological, luminescence, magnetic, and electrical transport properties of zinc-doped MnFe2O4 nanomaterials

Cited by 28 publications

References 56 publications

Imine Oxidation Catalyzed by Zinc Hydroxyapatite: Kinetic Studies

Imine Oxidation Catalyzed by Zinc Hydroxyapatite: Kinetic Studies

Transition-Metal-Substituted Nanoporous Manganese Ferrites Mn0.95M0.05Fe2O4 (M: Co, Cu, and Zn) as Electrode Materials for High-Performance Supercapacitors in Redox-Active Nonaqueous Electrolytes

FTIR, DC, and AC electrical measurements of Mg Zn Nano-ferrites and their composites with Polybenzoxazine

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Transition-Metal-Substituted Nanoporous Manganese Ferrites Mn_0.95M_0.05Fe₂O₄ (M: Co, Cu, and Zn) as Electrode Materials for High-Performance Supercapacitors in Redox-Active Nonaqueous Electrolytes