Study of the magnetocaloric effect in single-phase antiferromagnetic GdMnO3

Rasras, Anas; Hamdi, R.; Mansour, Said; Samara, Ayman; Haik, Yousef

doi:10.1016/j.jpcs.2020.109798

Cited by 14 publications

(8 citation statements)

References 43 publications

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“…The reliability of the refinement was assessed by the low values of the weighted profile ( R wp ) factor; the values are R wp = 4.23% for Fe 2 P and R wp = 3.20% for FeP. The processed data meet the established criteria ( R wp < 20%) for good refinement …”

Section: Resultsmentioning

confidence: 99%

“…The processed data meet the established criteria (R wp < 20%) for good refinement. 37 Characterization of iron phosphides was also carried out using Raman studies (Figure S2). The appearance of two prominent peaks at 1321 and 1583 cm −1 in the Raman spectra is assigned to the G (associated with the tangential stretching mode) and D (arising from the disordered hybridization carbon) bands of the graphitic structure, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Efficient Iron Phosphide Catalyst as a Counter Electrode in Dye-Sensitized Solar Cells

Yıldız

Chouki

Atli

et al. 2021

ACS Appl. Energy Mater.

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Developing an efficient material as a counter electrode (CE) with excellent catalytic activity, intrinsic stability, and low cost is essential for the commercial application of dye-sensitized solar cells (DSSCs). Transition metal phosphides have been demonstrated as outstanding multifunctional catalysts in a broad range of energy conversion technologies. Here, we exploited different phases of iron phosphide as CEs in DSSCs with an I–/I3 –-based electrolyte. Solvothermal synthesis using a triphenylphosphine precursor as a phosphorus source allows to grow a Fe2P phase at 300 °C and a FeP phase at 350 °C. The obtained iron phosphide catalysts were coated on fluorine-doped tin oxide substrates and heat-treated at 450 °C under an inert gas atmosphere. The solar-to-current conversion efficiency of the solar cells assembled with the Fe2P material reached 3.96 ± 0.06%, which is comparable to the device assembled with a platinum (Pt) CE. DFT calculations support the experimental observations and explain the fundamental origin behind the improved performance of Fe2P compared to FeP. These results indicate that the Fe2P catalyst exhibits excellent performance along with desired stability to be deployed as an efficient Pt-free alternative in DSSCs.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Efficient Iron Phosphide Catalyst as a Counter Electrode in Dye-Sensitized Solar Cells

Yıldız

Chouki

Atli

et al. 2021

ACS Appl. Energy Mater.

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“…The crystallite size and the intrinsic strain calculated using the Williamson−Hall (W−H) method yielded an average size of 18 ± 0.0010 nm and 4.5 × 10 −3 ± 0.0007 a.u., respectively (Text S1, Figure S1). The reliability of the refined fit was assessed by the weighted profile (R wp ) and Bragg (R b ) factor values that, at R wp = 4.23% and R b = 4.11%, met the established criteria (R wp < 20%) for good refinement [47]. The XRD pattern of the Fe 2 P catalyst (Figure S2) after the heating procedure (450 • C) was almost identical to that recorded for the initially synthesized Fe 2 P NPs.…”

Section: Characterization Of Fe 2 P Thin Filmsmentioning

confidence: 99%

Iron Phosphide Precatalyst for Electrocatalytic Degradation of Rhodamine B Dye and Removal of Escherichia coli from Simulated Wastewater

et al. 2022

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Electrocatalysis using low-cost materials is a promising, economical strategy for remediation of water contaminated with organic chemicals and microorganisms. Here, we report the use of iron phosphide (Fe2P) precatalyst for electrocatalytic water oxidation; degradation of a representative aromatic hydrocarbon, the dye rhodamine B (RhB); and inactivation of Escherichia coli (E. coli) bacteria. It was found that during anodic oxidation, the Fe2P phase was converted to iron phosphate phase (Fe2P-iron phosphate). This is the first report that Fe2P precatalyst can efficiently catalyze electrooxidation of an organic molecule and inactivate microorganisms in aqueous media. Using a thin film of Fe2P precatalyst, we achieved 98% RhB degradation efficiency and 100% E. coli inactivation under an applied bias of 2.0 V vs. reversible hydrogen electrode in the presence of in situ generated reactive chlorine species. Recycling test revealed that Fe2P precatalyst exhibits excellent activity and reproducibility during degradation of RhB. High-performance liquid chromatography with UV-Vis detection further confirmed the electrocatalytic (EC) degradation of the dye. Finally, in tests using Lepidium sativum L., EC-treated RhB solutions showed significantly diminished phytotoxicity when compared to untreated RhB. These findings suggest that Fe2P-iron phosphate electrocatalyst could be an effective water remediation agent.

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“…Because RMnO 3 materials have the same crystal structure and their magnetic phase diagrams can be controlled by modulating the effective R ion radius by partial substitution of lanthanoids, RMnO 3 nanoparticles are an excellent testbed to study the effect of R ion size on magnetic properties. Previous studies have reported that nanoparticles of DyMnO 3 with a particle size of 8.6–106 nm, , GdMnO 3 with a particle size of 52–270 nm, − and TbMnO 3 with a particle size of 25 nm to 3 μm − exhibited different behaviors from bulk crystals owing to changes in the particle size. In the case of RMnO 3 bulk crystals, the magnetic properties and crystal structure have been investigated as a function of lanthanoid ionic radius; however, to the best of our knowledge, there have been no reports comparing the size dependence of magnetic properties and the crystal structure of RMnO 3 nanoparticles with similar particle size (approximately 10 nm) and different R ions.…”

Section: Introductionmentioning

confidence: 98%

Characteristic Size Effects on the Crystallographic Structure and Magnetic Properties of RMnO₃ (R = Eu, Gd, Tb, Dy) Nanoparticles

et al. 2021

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We synthesized lanthanoid manganese oxide RMnO 3 (R = Eu, Gd, Tb, and Dy) nanoparticles with particle sizes ranging from approximately 6.5 to 23 nm and investigated both their crystal structure and magnetic properties. The RMnO 3 nanoparticles showed a strong correlation between crystal structure and magnetic properties, and particle size effects on these properties vary owing to the different atomic radii of the lanthanoid ions. The magnetic properties of all of the nanoparticles exhibited significant changes as the lattice constants changed at characteristic sizes that depend on the lanthanoid ionic radius; however, the characteristic size for magnetic properties corresponded to the magnitude of the orthorhombic distortion b/a = 1.10, regardless of the lanthanoid ionic radius. With decreasing particle size, EuMnO 3 , GdMnO 3 , and TbMnO 3 nanoparticles induced tensile strain of MnO 6 octahedra, whereas compressive strain occurred in DyMnO 3 nanoparticles. The deformation of MnO 6 octahedra changed the magnetic interactions, resulting in changes in the magnetic properties. As the particle size decreased, for R = Eu, Gd, and Tb, the magnetic properties, such as transition temperature, coercive field, and blocking temperature, decreased; conversely, these values increased in DyMnO 3 . The distortion of the unit cell induced changes in the magnetic ordering state due to decreasing particle size.

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Study of the magnetocaloric effect in single-phase antiferromagnetic GdMnO3

Cited by 14 publications

References 43 publications

Efficient Iron Phosphide Catalyst as a Counter Electrode in Dye-Sensitized Solar Cells

Efficient Iron Phosphide Catalyst as a Counter Electrode in Dye-Sensitized Solar Cells

Iron Phosphide Precatalyst for Electrocatalytic Degradation of Rhodamine B Dye and Removal of Escherichia coli from Simulated Wastewater

Characteristic Size Effects on the Crystallographic Structure and Magnetic Properties of RMnO₃ (R = Eu, Gd, Tb, Dy) Nanoparticles

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Study of the magnetocaloric effect in single-phase antiferromagnetic GdMnO3

Cited by 14 publications

References 43 publications

Efficient Iron Phosphide Catalyst as a Counter Electrode in Dye-Sensitized Solar Cells

Efficient Iron Phosphide Catalyst as a Counter Electrode in Dye-Sensitized Solar Cells

Iron Phosphide Precatalyst for Electrocatalytic Degradation of Rhodamine B Dye and Removal of Escherichia coli from Simulated Wastewater

Characteristic Size Effects on the Crystallographic Structure and Magnetic Properties of RMnO3 (R = Eu, Gd, Tb, Dy) Nanoparticles

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Product

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Characteristic Size Effects on the Crystallographic Structure and Magnetic Properties of RMnO₃ (R = Eu, Gd, Tb, Dy) Nanoparticles