Magnetic and Electric Properties of FeP<sub>2</sub>Single Crystals

Boda, Gopal; Stenström, Bengt; Sagredo, V.; Beckman, O.; Carlsson, Bengt; Rundqvist, Stig

doi:10.1088/0031-8949/4/3/010

Cited by 30 publications

(27 citation statements)

References 5 publications

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“…The main peak with the binding energy of 707.9 eV was ascribed to Fe 2p 3/2 in FeP 2 . Considering that the structure of FeP 2 can be described as Fe‐centered octahedra and exhibiting diamagnetism at room temperature, we conclude that Fe takes the low‐spin d 6 configuration with a valence state of 2+ . The higher binding energy peaks located at around 709.7 and 711.5 eV corresponding to Fe oxide species such as Fe 2+ and Fe 3+ resulting from the surface oxidation of strained FeP 2 …”

Section: Resultsmentioning

confidence: 82%

“…[12,14] Considering that the structure of FeP 2 can be described as Fe-centered octahedra and exhibiting diamagnetism at room temperature, we conclude that Fe takes the low-spin d 6 configuration with a valence state of 2+. [15] The higher binding energy peaks located at around 709.7 and 711.5 eV corresponding to Fe oxide species such as Fe 2+ and Fe 3+ resulting from the surface oxidation of strained FeP 2 . [16] The electrochemical catalytic activities of the strained catalyst for the OER were explored with a three-electrode electrochemical cell in Ar-purified 1 m KOH electrolyte.…”

Section: Resultsmentioning

confidence: 99%

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In Situ Induction of Strain in Iron Phosphide (FeP₂) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

Yang

Rao

et al. 2020

Adv Funct Materials

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Carbon‐based materials have been widely used in heterogeneous catalysis because of their advantages of high surface area, thermal stability, and chemical inertness. However, their role in the catalysis is not fully understood although most studies conclude that the coupling between the carbon support and catalyst could reduce the charge transfer resistance and improve the kinetics of catalytic reactions such as water splitting. In this study, a carbon‐modified FeP2 electrocatalyst with a one‐step strategy is synthesized. The tensile strain is introduced in situ in the ab crystal plane of the FeP2 catalyst. This leads to charge redistribution between H and O atoms in the OH bonds and enhances the adsorption of reaction intermediates. In the water oxidation process, this results in a decrease in the energy barrier for the rate‐determining step, specifically, the chemical step of *OH adsorption preceded by one‐electron transfer. Benefiting from the optimized adsorption energy, the strained catalysts exhibit excellent oxygen evolution reaction (OER) activity with a low overpotential in addition to their increased stability. This study provides a new strategy for the introducing of strains in functional materials and provides new insights into the influence of carbon modification on OER activity.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

In Situ Induction of Strain in Iron Phosphide (FeP₂) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

Yang

Rao

et al. 2020

Adv Funct Materials

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“…This may be a result of CuP 2 having a semiconducting band gap (E g = 1.5 eV) 74 that is twice that of any of the other phosphides in this study. 42,56,58,75 Figure 2.9 Additional SEM images of CoP 3 synthesized from yellow P 4 (a and b) and red phosphorus (c) at 600°C.…”

Section: Phosphide Pellet Morphologiesmentioning

confidence: 99%

“…Iron diphosphide (FeP 2 ) is a diamagnetic n-type semiconductor with a band gap of 0.37 eV. 58 Its unit cell is orthorhombic in the Pnnm space group with a marcasite-type structure, and has a density of 5.107 g/cm 3 . The polyphosphide anions can be described as finite P 2 4dumbbells.…”

Section: Introduction To Thementioning

confidence: 99%

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Synthesis of transition-metal polyphosphides

Barry¹

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This dissertation describes the synthesis of several transition-metal polyphosphides including orthorhombic FeP 2 , cubic CoP 3 , cubic NiP 2 , monoclinic PdP 2 and monoclinic CuP 2. The investigation of these materials was initiated by the discovery of MP x formation upon reacting a metal halide with molecular yellow P 4 in superheated toluene. When these MP x products were annealed at moderate temperatures (350-500 °C), crystalline phosphorus-rich phases were produced. We found that these phases have been previously synthesized from high-temperature elemental reactions and that low temperature routes to these phase-pure polyphosphides using at least one non-elemental source were not found in the literature. The absence of low-temperature, "bottom up" routes to these materials encouraged us to investigate our initial findings further, as such methods provide unique chemical and structural flexibility in materials synthesis. Metal-rich counterparts to the aforementioned polyphosphides have been successfully produced via molecular solvothermal reactions. These reports consistently used an excess of phosphorus in their reactions but still afforded metal-rich products, and often produced materials with a combination of metal-rich and phosphorus-rich phases. These routes show the inability to dial in the phosphorus content of the produced MP x phases and so they were unable to use balanced stoichiometry to rationalize the chemistry, and rarely attempted to identify reaction byproducts. This prompted us to design a synthesis in which discrete amounts of a phosphorus reagent could be used to target specific compositions and phases and allow for byproduct identification. In order to determine reaction byproducts, a metal halide and yellow P 4 were reacted in together without solvent in sealed ampoules. The clear liquid byproduct was identified as PCl 3 or PBr 3 , indicating that stoichiometric and balanced reactions were possible. In these reactions, metal halides and phosphorus (red or yellow) were balanced such that the chloride was ideally removed has PCl 3 and any remaining phosphorus was used to form targeted, phase-pure MP x phases. Using this stoichiometry in solid-state reactions, all of the aforementioned polyphosphide phases were synthesized as phase pure products at moderate temperatures (500-700 °C). By pelletizing the metal halide reagents in reactions with yellow P 4 or by co-pelletizing the metal halide with red phosphorus, porous pellet products reminiscent of the reagent pellet could be afforded. The reaction stoichiometries used in solid-state reactions were adapted to solvothermal reactions. In these reactions, amorphous MP x products were synthesized from metal halides and yellow P 4 in various solvents (superheated toluene, 1-octadecene and hexadecane), and upon annealing (350-500 °C), targeted phase-pure CoP 3 , NiP 2 and CuP 2 were produced. Reactions substituting red phosphorus for yellow P 4 in hexadecane reactions also yielded the same crystalline phases. Solvothermal reactions were modified by...

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Synthesis of Phase‐Pure Ferromagnetic Fe₃P Films from Single‐Source Molecular Precursors

Colson¹,

Chen²,

Morosan³

et al. 2012

Adv Funct Materials

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A new method for the preparation of phase‐pure ferromagnetic Fe3P films on quartz substrates is reported. This approach utilizes the thermal decomposition of the single‐source precursors H2Fe3(CO)9PR (R = tBu or Ph) at 400 °C. The films are deposited using a simple, home‐built metal‐organic chemical vapor deposition (MOCVD) apparatus and are characterized using a variety of analytical methods. The films exhibit excellent phase purity, as evidenced by X‐ray diffraction, X‐ray photoelectron spectroscopy, and field‐dependent magnetization measurements, the results of which agree well with measurements obtained from bulk Fe3P. Using scanning electron microscopy and atomic force microscopy techniques, the films are found to have thicknesses between 350 and 500 nm with a granular surface texture. As‐deposited Fe3P films are amorphous, and little or no magnetic hysteresis is observed in plots of magnetization versus applied field. Annealing the Fe3P films at 550 °C results in improved crystallinity as well as the observation of magnetic hysteresis.

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Magnetic and Electric Properties of FeP₂Single Crystals

Abstract: Magnetic and electric properties of FePz single crystals.

Cited by 30 publications

References 5 publications

In Situ Induction of Strain in Iron Phosphide (FeP₂) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

In Situ Induction of Strain in Iron Phosphide (FeP₂) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

Synthesis of transition-metal polyphosphides

Synthesis of Phase‐Pure Ferromagnetic Fe₃P Films from Single‐Source Molecular Precursors

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Magnetic and Electric Properties of FeP2Single Crystals

Abstract: Magnetic and electric properties of FePz single crystals.

Cited by 30 publications

References 5 publications

In Situ Induction of Strain in Iron Phosphide (FeP2) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

In Situ Induction of Strain in Iron Phosphide (FeP2) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

Synthesis of transition-metal polyphosphides

Synthesis of Phase‐Pure Ferromagnetic Fe3P Films from Single‐Source Molecular Precursors

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Product

Resources

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Magnetic and Electric Properties of FeP₂Single Crystals

In Situ Induction of Strain in Iron Phosphide (FeP₂) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

In Situ Induction of Strain in Iron Phosphide (FeP₂) Catalyst for Enhanced Hydroxide Adsorption and Water Oxidation

Synthesis of Phase‐Pure Ferromagnetic Fe₃P Films from Single‐Source Molecular Precursors