Preferential crystallographic alignment in polycrystalline MnP

Booth, R. A.; Marinescu, M.; Liu, Jinfang; Majetich, Sara A.

doi:10.1016/j.jmmm.2010.03.022

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…Preparations of binary phosphides keep being improved and were achieved for several phases using a lithium metaphosphate melt (AlP, CrP, NbP, MoP, WP) or a solid-stated reduction route (Fe–P binary and ternary alloy powders) . Lastly, preferential magnetic alignments were studied in polycrystalline MnP samples …”

Section: Introductory Backgroundmentioning

confidence: 99%

Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives

et al. 2013

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Section: Introductory Backgroundmentioning

confidence: 99%

Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives

et al. 2013

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“…Metal phosphide (M x P y ) nanoparticles have gained attention because of their interesting performance in many applications such as energy storage, catalysis, optics, and magnetism, among others . Recently, Ni 2 P and CoP, among other metal phosphide nanoparticles, were shown to be excellent materials for the hydrogen evolution reaction (HER), which has resulted in a strong development in the last four years …”

Section: Introductionmentioning

confidence: 99%

The Birth of Nickel Phosphide Catalysts: Monitoring Phosphorus Insertion into Nickel

2017

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Tri‐n‐octylphosphine (TOP) is used widely as a phosphorating agent to yield metal phosphide nanocatalysts, which are receiving intense attention because of their high performance in both electrochemical and hydrotreatment catalytic processes, such as the hydrogen evolution reaction and the hydrodesulfurization reaction. We used in situ ambient‐pressure X‐ray photoelectron spectroscopy to investigate the formation of nickel phosphide on the surface of a nickel foil at temperatures close to those employed to form nickel phosphide nanoparticles in the colloidal route. We showed that the onset of phosphorus insertion into nickel occurs at as low as 150 °C, which is much lower than that reported previously (>210 °C). Moreover, the formation of sp2 carbon was observed on the surface as the consequence of TOP alkyl chain decomposition. These findings provide new insights into the surface chemistry of metal phosphide nanoparticles, which are increasingly employed in several fields of catalysis. Our results demonstrate that even below 150 °C, significant phosphorus and carbon incorporation can occur during metal nanoparticle syntheses if TOP is employed as the stabilizing agent.

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“…Metal phosphides are attracting a large amount of attention, as they have appealing properties in different areas of physics and chemistry . The applications extend from optics , to magnets , and for energy storage. , Among these applications, one of the fastest growing areas is the use of metal phosphides as catalysts. Initially, they were used in hydrotreatment and selective hydrogenations, − but nowadays, energy vector generation is the blooming area. − Particularly, growing attention has been put in the hydrogen evolution reaction (HER) of the Ni 2 P and CoP compositions, − but also on the H 2 production from BH 3 NH 3 . , These properties appear as a consequence of the modifications in the ensemble, and the electronic structure of these materials .…”

Section: Introductionmentioning

confidence: 99%

“…Metal phosphides are attracting a large amount of attention, as they have appealing properties in different areas of physics and chemistry. 1 The applications extend from optics 2,3 to magnets 4,5 and for energy storage. 6,7 Among these applications, one of the fastest growing areas is the use of metal phosphides as catalysts.…”

Section: ■ Introductionmentioning

confidence: 99%

Initial Stages in the Formation of Nickel Phosphides

Garcı́a-Muelas

López

2017

J. Phys. Chem. B

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Metal phosphides have emerged as a new powerful class of materials that can be employed as heterogeneous catalysts in transformations mainly to generate new energy vectors and the valorization of renewables. Synthetic protocols based on wet techniques are available and are based on the decomposition of the organic layer decorating the nanoparticles. For nickel, the phosphine of choice is trioctylphosphine, and this leads to the formation of NiP materials. However, the temperature at which the decomposition starts has been found to depend on the quality of the nickel surface. Density functional theory, DFT, holds the key to analyze the initial steps of the formation of these phosphide materials. We have found how clean nickel surfaces, either (111) or (100), readily breaks the ligand P-C bonds. This triggers the process that leads to the replacement of a surface nickel atom by P and concomintantly forms a Ni adatom on the surface surrounded by two methyl groups, thus starting the formation of the NiP phase. The whole process requires low energies, in agreement with the low temperature found in the experiments, 150 °C. In contrast, if the surface is oxidized, the reaction does not proceed at low temperatures and oxygen vacancies need to be created first to start the P-C bond breaking on the Ni-clean patches. Our results show that the cleaner the surface is, the milder the reactions are required for the NiP formation, and thus they pave the way for gentler synthetic protocols that can improve the control of these materials.

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Preferential crystallographic alignment in polycrystalline MnP

Cited by 7 publications

References 17 publications

Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives

Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives

The Birth of Nickel Phosphide Catalysts: Monitoring Phosphorus Insertion into Nickel

Initial Stages in the Formation of Nickel Phosphides

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