Determination of the equilibrium miscibility gap in the Pd–Rh alloy system using metal nanopowders obtained by decomposition of coordination compounds

Shubin, Yu. V.; Plyusnin, P. E.; Коренев, С. В.

doi:10.1016/j.jallcom.2014.10.187

Cited by 23 publications

(9 citation statements)

References 36 publications

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“…3) indicate miscibility, in full agreement with our observation of the preference of Rh-core/Pd-shell atomic orderings over Janus-type ones with more separate Pd and Rh components. Interestingly, the Eexc values of 0.06 -0.09 eV per atom corresponding to the Pd : Rh ratios 1:3, 1:1 and 3:1 are close to the values calculated for nanoalloys with such well miscible atoms as Pd-Au [11][12][13][14].…”

Section: On the Mixing Of Pd And Rh Componentssupporting

confidence: 76%

“…Notably, core-shell atomic ordering of Pd and Rh components remains characteristic for the studied 201-atomic Pd-Rh NPs at all compositions. This deserves a closer look in view of the known immiscibility of Pd and Rh in bulk [11][12][13][14].…”

Section: Tablementioning

confidence: 99%

“…Pd-Rh NPs reveal remarkably easy surface restructuring under reaction conditions due to interactions with oxidizing and reducing environments [7][8][9] as well as with oxide supports [10]. Notably, Pd and Rh immiscible at low temperatures in bulk [11][12][13] can mix in NPs [3][4][5][6][7][8][9][10]14].…”

Section: Introductionmentioning

confidence: 99%

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Using density functional calculations to elucidate atomic ordering of Pd-Rh nanoparticles at sizes relevant for catalytic applications

Vega

Aleksandrov

Neyman

2019

Chinese Journal of Catalysis

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Section: On the Mixing Of Pd And Rh Componentssupporting

confidence: 76%

Section: Tablementioning

confidence: 99%

See 1 more Smart Citation

Using density functional calculations to elucidate atomic ordering of Pd-Rh nanoparticles at sizes relevant for catalytic applications

Vega

Aleksandrov

Neyman

2019

Chinese Journal of Catalysis

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“…Single-source precursors were proposed as starting materials for active metallic catalysts and porous metals [34]. Recently, several metallic phase diagrams were probed using samples prepared by precursors in mild conditions [35]. Here we report how pressure-dependent phase diagrams can be also probed using pre-specified binary metallic compositions prepared from single-source precursors.…”

Section: Discussionmentioning

confidence: 91%

Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation

et al. 2017

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The formation of the hcp-Ir 0.70 Re 0.30 alloy from the single-source precursor (NH 4) 2 [Ir 0.70 Re 0.30 Cl 6 ] upon heating in hydrogen atmosphere can be associated with the formation of two intermediates: a crystalline iridium-based intermediate and an fccstructured alloy. Ir-Re alloys show lower thermal expansion coefficients and smaller compressibility in comparison with individual metals. The high-temperature highpressure treatment of hcp-Ir 0.70 Re 0.30 alloy enable us to probe the Ir-Re pressure dependent phase diagram. The miscibility gap between hcp and fcc alloys slightly shifts towards the rhenium side below 4 GPa. Above 4 GPa, the miscibility gap does not drift with pressure and narrows with compression. The electrocatalytic activity of Ir-Re alloys has been tested for methanol oxidation in acidic water solution. Ir-Re alloys show higher electrocatalytic activity in comparison with pure Ir and Re, which makes them perspective candidates for fuel cells application. The highest electrocatalytic activity has been obtained for the two-phase Ir 0.85 Re 0.15 composition.

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“…This approach is based on reduction of double-complex salt crystals comprising an cation complex of one metal, [M′L′ x ] + , and a anion complex of a second metal, [M″L″ y ] ¯ (Scheme ). − Each unit cell in the double-complex salt crystals includes the two metal ions in a 1:1 ratio. Reduction of the double-complex salt crystals leads to evaporation of the inorganic ligands and reduction of the metal ions, inducing the formation of high surface area bimetallic nanoporous network (BNN).…”

Section: Introductionmentioning

confidence: 99%

Composition–Reactivity Correlations in Platinum–Cobalt Nanoporous Network as Catalyst for Hydrodeoxygenation of 5-Hydroxymethylfurfural

et al. 2019

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Identifying the influence of atomic order on the catalytic reactivity of bimetallic catalysts is essential for their rational design. However, the synthesis of atomically ordered nanostructures under mild conditions is not trivial, and in many cases a mixture of various compositions is formed. Here we show a simple and highly versatile approach for synthesis of Pt–Co bimetallic nanoporous network (BNN) and demonstrate the influence of preparation conditions on the BNN’s atomic order and catalytic reactivity. High surface area Pt3Co BNN was prepared by reduction of [Co(NH3)5Cl][PtCl4] double complex salt crystals. The BNN phase was transformed from Pt3Co to segregated Pt and Co domains once the reduction temperature of the double complex salt crystals was elevated. High selectivity toward hydrodeoxygenation of biomass-derived 5-hydroxymethylfurfural to 2,5-dimethylfuran was obtained while catalyzing the reaction with Pt3Co BNN. The catalytic yield was deteriorated by more than an order of magnitude while catalyzing the reaction with BNN that was constructed of segregated Pt and Co domains. Spectroscopic analysis identified the presence of an oxidized Co species and a metallic Pt species in a close to 1:1 ratio on the Pt3Co BNN surface as crucial factors in lowering the activation energy of the dehydration reaction.

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Determination of the equilibrium miscibility gap in the Pd–Rh alloy system using metal nanopowders obtained by decomposition of coordination compounds

Cited by 23 publications

References 36 publications

Using density functional calculations to elucidate atomic ordering of Pd-Rh nanoparticles at sizes relevant for catalytic applications

Using density functional calculations to elucidate atomic ordering of Pd-Rh nanoparticles at sizes relevant for catalytic applications

Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation

Composition–Reactivity Correlations in Platinum–Cobalt Nanoporous Network as Catalyst for Hydrodeoxygenation of 5-Hydroxymethylfurfural

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