Thermodynamic Modeling of the Pt-Te and Pt-Sb-Te Systems

Guo, Cuiping; Huang, Liang; Li, Changrong; Shang, Shun‐Li; Du, Zhenmin

doi:10.1007/s11664-015-3676-x

Cited by 6 publications

(5 citation statements)

References 20 publications

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“…17 Besides the mostly studied layered chalcogenides, other chalcogen-poor compositional phases may exist in the Pt-Se or Pt-Te phase diagrams. 30,31 Such phases have also been predicted to exhibit electrocatalytic properties, 32 but a controlled synthesis of Ptchalcogenides with different compositions has not been well documented. It has, however, been shown that the CVD growth of Pt-telluride may result in PtTe or PtTe 2 depending on the growth conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Potential practical uses of Pt-chalcogenides have been discussed , ranging from applications as electrodes for electrocatalysis, − pressure, or gas sensors , to electronic − and opto-electronic applications . Besides the mostly studied layered chalcogenides, other chalcogen-poor compositional phases may exist in the Pt-Se or Pt-Te phase diagrams. , Such phases have also been predicted to exhibit electrocatalytic properties, but a controlled synthesis of Pt-chalcogenides with different compositions has not been well documented. It has, however, been shown that the CVD growth of Pt-telluride may result in PtTe or PtTe 2 depending on the growth conditions .…”

Section: Introductionmentioning

confidence: 99%

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Thermal Phase Control of Two-Dimensional Pt-Chalcogenide (Se and Te) Ultrathin Epitaxial Films and Nanocrystals

Kolekar

Xin

et al. 2021

Chem. Mater.

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The controlled synthesis and modification of the composition of layered compounds are essential prerequisites for their deployment in electronic or chemical applications. Pt-chalcogenides exhibit various compositional phases. Here, we investigate how Pt-selenide and Pt-telluride phases can be obtained as ultrathin films or as supported nanocrystals by physical vapor deposition and thermal treatment. The films are characterized by scanning tunneling microscopy and spectroscopy, scanning transmission electron microscopy, and photoemission and Raman spectroscopy. In all cases, Pt-dichalcogenides are obtained by Pt and chalcogen codeposition at growth temperatures below 300 °C. These films can be grown by van der Waals epitaxy in a layer-by-layer fashion, enabling the characterization of the pronounced layer-dependent electronic properties of these compounds. Pt-telluride growth at elevated temperatures (above 400 °C) results in the formation of Pt-monotelluride. Interestingly, the thin film Pt-dichalcogenides can also be transformed into different phases with lower chalcogen concentration by post-growth vacuum annealing. Annealing-induced loss of chalcogen results in new composites. With this thermal process, an intermittent layered compound of Pt3Te4 is synthesized, which consists of alternating PtTe2 and PtTe van der Waals layers. By thermal treatment of PtSe2, we obtain a non-layered Pt-monoselenide in nanocrystalline form. PtSe is not reported in the bulk Pt-Se phase diagram, but its structure is analogue to the known Pt-monosulfide with a tetragonal unit cell. This PtSe phase is semiconducting with a band gap of ∼0.9 eV. The nanocrystalline PtSe phase is, however, unstable and easily loses more Se and eventually converts into Pt. Thus, it is demonstrated that post-growth thermally induced transformation of Pt-dichalcogenides films enables the synthesis of new Pt-chalcogenide phases as ultrathin films or nanocrystals.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Phase Control of Two-Dimensional Pt-Chalcogenide (Se and Te) Ultrathin Epitaxial Films and Nanocrystals

Kolekar

Xin

et al. 2021

Chem. Mater.

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“…Note that the direct tellurization of Pt layer will produce PtTe 2 instead of Pt 3 Te 4 as the enthalpy of formation of PtTe 2 is the lowest in the Pt–Te system. 29 , 30 …”

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confidence: 99%

“…Furthermore, such synthesis procedure is unsuitable for large-scale production and fails in reproducibility, due to its complexity. Note that the direct tellurization of Pt layer will produce PtTe 2 instead of Pt 3 Te 4 as the enthalpy of formation of PtTe 2 is the lowest in the Pt–Te system. , …”

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confidence: 99%

“…Note that the direct tellurization of Pt layer will produce PtTe 2 instead of Pt 3 Te 4 as the enthalpy of formation of PtTe 2 is the lowest in the Pt−Te system. 29,30 Single-crystal Pt 3 Te 4 bulk samples could provide a more suitable platform to explore the catalytic activity of mitrofanovite and highlight its peculiarities. Here, we clarify the physicochemical mechanisms ruling the high efficiency in HER of mitrofanovite Pt 3 Te 4 bulk crystals, which displays an overpotential as low as 46 mV at a current density of 10 mA cm −2 and a Tafel slope of 36−49 mV•dec −1 (depending on surface treatments).…”

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confidence: 99%

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Unveiling the Mechanisms Ruling the Efficient Hydrogen Evolution Reaction with Mitrofanovite Pt₃Te₄

Boukhvalov

Jia

D’Olimpio

et al. 2021

J. Phys. Chem. Lett.

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By means of electrocatalytic tests, surface-science techniques and density functional theory, we unveil the physicochemical mechanisms ruling the electrocatalytic activity of recently discovered mitrofanovite (Pt 3 Te 4 ) mineral. Mitrofanovite represents a very promising electrocatalyst candidate for energy-related applications, with a reduction of costs by 47% compared to pure Pt and superior robustness to CO poisoning. We show that Pt 3 Te 4 is a weak topological metal with the invariant, exhibiting electrical conductivity (∼4 × 10 6 S/m) comparable with pure Pt. In hydrogen evolution reaction (HER), the electrode based on bulk Pt 3 Te 4 shows a very small overpotential of 46 mV at 10 mA cm –2 and a Tafel slope of 36–49 mV dec –1 associated with the Volmer–Heyrovsky mechanism. The outstanding ambient stability of Pt 3 Te 4 also provides durability of the electrode and long-term stability of its efficient catalytic performances.

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Thermal- and air- stability of the compositional variants of van der Waals Pt-Telluride thin films probed by high resolution photoemission spectroscopy

Pathirage,

Ravinath Rajapakse,

Lasek

et al. 2024

Applied Surface Science

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Thermodynamic Modeling of the Pt-Te and Pt-Sb-Te Systems

Cited by 6 publications

References 20 publications

Thermal Phase Control of Two-Dimensional Pt-Chalcogenide (Se and Te) Ultrathin Epitaxial Films and Nanocrystals

Thermal Phase Control of Two-Dimensional Pt-Chalcogenide (Se and Te) Ultrathin Epitaxial Films and Nanocrystals

Unveiling the Mechanisms Ruling the Efficient Hydrogen Evolution Reaction with Mitrofanovite Pt₃Te₄

Thermal- and air- stability of the compositional variants of van der Waals Pt-Telluride thin films probed by high resolution photoemission spectroscopy

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Thermodynamic Modeling of the Pt-Te and Pt-Sb-Te Systems

Cited by 6 publications

References 20 publications

Thermal Phase Control of Two-Dimensional Pt-Chalcogenide (Se and Te) Ultrathin Epitaxial Films and Nanocrystals

Thermal Phase Control of Two-Dimensional Pt-Chalcogenide (Se and Te) Ultrathin Epitaxial Films and Nanocrystals

Unveiling the Mechanisms Ruling the Efficient Hydrogen Evolution Reaction with Mitrofanovite Pt3Te4

Thermal- and air- stability of the compositional variants of van der Waals Pt-Telluride thin films probed by high resolution photoemission spectroscopy

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Product

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Unveiling the Mechanisms Ruling the Efficient Hydrogen Evolution Reaction with Mitrofanovite Pt₃Te₄