Dissociation of molybdenum and tungsten selenides

Viksman, G. Sh.; Gordienko, S. P.; Yanaki, A.A.; Klochkov, L. A.

doi:10.1007/bf00843024

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…O'Hare and Tasker in [6] did a fluorine-combustion calorimetric study to determine its standard enthalpy of formation. Their molar ΔfH ○ result of -234.2 ± 3.3 kJ⋅mol -1 at 298.15 K is in a formal agreement with the previous estimate by Mills [7] of -197 ± 42 kJ⋅mol -1 and the value of -272.0 ± 35.0 obtained by Viksman et al from the dissociation study [8], but the last two have too wide a range of uncertainty. Kiwia and Westrum in [9] measured the low-temperature heat capacity by adiabatic calorimetry, and Blinder et al published data in a broad temperature range from adiabatic and drop calorimetry in [10].…”

Section: Introductionsupporting

confidence: 91%

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Thermodynamic properties of 2H-MoSe2 from first principles quasi-harmonic approximation

Vasiliev

2020

Phys. Chem. Solid St.

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In this paper, we report the results of first-principles calculation of 2H-MoSe2 thermodynamic properties within the quasi-harmonic approximation. The focus of the article is on the temperature dependencies of the heat capacity up to 1000 ℃ and values of enthalpy of formation, enthalpy, and entropy at 298,15 K, and their comparative analysis with the existing experimental data. The results show good general agreement with the published experimental data sets allowing to use them as arbitration of existing discrepancies. Increasing deviations of the heat capacity above the room temperature suggest that factors not included in the quasi-harmonic approximation, such as vibrational anharmonicity, may have a significant influence on the thermodynamics of 2H-MoSe2 in this temperature region. Considering the inconclusive high-temperature data from the experiment, the present results may be recommended as a satisfactory approximation until the appearance of more reliable experimental data or calculation results, taking into account more finite-temperature effects.

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Section: Introductionsupporting

confidence: 91%

“…Kiwia and Westrum in [9] measured the low-temperature heat capacity by adiabatic calorimetry, and Blinder et al published data in a broad temperature range from adiabatic and drop calorimetry in [10]. The indirect results from the dissociation study on the hightemperature thermodynamic properties are also given in [8].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of 2H-MoSe2 from first principles quasi-harmonic approximation

Vasiliev

2020

Phys. Chem. Solid St.

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“…The second suggested scenario considers the substitution via interdiffusion of W in the primarily-grown-WSe 2 nanosheet by Mo during the second step. The lower Gibbs free energy for the MoSe 2 formation compared to WSe 2 under the selected growth temperature (<700 °C) [ 25 ] suggests that MoSe 2 tends to reduce its surface energy relatively to WSe 2 . Thus, Mo diffused towards the nanosheet core upon shell growth on the preexisting WSe 2 nanosheet surfaces.…”

Section: Resultsmentioning

confidence: 99%

Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth

Hwang

Shin

2021

Materials

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The ability to control the active edge sites of transition metal dichalcogenides (TMDs) is crucial for modulating their chemical activity for various electrochemical applications, including hydrogen evolution reactions. In this study, we demonstrate a colloidal synthetic method to prepare core-shell-like heterostructures composed of MoSe2 and WSe2 via a two-step sequential growth. By overgrowing WSe2 on the surface of preexisting MoSe2 nanosheet edges, MoSe2-core/WSe2-shell heterostructures were successfully obtained. Systematic comparisons of the secondary growth time and sequential order of growth suggest that the low synthetic temperature conditions allow the stable overgrowth of shells rich in WSe2 on top of the core of MoSe2 with low Gibbs formation energy. The electrochemical analysis confirms that the catalytic activity correlates to the core-shell composition variation. Our results propose a new strategy to control the edge site activity of TMD materials prepared by colloidal synthesis, which is applicable to diverse electrochemical applications.

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Dissociation of molybdenum and tungsten selenides

Cited by 2 publications

References 2 publications

Thermodynamic properties of 2H-MoSe2 from first principles quasi-harmonic approximation

Thermodynamic properties of 2H-MoSe2 from first principles quasi-harmonic approximation

Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth

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