The covalent functionalization of few-layered MoTe2 thin films with iodonium salts

Guselnikova, Olga; Fraser, James P.; Soldatova, Natalia S.; Sviridova, Elizaveta; Ivanov, A. A.; Rodriguez, Raúl D.; Ganin, Alexey Y.; Postnikov, Pavel

doi:10.1016/j.mtchem.2022.100846

Cited by 3 publications

(3 citation statements)

References 56 publications

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“…According to XRD, phase-pure 1T′-MoTe 2 /CC films were formed at 830 °C (Figure a). These reaction conditions are consistent, for example, with those reported for the 1T′-MoTe 2 powder and thin films grown on the SiO 2 /Si-substrate and CC. ,,, Similarly, Raman spectroscopy confirmed the formation of the 1T′-MoTe 2 phase across the CC substrate (Figure b) . The films prepared at lower reaction temperatures gave the diffraction patterns and Raman spectra consistent with mixed 1T′-/2H-MoTe 2 or 2H-MoTe 2 films (Figures S6 and S7).…”

Section: Resultssupporting

confidence: 84%

Assessing Challenges of 2D-Molybdenum Ditelluride for Efficient Hydrogen Generation in a Full-Scale Proton Exchange Membrane (PEM) Water Electrolyzer

Kumar Samuel,

Faqeeh,

et al. 2024

ACS Sustainable Chem. Eng.

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Proton exchange membrane (PEM) water electrolyzers are critical enablers for sustainable green hydrogen production due to their high efficiency. However, nonplatinum catalysts are rarely evaluated under actual electrolyzer operating conditions, limiting knowledge of their feasibility for H2 production at scale. In this work, metallic 1T′-MoTe2 films were synthesized on carbon cloth supports via chemical vapor deposition and tested as cathodes in PEM electrolysis. Initial three-electrode tests revealed that at 100 mA cm–2, the overpotential of 1T′-MoTe2 approached that of leading 1T′-MoS2 systems, confirming its promise as a hydrogen evolution catalyst. However, when tested in a full-scale PEM electrolyzer, 1T′-MoTe2 delivered only 150 mA cm–2 at 2 V, far below expectations. Postelectrolysis analysis revealed an unexpected passivating tellurium layer, likely inhibiting catalytic sites. While initially promising, the unanticipated passivation caused 1T′-MoTe2 to underperform in practice. This highlights the critical need to evaluate emerging electrolyzer catalysts in PEM electrolyzers, revealing limitations of the idealized three-electrode configuration. Moving forward, validation of model systems in actual electrolyzers will be key to identifying robust nonplatinum catalysts for sustainable green hydrogen production.

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Section: Resultssupporting

confidence: 84%

Assessing Challenges of 2D-Molybdenum Ditelluride for Efficient Hydrogen Generation in a Full-Scale Proton Exchange Membrane (PEM) Water Electrolyzer

Kumar Samuel,

Faqeeh,

et al. 2024

ACS Sustainable Chem. Eng.

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“…Further optimization revealed that the change from Et3N to inorganic bases also not beneficial (entries 12, 13). The addition of pyridine or its derivatives resulted in a drastically reduced yield (up to 11%; Table 1, entries [12][13][14][15][16][17]. We also varied the type of copper catalysts and found that both the change of the counter anion and the oxidation state led to a lower yield of 3a (entries 18-21).…”

Section: Resultsmentioning

confidence: 99%

“…1,2 Over the past five years, the chemistry of iodonium salts has found a number of entirely new applications as organocatalysts, [3][4][5] tectones in crystal growth, [6][7][8][9][10][11] agents for polymerizations, [12][13][14] or even in surface modifications. [15][16][17][18][19][20] However, the main application of diaryliodonium salts is still related to their ability to arylate a variety of nucleophiles (C, N, P, S, halogens, etc.). 1,2,[21][22][23] The use of diaryliodonium salts in the arylation of N-containing heterocyclic systems is particularly attractive especially because of their ubiquitous application in drug development.…”

Section: Introductionmentioning

confidence: 99%

Ligand-Free Ullmann-Type Arylation of Oxazolidinones by Diaryliodonium Salts

Podrezova

Okhina

Rogachev

et al. 2022

Preprint

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The arylation of azaheterocycles can be considered as one of the most important processes for the preparation of various biologically active compounds. In the present work, we describe a method for the copper-catalyzed N-arylation of hindered oxazolidinones using diaryliodonium salts. The method succeeds in good to excellent yields for the arylation of 4-alkyloxazolidinones, including sterically hindered isopropyl- and tert-butyl-substituted representatives. The efficiency of the method was demonstrated for a wide range of diaryliodonium salts - symmetric and unsymmetric as well as ortho-substituted. The developed approach can provide an important contribution in the development and preparation of novel drugs and bioactive molecules containing oxazolidinone moieties.

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Iodonium Salts as Reagents for Surface Modification: From Preparation to Reactivity in Surface-Assisted Transformations

Guselnikova

Soldatova

Postnikov

2022

Aryl Diazonium Salts and Related Compounds

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The covalent functionalization of few-layered MoTe2 thin films with iodonium salts

Cited by 3 publications

References 56 publications

Assessing Challenges of 2D-Molybdenum Ditelluride for Efficient Hydrogen Generation in a Full-Scale Proton Exchange Membrane (PEM) Water Electrolyzer

Assessing Challenges of 2D-Molybdenum Ditelluride for Efficient Hydrogen Generation in a Full-Scale Proton Exchange Membrane (PEM) Water Electrolyzer

Ligand-Free Ullmann-Type Arylation of Oxazolidinones by Diaryliodonium Salts

Iodonium Salts as Reagents for Surface Modification: From Preparation to Reactivity in Surface-Assisted Transformations

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