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Related Concept Videos

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
Benzene to Phenol via Cumene: Hock Process01:27

Benzene to Phenol via Cumene: Hock Process

The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene hydroperoxide...
Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems01:15

Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems

Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen.
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...

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Solution-Processable Microstructuring of 1T'-Phase Janus MoSSe Monolayers for Boosted Hydrogen Production.

Zhengqing Liu1, Zhehao Sun2, Xiaoyan Qu3

  • 1Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Xi'an Institute of Biomedical Materials and Engineering, Northwestern Polytechnical University, Xi'an 710129, China.

Journal of the American Chemical Society
|August 9, 2024
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Researchers developed a scalable method for Janus 1T'-molybdenum diselenide (MoSe2) monolayers. This new catalyst shows enhanced hydrogen evolution reaction (HER) activity, boosted by light-induced effects for clean energy applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Janus monolayers of transition metal dichalcogenides (TMDs) possess tunable properties for diverse applications.
  • Scalable synthesis of unconventional 1T"-phase Janus TMDs is a significant challenge.
  • Previous research primarily focused on the conventional 2H-phase Janus TMDs.

Purpose of the Study:

  • To develop a scalable synthesis strategy for Janus 1T"-phase molybdenum diselenide (MoSSe) and related materials.
  • To investigate the electrocatalytic hydrogen evolution reaction (HER) activity of these novel Janus TMDs.
  • To explore the synergistic effects of intrinsic strain, electronic structure, and plasmonic enhancement on catalytic performance.

Main Methods:

  • Fabrication of Janus 1T"-MoOSe and MoSSe monolayers via a solution strategy, growing Se-Mo-O/S shells onto gold (Au) nanocores.
  • Electrocatalytic testing of the Janus Au@1T"-MoSSe catalyst for the hydrogen evolution reaction (HER).
  • Investigation of localized surface plasmon (LSP) effects by photoexciting the Au nanocores to enhance HER activity.

Main Results:

  • The Janus Au@1T"-MoSSe catalyst demonstrated superior HER activity compared to 1T"-MoS2, -MoSe2, and -MoOSe.
  • Enhanced catalytic activity was attributed to the unique electronic structure and intrinsic strain of the Janus 1T"-MoSSe.
  • Photoexcitation of Au cores significantly boosted HER via hot electron injection into sulfur vacancies, driven by localized surface plasmons (LSPs).

Conclusions:

  • A scalable synthesis for polymorphic Janus TMDs in the 1T"-phase was achieved.
  • Synergistic activation of anion vacancies by strain and light-induced LSPs offers a pathway for advanced catalysis.
  • Tailorable Janus TMDs present opportunities for developing efficient catalysts for applications like hydrogen production.