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Reduction of Alkenes: Catalytic Hydrogenation02:13

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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.
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Janus Mo2P3 Monolayer as an Electrocatalyst for Hydrogen Evolution.

Huan Lou1,2, Kaiwen Qiu1, Guochun Yang1,2

  • 1Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China.

ACS Applied Materials & Interfaces
|November 29, 2021
PubMed
Summary

Researchers discovered a new 2D material, Mo2P3 monolayer, for efficient and low-cost electrocatalytic water splitting. This material exhibits high stability and catalytic activity comparable to platinum for hydrogen production.

Keywords:
DFTelectrocatalysishydrogen evolution mechanismmolybdenum phosphidestrain

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Large-scale hydrogen production via water splitting requires efficient, low-cost electrocatalysts.
  • Two-dimensional (2D) materials are promising due to their high surface area and electronic properties.

Purpose of the Study:

  • To identify novel 2D materials for electrocatalytic water splitting.
  • To investigate the catalytic performance and stability of a newly discovered Mo2P3 monolayer.

Main Methods:

  • First-principle structure search calculations were employed to discover the Mo2P3 monolayer.
  • Density Functional Theory (DFT) was used to analyze its electronic structure, catalytic activity, and stability.

Main Results:

  • A novel Janus Mo2P3 monolayer with out-of-plane asymmetry was identified.
  • The material exhibits inherent metallicity, ensuring good electrical conductivity.
  • Its catalytic activity is comparable to platinum, with a high density of active sites (2.65 × 10^15 site/cm^2).
  • Mo → P charge transfer enhances phosphorus atom activity, and the asymmetric structure exposes more active sites.
  • Hydrogen production occurs spontaneously via the Volmer-Heyrovsky pathway.
  • The material demonstrates excellent stability under strain due to covalent and ionic bonding.

Conclusions:

  • The Mo2P3 monolayer is a highly stable and efficient electrocatalyst for water splitting.
  • Its unique Janus structure and electronic properties make it a promising candidate for low-cost hydrogen production.