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Related Concept Videos

Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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.
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...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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...
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Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
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Two-Dimensional GeTe: Air Stability and Photocatalytic Performance for Hydrogen Evolution.

Xin Zhang1, Fulai Zhao1, Yu Wang1

  • 1Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, P. R. China.

ACS Applied Materials & Interfaces
|July 10, 2020
PubMed
Summary
This summary is machine-generated.

Two-dimensional Germanium Telluride (2D GeTe) nanosheets were synthesized for photocatalytic water splitting. Optimized Ar-GeTe achieved a hydrogen evolution rate of 1.13 mmol g⁻¹ h⁻¹, demonstrating potential for solar energy conversion.

Keywords:
air stabilitygermanium tellurideoxide structurephotocatalyticvalence band

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Photocatalytic water decomposition is crucial for converting solar energy into chemical energy.
  • Two-dimensional (2D) materials, like graphene, have significantly advanced photocatalysis research.
  • Exploring novel 2D materials for efficient solar fuel production remains an active area.

Purpose of the Study:

  • To investigate the photocatalytic hydrogen production potential of 2D Germanium Telluride (GeTe) nanosheets for the first time.
  • To compare the performance of GeTe exfoliated in argon (Ar-GeTe) versus air (O-GeTe).
  • To understand the effect of oxidation on the electronic structure and photocatalytic activity of 2D GeTe.

Main Methods:

  • Ultrasonic-assisted liquid-phase exfoliation was used to prepare 2-4 layer GeTe nanosheets.
  • Photocatalytic hydrogen evolution rates were measured under mild conditions.
  • Density Functional Theory (DFT) computations were employed to analyze structural stability and electronic properties.

Main Results:

  • Both Ar-GeTe and O-GeTe exhibited indirect band gaps, with oxidation increasing the band gap energy.
  • All GeTe samples possessed suitable band positions for driving photocatalytic water splitting.
  • Maximum hydrogen evolution rates were 1.13 mmol g⁻¹ h⁻¹ for Ar-GeTe and 0.54 mmol g⁻¹ h⁻¹ for O-GeTe.

Conclusions:

  • 2D GeTe is a promising material for photocatalytic water splitting, with performance influenced by oxidation.
  • The structural stability of GeTe in air is enhanced by oxygen incorporation, affecting its photocatalytic activity.
  • The material's light requirement and oxygen deficiency suggest advantages for space-based energy supply applications.