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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

87
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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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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A highly active and stable hydrogen evolution catalyst based on pyrite-structured cobalt phosphosulfide.

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  • 1Department of Chemistry and Energy Sciences Institute, Yale University, 520 West Campus Drive, West Haven, Connecticut 06511, USA.

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|February 20, 2016
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Researchers developed a new cobalt phosphosulfide catalyst on carbon nanotubes for efficient and durable hydrogen production. This cost-effective material offers a promising alternative to platinum for electrocatalytic applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing cost-effective, active, and durable electrocatalysts is crucial for hydrogen production.
  • Platinum-based catalysts are effective but expensive, driving the need for alternatives.

Purpose of the Study:

  • To design and synthesize a novel hybrid material for efficient electrocatalytic hydrogen evolution.
  • To investigate the structure-property relationships governing the catalyst's performance and stability.

Main Methods:

  • Sequential synthesis of pyrite-structured cobalt phosphosulfide nanoparticles on carbon nanotubes.
  • Electrochemical characterization to evaluate hydrogen evolution reaction (HER) activity.
  • X-ray absorption spectroscopy and computational simulations to understand catalytic mechanisms and stability.

Main Results:

  • The hybrid catalyst achieved high current densities for hydrogen evolution at low overpotentials.
  • Demonstrated superior activity and stability compared to existing non-precious metal catalysts.
  • Phosphorus substitution was identified as key to enhancing chemical stability and catalytic durability.

Conclusions:

  • The developed cobalt phosphosulfide material is a highly active and stable electrocatalyst for hydrogen production.
  • The rational design and synthesis approach offer a viable strategy for creating advanced energy materials.
  • This work contributes to the development of cost-effective alternatives to platinum for clean energy technologies.