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Related Concept Videos

Catalysis02:50

Catalysis

30.9K
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: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

14.5K
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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.1K
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.
3.1K

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Related Experiment Video

Updated: Feb 22, 2026

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

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An efficient Co3S4/CoP hybrid catalyst for electrocatalytic hydrogen evolution.

Tingting Wang1, Liqian Wu1, Xiaobing Xu1,2

  • 1Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing, 210093, China.

Scientific Reports
|September 21, 2017
PubMed
Summary

This study presents a novel, inexpensive cobalt sulfide/phosphide (Co3S4/CoP) hybrid catalyst for efficient hydrogen evolution. This earth-abundant material shows promising performance as a sustainable alternative to platinum for hydrogen production.

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Efficient electrocatalysts are crucial for sustainable energy conversion, particularly for the hydrogen evolution reaction (HER).
  • Cobalt-based sulfides and phosphides mimic the catalytic mechanisms of natural hydrogenases.
  • Developing inexpensive, earth-abundant alternatives to platinum-based catalysts is a key research goal.

Purpose of the Study:

  • To synthesize and characterize a novel Co3S4/CoP hybrid electrocatalyst.
  • To evaluate the hydrogen evolution reaction (HER) performance of the synthesized catalyst in an acidic medium.
  • To explore a new synthetic route for nanocomposite materials.

Main Methods:

  • A two-step synthesis involving hydrothermal preparation of a cobalt precursor followed by simultaneous phosphidation and sulphidation.
  • Characterization of the material's structure, composition, and electrochemical properties.
  • Electrochemical testing for HER activity, including onset overpotential, Tafel slope, and exchange current density.

Main Results:

  • The synthesized Co3S4/CoP hybrid material exhibited a porous core-shell structure with a high electroactive surface area.
  • The catalyst demonstrated excellent HER performance in acid: low onset overpotential (34 mV), small Tafel slope (45 mV dec⁻¹), and high exchange current density (150 μA cm⁻²).
  • The material's homogeneous element distribution and nanostructured morphology contributed to its catalytic activity.

Conclusions:

  • The Co3S4/CoP hybrid nanorod is a highly promising, cost-effective electrocatalyst for HER, offering a viable alternative to platinum.
  • The presented synthetic methodology can be adapted for the creation of other advanced nanocomposite materials.
  • This research advances the development of efficient catalysts for sustainable hydrogen production.