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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: 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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Efficient homogeneous electrocatalytic hydrogen evolution using a Ni-containing polyoxometalate catalyst.

Debu Jana1, Hema Kumari Kolli1, Subhashree Sabnam1

  • 1School of Chemistry, University of Hyderabad, P.O. Central University, Hyderabad - 500046, India. skdas@uohyd.ac.in.

Chemical Communications (Cambridge, England)
|September 8, 2021
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Summary

Nickel chloride hexahydrate alone lacks electrocatalytic hydrogen evolution reaction (HER) activity. However, when incorporated into a polyoxovanadate matrix, it demonstrates efficient HER catalysis in acidic solutions.

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Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Catalysis

Background:

  • Nickel chloride hexahydrate ([Ni(H2O)6]2Cl2) does not exhibit electrocatalytic hydrogen evolution reaction (HER) activity in aqueous media.
  • The development of efficient and stable electrocatalysts for HER is crucial for sustainable hydrogen production.

Purpose of the Study:

  • To investigate the electrocatalytic HER activity of nickel ions when integrated into a polyoxovanadate framework.
  • To explore the potential of novel polyoxometalate compounds as homogeneous electrocatalysts for hydrogen production.

Main Methods:

  • Electrochemical characterization of the synthesized nickel-containing polyoxovanadate compound (K2[Ni(H2O)6]2[V10O28]·4H2O).
  • Evaluation of catalytic activity through measurements of overpotential and turnover frequency for the hydrogen evolution reaction.

Main Results:

  • The nickel-containing polyoxovanadate compound exhibits homogeneous electrocatalytic HER activity in acidic aqueous solution.
  • Achieved a turnover frequency of 2.1 s⁻¹ and an overpotential of 127 mV at pH 2.3.
  • The catalyst remained stable under electrochemical conditions without decomposition during HER.

Conclusions:

  • The synthesized nickel-containing polyoxometalate is the first of its kind to demonstrate efficient homogeneous electrocatalytic HER.
  • This finding opens new avenues for designing advanced polyoxometalate-based catalysts for clean hydrogen energy production.