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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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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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Updated: Jul 8, 2025

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Rhenium-Based Electrocatalysts for Water Splitting.

Andrés M R Ramírez1,2, Sima Heidari3,4,5, Ana Vergara1

  • 1Centro de Nanotecnología Aplicada, Facultad de Ciencias, Ingeniería y Tecnología, Universidad Mayor, Camino La Pirámide 5750, 8580745 Huechuraba, Santiago RM Chile.

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|December 13, 2023
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Summary
This summary is machine-generated.

Rhenium shows promise as a cost-effective catalyst for hydrogen evolution and oxygen evolution reactions in acidic media, crucial for advancing proton exchange membrane (PEM) electrolyzers and green hydrogen production.

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Area of Science:

  • Electrochemistry and Materials Science
  • Renewable Energy Technologies
  • Catalysis for Sustainable Energy

Background:

  • Growing demand for environmentally friendly energy sources necessitates alternatives to fossil fuels.
  • Hydrogen produced via water electrolysis using renewable energy is a key sustainable energy carrier.
  • Proton exchange membrane (PEM) electrolyzers are promising for commercial hydrogen production but rely on expensive noble metal catalysts (Pt, Ru, Ir).

Purpose of the Study:

  • To review rhenium-based electrocatalysts for water splitting in acidic conditions, focusing on their potential for PEM electrolyzers.
  • To explore rhenium's viability as a cheaper, more abundant alternative to noble metals for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).

Main Methods:

  • Literature review of rhenium-based materials for electrocatalysis in acidic media.
  • Analysis of catalytic mechanisms, evaluation methods, and performance data for HER.
  • Examination of rhenium's application in chemical/photochemical water oxidation and electrocatalysis under basic conditions.

Main Results:

  • Rhenium is identified as a promising candidate for HER in acidic media, aligning with theoretical predictions (e.g., Trasatti volcano plot).
  • Evidence suggests potential for rhenium in OER, although research in acidic electrocatalytic conditions is less extensive.
  • The review consolidates current knowledge on rhenium's performance and stability for water splitting applications.

Conclusions:

  • Rhenium-based materials offer a potential pathway to reduce the cost of PEM electrolyzers by replacing expensive noble metals.
  • Further research is needed to fully understand and optimize rhenium's catalytic activity and long-term stability for OER in acidic environments.
  • Rhenium holds significant promise for advancing green hydrogen production technologies and enabling a mature PEM electrolyzer market.