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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 Hydrogenation

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Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells

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Published on: October 20, 2023

Directing oxygen reduction reaction selectivity towards hydrogen peroxide via electric double layer engineering.

Jingyi Chen¹, Yilin Zhao¹, Haozhou Yang¹

¹Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore. wanglei8@nus.edu.sg.

|February 2, 2023

Summary

This study enhances hydrogen peroxide (H₂O₂) production using electrocatalysis by engineering the electric double layer. Introducing a cationic surfactant significantly boosts H₂O₂ selectivity and activity in the oxygen reduction reaction (ORR).

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Hydrogen Production and Utilization in a Membrane Reactor

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

Area of Science:

Electrochemistry
Materials Science
Sustainable Chemistry

Background:

The electrochemical oxygen reduction reaction (ORR) is a key process for sustainable H₂O₂ production.
Improving selectivity towards the desired 2-electron pathway is crucial for efficient H₂O₂ synthesis.

Purpose of the Study:

To develop a facile strategy for enhancing ORR selectivity and activity towards H₂O₂ production.
To investigate the role of electric double layer engineering in promoting the 2e^- ORR.

Main Methods:

Utilizing immobilized cobalt phthalocyanine as an electrocatalyst.
Employing electric double layer engineering with a cationic surfactant (CTAB).
Conducting kinetic analysis to understand reaction mechanisms.

Main Results:

Achieved over 93% selectivity for H₂O₂ production, a significant increase from below 60%.
Enhanced the intrinsic activity for H₂O₂ formation by more than 3 times.
Demonstrated the effectiveness of CTAB in modifying the electrode/electrolyte interface.

Conclusions:

Electric double layer engineering via cationic surfactants is an effective strategy to boost 2e^- ORR performance.
Enhanced electric field strength at the interface and reduced charge transfer resistance contribute to improved H₂O₂ formation.
This approach offers a promising pathway for sustainable and efficient H₂O₂ synthesis.