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Related Experiment Video

Updated: Jun 30, 2025

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

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Published on: December 4, 2017

Electron Spin Selective Iridium Electrocatalysts for the Oxygen Evolution Reaction.

Carlos J Mingoes¹, Bob C Schroeder², Ana B Jorge Sobrido¹

¹School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.

ACS Materials Au

|March 18, 2024

Summary

Chiral molecule functionalization significantly boosts iridium nanoparticle electrocatalyst activity for oxygen evolution reaction (OER) in water electrolysis. This enhances sustainable energy technologies by improving efficiency and reducing byproducts.

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Published on: April 10, 2018

Area of Science:

Materials Science
Electrochemistry
Sustainable Energy

Background:

Efficient electrocatalysts are vital for water electrolysis and a sustainable energy future.
Iridium-based materials are well-known electrocatalysts, but their activity requires enhancement for commercial viability.

Purpose of the Study:

To investigate a novel method for enhancing the electrocatalytic activity of iridium nanoparticles for the oxygen evolution reaction (OER).
To explore the impact of chiral molecule functionalization on iridium nanoparticle performance in water electrolysis.

Main Methods:

Synthesis of iridium nanoparticles (2.1 ± 0.2 nm) functionalized with chiral molecules.
Comparative electrochemical testing of chiral-functionalized, achiral-functionalized, and unfunctionalized iridium nanoparticles.
Measurement of OER activity at a potential of 1.55 V vs. Reference Hydrogen Electrode (RHE).
Colorimetric analysis to detect hydrogen peroxide production.

Main Results:

Chiral-functionalized iridium nanoparticles demonstrated a significant enhancement in OER activity (average 85% increase) compared to unfunctionalized nanoparticles.
Achiral-functionalized nanoparticles showed a modest activity enhancement (average 13%).
The enhanced activity is attributed to a spin-selective electron transfer mechanism induced by the ligand's chirality.
Chiral functionalization drastically reduced hydrogen peroxide production.

Conclusions:

Chiral molecule functionalization is a highly effective strategy for boosting the OER activity of iridium electrocatalysts.
The observed enhancement is linked to chirality-induced spin-selective electron transfer.
This approach offers a promising pathway for developing advanced electrocatalysts for efficient and sustainable water electrolysis.