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Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

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Atomically Dispersed Iridium on Polyimide Support for Acidic Oxygen Evolution.

Longsheng Zhang¹, Jing Bai¹, Shouhan Zhang¹

¹Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.

|August 8, 2024

Summary

This summary is machine-generated.

We developed a stable iridium single-atom catalyst for acidic water electrolysis. Immobilizing iridium on a polyimide support significantly boosts oxygen evolution reaction activity and durability.

Keywords:

iridium metal−support interactions oxygen evolution reaction polyimide single-atom catalysts

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Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

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Published on: November 7, 2016

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Acidic water electrolysis is crucial for sustainable hydrogen production.
Iridium (Ir) catalysts show high activity for the oxygen evolution reaction (OER) but require efficient metal usage.
Stabilizing single Ir atoms under OER conditions is challenging.

Purpose of the Study:

To design and synthesize a highly active and stable iridium single-atom catalyst for acidic OER.
To investigate the role of a polyimide support in stabilizing single Ir atoms and enhancing catalytic performance.

Main Methods:

Immobilization of Ir single atoms onto a polyimide support.
Electrochemical characterization of the catalyst for OER performance.
Density functional theory (DFT) calculations to understand reaction mechanisms.

Main Results:

The Ir single-atom catalyst on polyimide support (Ir ₁-PI@CP) exhibited high mass activity for OER.
The catalyst demonstrated excellent stability, with negligible decay over 360 hours.
A 49.7-fold improvement in mass activity was observed compared to a catalyst without polyimide support.

Conclusions:

The polyimide support enhances Ir 5d states, tailoring intermediate adsorption and lowering OER thermodynamic barriers.
Strong metal-support interactions facilitate proton-electron transfer, improving reaction kinetics.
This work presents a viable strategy for developing robust single-atom catalysts for various applications.