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

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Atomically dispersed hexavalent iridium oxide from MnO₂ reduction for oxygen evolution catalysis.

Ailong Li¹, Shuang Kong¹, Kiyohiro Adachi²

¹Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science (CSRS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

Science (New York, N.Y.)

|May 9, 2024

Summary

Atomically dispersed hexavalent iridium (Ir^VI) oxide was synthesized for proton exchange membrane water electrolysis. This novel Ir^VI-adsorbed material exhibits superior activity and stability, outperforming benchmark iridium oxides.

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Area of Science:

Electrochemistry
Materials Science
Catalysis

Background:

Iridium oxides are crucial for oxygen evolution reaction (OER) in acidic media.
Hexavalent iridium (Ir^VI) oxide shows theoretical promise for enhanced OER activity and stability.
Experimental synthesis of Ir^VI oxide remains a significant challenge.

Purpose of the Study:

To synthesize and characterize atomically dispersed Ir^VI oxide (Ir^VI-ado).
To evaluate the performance of Ir^VI-ado as an anode material in proton exchange membrane (PEM) water electrolysis.
To investigate the stability and durability of Ir^VI-ado under operational conditions.

Main Methods:

Synthesis of Ir^VI-ado via oxidative ligand substitution of potassium hexachloroiridate(IV) with manganese oxide.
Characterization using advanced spectroscopic and microscopic techniques.
Electrochemical testing in a PEM water electrolyzer setup with in situ X-ray analysis.

Main Results:

Achieved a mass-specific activity of 1.7 × 10⁵ A/g Ir, significantly higher than benchmark iridium oxides.
Demonstrated a high turnover number of 1.5 × 10⁸.
Confirmed the durability of Ir^VI-ado at current densities up to 2.3 A/cm² via in situ X-ray analysis during PEM operation.

Conclusions:

Atomically dispersed Ir^VI oxide (Ir^VI-ado) has been successfully synthesized and characterized.
Ir^VI-ado exhibits exceptional activity and stability for the oxygen evolution reaction in PEM water electrolysis.
This material holds significant promise as a next-generation anode for efficient and durable water splitting.