High-Density Single-Atom Iridium Catalysts Unlock Durable Green Hydrogen Production

Published on Quantum Server Networks • September 2025

Green hydrogen iridium catalyst

In the ever-pressing battle against climate change, the search for clean, scalable energy solutions has propelled hydrogen to the forefront. But despite its promise, producing green hydrogen—hydrogen created via renewable-powered water electrolysis—still faces major hurdles, particularly in catalyst durability and efficiency. Now, researchers have unveiled a breakthrough catalyst design that could reshape the green hydrogen landscape by stabilizing single-atom iridium on a nanosheet framework.

🔬 The Catalyst Challenge

Water electrolysis, the process of splitting water into hydrogen and oxygen using electricity, lies at the heart of green hydrogen production. Central to this process is the oxygen evolution reaction (OER), which typically requires high energy input and suffers from sluggish kinetics. Traditional OER catalysts based on iridium oxide (IrO₂) are effective but costly and prone to degradation over time, especially under industrial-scale operations.

To tackle these issues, a multinational research team led by Professor Johnny Ho of the City University of Hong Kong has developed a new class of catalysts dubbed CoCe–O–IrSA. This design utilizes atomically dispersed iridium on cobalt-cerium oxide nanosheets, drastically improving activity and long-term durability in water-splitting reactions.

⚛️ Single Atoms, Big Impact

The key lies in stabilizing high-density single atoms of iridium—a notoriously difficult task due to the natural tendency of atoms to clump together during catalysis. The team overcame this challenge using a method that induces the self-reconstruction of metastable precursor phases into a more ordered and stable framework. This effectively locks each iridium atom into place, maximizing both the number and effectiveness of active sites.

The result: a catalyst that requires only 187 mV overpotential at 100 mA/cm² and maintains performance for over 1,000 hours in alkaline environments. Even when used in natural seawater electrolysis setups, the catalyst remained efficient and stable for more than 150 hours—showing immense promise for real-world applications.

🌊 Toward Real-World Green Hydrogen

Unlike many lab-scale innovations, this catalyst has already been tested under conditions mimicking practical deployment, including seawater electrolysis and fluctuating power supply scenarios. The material's performance under stress highlights its potential as a core component in next-generation electrolyzers.

Moreover, the team's approach could be extended to earth-abundant and non-noble metals, reducing dependence on iridium and paving the way for scalable, cost-effective catalyst development.

🌍 A Catalyst for Change

Professor Ho emphasized the broad implications: “Our work contributes to making large-scale green hydrogen production more practical, cost-effective, and durable, paving the way for cleaner transportation, energy storage, and industrial processes.”

This research brings us one step closer to an energy future where hydrogen, harvested sustainably even from seawater, powers everything from fuel cell vehicles to steelmaking facilities—all with zero carbon emissions.

📖 Learn More

🧪 Original publication in Nature Communications: https://doi.org/10.1038/s41467-025-58163-0

📰 Article summary on Phys.org: https://phys.org/news/2025-09-catalyst-green-hydrogen-production-efficient.html

🔍 Tags: #hydrogen, #catalyst, #renewableenergy, #oxygen

This article was prepared with the assistance of AI technologies and reviewed by a human editor prior to publication.

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