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H2U Achieves Unprecedented Performance and Durability with Non-Iridium Catalysts

Non-Iridium Materials Tackle Supply Chain Hurdles for Sustainable Hydrogen Production

Electrochemical Test Engineer, evaluates low-cost iridium alternatives on one of the 20-plus catalyst test stations at H2U’s Chatsworth, California facility
Dr. Zachary Ifkovits, Electrochemical Test Engineer, evaluates low-cost iridium alternatives on one of the 20-plus catalyst test stations at H2U’s facility in Chatsworth, Calif.

CHATSWORTH, Calif. – September 19, 2023 – H2U Technologies, a next-generation electrolyzer developer, has performed durability tests on new, lower-cost, iridium-free catalyst materials that demonstrate a projected lifetime of 25,000 hours. This groundbreaking durability milestone represents a significant breakthrough and addresses supply chain bottlenecks for sustainable hydrogen production with Proton Exchange Membrane (PEM) electrolyzers.

Discovering non-iridium catalysts for commercial applications has been challenging, as novel materials often degrade rapidly under the harsh acidic conditions of the oxygen evolution reaction (OER). For perspective, the best iridium-free catalysts known to date offer lifetimes of approximately 1,000 to 1,400 hours. With a baselineof over 4,000 hours of continuous operation thus far, H2U's iridium-free catalysts, tested at 10x higher current density, are demonstrating projected lifetimes of over 25,000 hours. H2U catalysts are projected to last at least six years for targeted applications, such as in PEM electrolyzers paired with curtailed renewables.

Why catalyst durability is important

As the hydrogen economy grows and the demand for hydrogen increases, maintaining catalyst performance without relying on iridium becomes even more critical. Durable catalysts enable the scalability of hydrogen production and utilization technologies by reducing the frequency of replacements and associated costs.

The reliance on iridium has raised industry concerns, as the U.S. Department of Energy has recently categorized iridium as the sole material in the hydrogen sector at high risk of supply disruptions.

H2U's innovative catalysts are cost-effective and more readily available than iridium. Utilizing these affordable alternatives expands the possibilities for electrolyzer stack design, enabling H2U to explore avenues unrestricted by ultra-thin catalyst layers and low usage of catalysts. This flexibility significantly reduces capital expenses, producing more affordable delivered hydrogen.

"Our talented scientists and engineers have achieved an exceptional breakthrough with rigorous testing of various families of alternative lower-cost compounds. The discovery of relatively earth-abundant materials using our Catalyst Discovery Engine™ (CDE™) has demonstrated a projected lifetime of 25,000 hours in ongoing tests, a milestone previously considered unattainable without iridium," said Mark McGough, H2U's President and CEO. "As these successful trials continue, we expect to attain further breakthroughs."

H2U's Senior Catalyst Engineer, Dr. Michael Mazza, remarked, "This achievement of a 25,000-hour lifetime is the best durability number we've seen for an iridium-free catalyst in a PEM electrolyzer. Our CDE team found promising catalysts and developed a unique process to integrate the materials into membrane electrode assemblies to optimize activity and durability. This discovery not only represents a technological leap but also contributes significantly to addressing the global need for sustainable hydrogen production. We are excited about the potential impact of our team's ongoing scientific discoveries on the clean energy landscape."

H2U's discovery and testing of durable non-iridium catalysts has the potential to lower the upfront costs of electrolyzers significantly. This becomes especially important in the coming years, as the limited availability of iridium will result in shortages and significant price hikes, posing a major obstacle to a swift transition to cleaner energy.

For more information about H2U's pioneering work in discovering long-lasting, low-cost catalyst materials for hydrogen production, visit H2U can also be found on LinkedIn and X/Twitter.

About H2U Technologies, Inc.

H2U Technologies is a California-based developer of low-capital-cost, iridium-free proton exchange membrane (PEM) electrolyzers that are particularly suited for pairing with renewable energy sources. The company leverages its Catalyst Discovery Engine™ (CDE™) capabilities to develop novel catalysts for use in its electrolyzer systems. The world-class technology featured in H2U Technologies' products stems from ten years of research and development at Caltech, funded by the U.S. Department of Energy. For more information, visit

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Agency Contact:

PJ Jennings

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