Green Energy Breakthrough: Catalyst Slashes Iridium Use by 95% in Hydrogen Electrolyzers

Researchers have developed a new method that reduces the iridium required to produce “green” hydrogen by 95%, maintaining production rates and promising to enhance the feasibility of a carbon-neutral hydrogen economy. Credit: SciTechDaily.com

As the world is transitioning from a fossil fuel-based energy economy, many are betting on hydrogen to become the dominant energy currency. But producing “green” hydrogen without using fossil fuels is not yet possible on the scale we need because it requires iridium, a metal that is extremely rare.

The green way to extract hydrogen from water is an electrochemical reaction that requires a catalyst. The best catalysts for this reaction—the ones that yield the highest rate and the most stable hydrogen production—are rare metals, with iridium being the best of the best. But the scarcity of iridium is a big problem. “Iridium is so rare that that scaling up global hydrogen production to the terawatt scale is estimated to require 40 years’ worth of iridium,” says co-first author Shuang Kong.

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