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Manganese and iridium catalyst marks significant advance in sustainable hydrogen production
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Manganese and iridium catalyst marks significant advance in sustainable hydrogen production
by Riko Seibo
Tokyo, Japan (SPX) May 10, 2024

The quest for a sustainable, large-scale production of green hydrogen may soon reach a critical milestone, thanks to a new method developed by researchers at RIKEN. The study, led by Ryuhei Nakamura and published in Science on May 10, details a technique that significantly reduces the iridium required in electrolyzers, potentially transforming the hydrogen production industry.

Hydrogen, abundant and renewable, is seen as a key player in the transition away from fossil fuels. Yet, extracting it from water on a commercial scale has been hampered by the need for rare metals like iridium. "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.

RIKEN's approach cleverly combines manganese oxide with atomically dispersed iridium atoms, maintaining hydrogen production rates while using 95% less iridium. This innovation allows for continuous hydrogen generation for over 3000 hours with 82% efficiency, offering a viable path towards sustainable energy solutions.

"The unexpected interaction between manganese oxide and iridium was key to our success," says co-author Ailong Li. Nakamura added, "We expect our catalyst to be easily transferred to real-world applications."

As the team works with industry partners to refine and test this catalyst further, their research holds the promise of bridging the gap between today's limited green hydrogen production methods and a future where such methods are broadly viable.

Research Report:Atomically dispersed hexavalent iridium oxide from MnO2 reduction for oxygen evolution catalysis

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