AI Insight
Researchers at Ulm University have determined that the catalytically active surface of nickel electrodes used in alkaline water electrolysis consists of nickel dioxide (NiO₂), not nickel oxyhydroxide (NiOOH) as previously assumed for decades. This discovery corrects a fundamental misunderstanding about how nickel catalysts function under actual reaction conditions during hydrogen production. The findings were published in Nature Catalysis and represent a significant advancement in understanding this important catalytic system.
Why it matters
This discovery could enable the optimization of nickel-based catalysts for more efficient and cost-effective hydrogen production through water electrolysis, which is essential for developing climate-neutral energy systems. Understanding the true active surface structure allows researchers to design better catalysts for green hydrogen production, a critical technology for reducing carbon emissions.
Understand the Science
Nickel is a promising, cost-effective and robust catalyst for alkaline water electrolysis—a key technology for the climate-neutral production of hydrogen. However, the actual structure of the active surface of such nickel electrodes under reaction conditions had not yet been conclusively determined. A research team at Ulm University has now refuted a decades-old assumption: The catalytically active surface does not consist of nickel oxyhydroxide (NiOOH), as was previously widely assumed, but is nickel dioxide (NiO₂). The findings have been published in the journal Nature Catalysis.
Source: Chemists uncover the true active surface of nickel catalysts