Hydrogen production could get more efficient thanks to a new material combination found at the University of Groningen. Researchers there say careful coordination of materials in a protonic ceramic electrolyser cell (PCEC) can double hydrogen production for the same amount of electricity. According to a university release dated 22 October 2026, the results were published in Energy & Environmental Science on 14 October 2026. This article is based on that release and the published paper.
Why hydrogen production needs new methods
Many chemical processes need hydrogen, and much of it is still made from fossil fuels. Splitting water with electricity is a cleaner route, but it takes energy. A PCEC is a device that produces hydrogen from water at temperatures that match key industrial processes, and because it works with steam, the university says the entire process, including the required heating, takes less energy.
How a PCEC splits steam for hydrogen production
Instead of liquid water, a PCEC works with steam. The steam is split into oxygen and protons, which are hydrogen atoms without an electron. In the middle of the cell sits a ceramic membrane. Only the protons are small enough to pass through its pores, drawn by a negative charge on the other side, where they form hydrogen gas again.
Because the other atoms cannot pass through, the hydrogen that is produced stays separate from everything else.
The material synergy behind the result
The main challenge is splitting the steam using as little energy as possible. Vassilis Kyriakou and his team developed a new nanoengineered material for the steam side of the membrane that encourages this splitting when paired with the right membrane materials.
“We discovered a previously overlooked synergy between membrane and electrode materials,” Kyriakou says. With the right combination, the researchers doubled hydrogen production compared with previous PCECs and showed stable operation for at least 500 hours.
The paper’s title gives more detail: “Cross-Interface Diffusion-Driven Exsolution of Praseodymium Oxide Nanoparticles for Enabling Electrolysis at Industrially Relevant Temperatures in Protonic Ceramic Cells”. In plain terms, according to the abstract, tiny praseodymium oxide nanoparticles form on the steam-side electrode as ions diffuse across the boundary between materials during manufacturing. The paper’s abstract also reports faradaic efficiency above 95%, a measure of how much of the electric current goes into making hydrogen, and operation between 400 and 650 °C. Faradaic efficiency is not the same as overall energy efficiency.
A research path that changed direction
Kyriakou says the discovery was not the original plan. “Our research initially had a different direction, but our first findings made us think of a completely new research direction. This created the feeling of falling down a rabbit hole, but it turns out there was a wonderland waiting for us on the other side.”
The paper’s first author is Nannan Li. For more on new energy materials, see our earlier story on a zinc battery electrolyte that lasts 7,000 hours.
What the release does not say
The university release does not give a cost estimate, a cell size, a production rate in absolute terms or a timeline for commercial use. The doubling is measured against previous PCECs, not against other electrolyser types now on the market. Stable operation for 500 hours is promising for a lab cell, but industrial equipment needs to run for far longer.
The case for and against
The case for this work is that it improves output without using more electricity, which goes to the heart of the cost problem for green hydrogen. Working at industrially relevant temperatures could also make it easier to pair with factories that already produce heat.
The case for caution is that this is a lab result. Long-term durability, scaling and cost are still unknown, and the release itself is short on detail.
My view on hydrogen production
As a writer, I feel the honest “rabbit hole” story is my favourite part, because it shows how much science depends on following unexpected results. Doubling output at the same power use is a meaningful headline for green hydrogen. I would treat it as an early step and wait for longer tests and larger cells.
FAQ: Groningen hydrogen production study
What did the Groningen team achieve?
They doubled hydrogen production for the same electricity use compared with previous protonic ceramic electrolyser cells, with stable operation for at least 500 hours.
What is a protonic ceramic electrolyser cell?
It is a device that splits steam and lets only protons pass through a ceramic membrane, keeping the hydrogen separate.
Where was the study published?
In Energy & Environmental Science on 14 October 2026, with Nannan Li as first author.