Hydrogen is the molecule that makes Power-to-X possible. Combine renewable hydrogen with recycled CO₂ and you can synthesise the e-fuels and e-chemicals that defossilise aviation, shipping and heavy industry. Yet the hydrogen itself remains the bottleneck: around 95% of today’s production still relies on fossil fuels, and the cleaner alternatives are either energy-hungry or costly. A new result from the University of Birmingham points to a cooler — and potentially cheaper — way to make it.
A catalyst that works at much lower temperatures
One route to hydrogen is thermochemical water splitting, in which a catalyst separates water into hydrogen and oxygen using heat. The catch has always been temperature. Conventional thermochemical systems split water at roughly 700–1,000 °C, and regenerating the catalyst for the next cycle can demand 1,300–1,500 °C — temperatures that are difficult and expensive to supply cleanly.
A team led by Professor Yulong Ding at the University of Birmingham’s School of Chemical Engineering, working with the University of Science and Technology Beijing, reports that a perovskite catalyst can bring those numbers down sharply. The material — a group known as BNCF perovskites, made from barium, niobium, calcium and iron, with a variant called BNCF100 performing best — generated substantial amounts of hydrogen at 150–500 °C and could be regenerated at 700–1,000 °C, roughly 500 °C lower than current approaches. In testing it kept producing hydrogen over ten cycles, with X-ray diffraction showing little structural change, suggesting good stability. The ingredients are relatively abundant, non-toxic and do not require complex manufacturing.
Why this matters for Power-to-X
The temperature drop is what makes this interesting for the Power-to-X community. Foundation industries — steel, cement, glass and chemicals — throw off enormous quantities of waste heat that today mostly goes unused. A process that runs at 150–500 °C could, in principle, be powered by that recovered heat, or sited next to renewable energy plants. As Professor Ding put it, producing hydrogen locally would sidestep the storage and transport hurdles that add cost and complexity, "enabling the uptake of hydrogen fuel without the need for costly infrastructure."
For Power-to-X, cheaper and more locally available renewable hydrogen strengthens the feedstock side of the equation. The closer and cheaper the hydrogen, the more competitive the downstream synthesis of e-fuels and e-chemicals from renewable energy with recycled CO₂ becomes.
The cost question
The researchers also ran a preliminary techno-economic analysis. Their early figures suggest the perovskite route could produce hydrogen more cheaply than both green hydrogen (electrolysis of water) and blue hydrogen (from methane with carbon capture and storage), with the advantage strongest in regions where renewable electricity is inexpensive, such as Australia. These are preliminary estimates rather than demonstrated production costs, so they should be read as a promising signal, not a settled result.
Early days — but a direction worth watching
This is still laboratory-stage work. Ten cycles is encouraging but far from the thousands of hours of durability a commercial system needs, and the climate benefit hinges entirely on the heat input being genuinely recovered waste heat or renewable heat rather than freshly burned fossil fuel. University of Birmingham Enterprise has filed a patent on the BNCF catalysts and is now looking for partners to scale the technology in the UK and Europe — the stage where many promising catalysts either prove themselves or stall.
The SPIN perspective
Every credible path to cheaper, lower-temperature renewable hydrogen matters, because hydrogen is the foundation on which Power-to-X is built. Pairing renewable hydrogen with recycled CO₂ is how we defossilise the sectors that cannot simply be electrified. The decisive condition, as always, is that the energy going in is clean: a low-temperature catalyst is only a defossilisation tool if it draws on recovered or renewable heat — not if it becomes a reason to keep burning more fossil fuel.
Journal reference: Biduan Chen, Wenyi Huang, Wei Guo, Lige Tong, Yulong Ding, Li Wang. "Remarkable thermochemical water-splitting on Ba₂Ca₀.₆₆Nb₁.₃₄₋ₓFeₓO₆₋δ perovskites at medium temperatures for hydrogen production." International Journal of Hydrogen Energy, 2026; 236: 152637. DOI: 10.1016/j.ijhydene.2025.152637. Source: University of Birmingham via ScienceDaily.