Steel mills, cement factories, and glass furnaces heat their facilities to up to 2,000 degrees Celsius and lose enormous amounts of heat to the surrounding air. Industries have so far left this waste heat sitting like an untapped fuel reserve. A new perovskite catalyst from the University of Birmingham now enables this waste heat to be transformed through water splitting into clean hydrogen, at temperatures roughly 500 degrees Celsius lower than previous methods.
The temperature problem of the hydrogen economy
Hydrogen is considered one of the most important energy carriers for decarbonizing industries that are difficult to electrify: steel, cement, chemicals, and shipping. The problem is production. Green hydrogen from renewable electricity via electrolysis is the cleanest option, but also the most expensive and dependent on electricity availability. Blue hydrogen from natural gas with carbon capture is cheaper but remains fossil-based.
Thermochemical water splitting offers a third option: water is split into hydrogen and oxygen by heat rather than by electricity. The problem has been the required temperature. Previous thermochemical catalysts for this reaction required 700 to 1,000 degrees Celsius and even 1,300 to 1,500 degrees for catalyst regeneration. Industrial waste heat typically provides 150 to 500 degrees, which made the process useless for most plants.
The BNCF100 catalyst from Birmingham
The team led by Professor Yulong Ding from the School of Chemical Engineering at the University of Birmingham developed, in collaboration with the University of Science and Technology Beijing (USTB), a perovskite catalyst that closes this temperature gap. The catalyst, designated BNCF100, consists of barium, niobium, calcium, and iron, common materials without toxic substances and without complex manufacturing processes.
According to the study published in the International Journal of Hydrogen Energy on April 30, 2026, BNCF100 produces hydrogen at 150 to 500 degrees Celsius. Catalyst regeneration occurs at 700 to 1,000 degrees, thus 300 to 500 degrees lower than previous approaches. Over ten cycles, the catalyst retained its hydrogen production capability with minimal structural changes. Ding explained that the key is that this perovskite compound absorbs oxygen at significantly lower temperatures than previously thought possible in its crystal structure.
In comparison: The untapped heat potential of industry
The potential for waste heat as an energy source is considerable. According to McKinsey analysis, at least 3,100 terawatt hours of thermal energy annually are unused as industrial waste heat globally. In the EU alone, a 2018 study estimated industrial waste heat potential at approximately 305 terawatt hours per year. Of these, 78 terawatt hours lie precisely in the temperature range of 200 to 500 degrees, the range BNCF100 can directly use.
Cost analysis by the Birmingham group shows that the waste heat approach is economically competitive with green and blue hydrogen, especially in regions with inexpensive renewable electricity.
A structural advantage is decentralization: hydrogen transport is challenging because hydrogen has very low energy content per volume unit at standard conditions. Steel mills or cement factories that produce hydrogen locally from their own waste heat bypass this logistics problem entirely and can use the hydrogen directly in their own high-temperature processes.
What still remains before industrial deployment
Previous results come from laboratory experiments. The leap to industrial application is not trivial: catalysts must function in larger facilities under real conditions with impurities in exhaust streams, over months and years without performance decline. How quickly pilot projects might follow, Ding and his team have not specified.
The University of Birmingham Enterprise has filed a patent application for the BNCF catalysts and is seeking industrial partners for commercialization in Britain and Europe. What is missing is a first industrial partner with suitable waste heat stream and economic incentive for a pilot trial at technical scale. In sectors like steel and cement, where decarbonization pressure is growing and cheap reduction options are scarce, interest should emerge quickly.