The technology could eventually help factories, vehicles and electronic devices recover energy that is currently lost.
Factories around the world release enormous quantities of heat into the environment. Steel furnaces, chemical plants, vehicle engines and electronic equipment all generate temperatures that represent potentially recoverable energy.
Now researchers in Japan have reported a striking advance: a thermoelectric material whose key performance measure improved by approximately 250 times following the addition of a small amount of titanium.
The discovery, published in the Journal of Materials Chemistry A on 12 October 2026 and highlighted internationally by Tohoku University on 29 October, could open new possibilities for converting industrial waste heat into electricity.
By adding titanium at concentrations ranging from 4.6% to 9.3% of the atoms, they reduced defects in the material's crystalline structure and substantially improved the movement of electrons.
“From 1 to 250 — what actually improved? The scientists studied chromium nitride, a material that can be deposited as extremely thin films.”
EuroAsia.News, reporting from Tokio
Electron mobility increased by approximately two orders of magnitude — roughly a factor of 100.
The resulting material achieved a thermoelectric power factor of 5.26 microwatts per centimetre per square kelvin, approximately 250 times that of untreated chromium nitride.
The power factor measures how effectively a material can generate electrical power from a temperature difference under comparable conditions.
Importantly, this does not mean that a factory using the material would suddenly recover 250 times more electricity. Real-world performance also depends on heat flow, device geometry, thermal conductivity and operating conditions.
Nevertheless, the improvement is remarkable for a material manufactured without the high-temperature processing required by many competing technologies.
A working generator — but still microscopic
The Japanese team went beyond laboratory measurements by constructing a small thermoelectric generator on glass.
With a temperature difference of 96 kelvin — equivalent to a difference of 96 degrees Celsius — the prototype generated a maximum electrical output of 455.8 nanowatts.
That equals approximately 0.000000456 watts.
For comparison, a conventional 10-watt LED lamp consumes more than 20 million times that amount of power.
The comparison illustrates both the promise and the present limitations of the technology. The prototype is a miniature experimental device, not a commercially deployable industrial generator.
Researchers also reported a power density of 38 milliwatts per square centimetre when normalized to the thin film's cross-sectional area, a value comparable to some high-performance thermoelectric materials.
That specific measurement must not be interpreted as electricity output per square centimetre of factory wall or solar-panel-like surface.
Why room-temperature manufacturing matters
Many advanced thermoelectric materials require elevated temperatures during production, increasing manufacturing complexity and restricting the substrates onto which they can be deposited.
The Japanese approach uses reactive sputtering to create films at approximately room temperature.
This potentially makes the material suitable for electronics, glass and other surfaces that cannot tolerate extreme fabrication temperatures.
It could also offer opportunities in industrial sensors and small devices that currently rely on batteries.
Thermoelectric generators have another advantage: unlike turbines or conventional engines, they contain no moving mechanical parts.
That makes them attractive for applications where maintenance access is difficult or reliability is critical.
How much energy could industry recover?
Consider an industrial system releasing 100 megawatts of waste heat.
If a future energy-recovery technology could convert just 5% of that heat into electricity, the result would be 5 megawatts of electrical power.
Operating continuously, that would produce approximately 43.8 gigawatt-hours annually — enough to supply roughly 12,000 households consuming 3,650 kilowatt-hours each year.
This is an illustrative calculation, not a performance claim for Tohoku's experimental film.
Achieving such output would require engineering advances and demonstration at a scale vastly larger than the current prototype.
The next challenge: commercial scale
The researchers must now address manufacturing costs, durability, thermal efficiency and the difficulty of combining large numbers of microscopic devices into useful generators.
Their findings nevertheless demonstrate that carefully modifying a material's atomic structure can unlock performance improvements previously considered difficult to achieve.
For energy-intensive economies such as Germany, Japan, China and South Korea, technologies capable of recovering wasted industrial energy could eventually reduce operating costs and emissions.
The 250-fold improvement is not yet an energy revolution. But it provides a new route toward turning a small portion of the world's enormous waste-heat flows into useful electricity.
