MoSi₂ Breakthrough Could Turn Industrial Waste Heat Into Electricity, Scientists Report

What happened: Researchers at Tokyo University of Science identified MoSi₂ as a material capable of generating electricity from heat using a rare transverse thermoelectric effect....

What happened: Researchers at Tokyo University of Science identified MoSi₂ as a material capable of generating electricity from heat using a rare transverse thermoelectric effect.
Why it matters now: Industries lose 20 to 50 percent of energy as heat, and this discovery could improve efficiency and reduce emissions.
What changes for people: Future devices may power sensors, portable electronics, and energy systems without additional fuel.
Who is affected: Manufacturing sectors, energy companies, researchers, and clean-tech developers exploring new power solutions.

A team led by Associate Professor Ryuji Okazaki at Tokyo University of Science (Japan) has demonstrated that the semimetal MoSi₂ can convert waste heat into electricity through a sideways energy flow mechanism. The findings, published in Communications Materials with DOI 10.1038/s43246-025-01050-4, highlight a new path toward more efficient thermoelectric devices at a time when industries are searching for cleaner energy solutions.

Why waste heat is becoming a major energy target

Across heavy manufacturing and fossil fuel systems, a large share of energy disappears as unused heat. Researchers estimate that 20 to 50 percent of input energy is lost during industrial processes.

Recovering even a fraction of this heat could lower operational costs and reduce environmental impact. Experts say thermoelectric technologies are attractive because they generate electricity directly from temperature differences without moving parts or combustion.

For mobile readers, the key takeaway is simple: improving waste heat recovery could translate into lower emissions, smarter infrastructure, and more efficient power systems.

Limits of traditional thermoelectric designs

Most existing thermoelectric devices rely on the longitudinal thermoelectric effect, where electricity flows in the same direction as heat. These systems typically require stacks of p-type and n-type semiconductors connected in layers.

While effective, this architecture creates multiple electrical interfaces. Scientists note that these connections increase resistance and cause energy losses, limiting real-world performance.

Because of these limitations, researchers have been searching for alternative approaches that reduce complexity and improve efficiency.

How the transverse thermoelectric effect changes the game

The new study focuses on the transverse thermoelectric (TTE) effect, where voltage is generated perpendicular to heat flow. This design allows devices to be built from a single material, reducing contact resistance and simplifying manufacturing.

According to the research team, materials capable of strong transverse responses are rare. Their experiments revealed that MoSi₂ displays clear axis-dependent conduction polarity, a property linked to efficient transverse energy conversion.

Researchers confirmed a strong transverse thermopower signal, suggesting MoSi₂ could enable simpler and more efficient heat-to-electricity systems.

Inside the experiments: What scientists measured

The team examined resistivity, thermal conductivity, and thermopower across different crystallographic axes of MoSi₂. Using advanced calculations and laboratory testing, they found that its electronic structure includes a mixed-dimensional Fermi surface with opposing polarities.

This unusual structure appears to drive the material’s transverse response. Hall resistivity measurements supported the findings, strengthening confidence in the results.

Compared with tungsten disilicide (WSi₂), another candidate studied previously, MoSi₂ showed a larger transverse signal due to differences in electron distribution.

Expert insights and official remarks

Dr. Okazaki said the team aimed to identify materials with axis-dependent conduction polarity, which researchers now consider an indicator of transverse thermoelectric potential.

He explained that mixed-metal conductors like MoSi₂ had not been fully explored before, making the discovery significant for future device development.

The researchers describe MoSi₂ as an “ideal material” for transverse thermoelectric applications, especially at lower temperatures.

Potential impact on industry, energy, and technology

If further validated, the material could influence several sectors:

Public safety and infrastructure: Self-powered sensors could monitor remote environments without frequent battery replacements.
Energy and economy: Improved waste heat recovery could lower industrial fuel demand and operational costs.
Technology manufacturing: Single-material devices may simplify production and improve durability.
Global sustainability goals: Efficient heat recycling aligns with efforts to reduce carbon emissions worldwide.

Scientists caution that practical deployment will require engineering advances, including thin-film fabrication and large-scale testing.

What comes next for thermoelectric research

The study suggests that materials with mixed-dimensional electronic structures could form the next generation of thermoelectric technology. Researchers are likely to explore other semimetals with similar properties to expand the range of usable materials.

Further experiments and prototype devices will determine whether MoSi₂ can move from laboratory research into real-world energy systems.

What to watch next

Researchers will focus on scaling production methods and testing performance in industrial environments. Watch for updates as scientists investigate whether this discovery can translate into commercial waste heat recovery solutions.