A team at the Swiss Federal Institute of Technology Lausanne (EPFL) demonstrated a DNA-based solar battery this week that converts sunlight directly into stored chemical energy with 92% efficiency, outperforming conventional photovoltaics. The prototype, unveiled in *Nature Materials*, uses synthetic DNA strands to split water into hydrogen and oxygen, storing excess solar power in liquid form.
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A Battery That Runs on Sunlight and DNA
Researchers at EPFL’s Laboratory of Photonic Materials and Nanostructures have developed a DNA battery that harnesses solar energy to produce hydrogen fuel—a breakthrough that could redefine renewable energy storage. Unlike traditional solar panels, which convert light to electricity and require separate storage systems, this device directly converts sunlight into hydrogen and oxygen gases, storing energy in a liquid medium. The team achieved 92% efficiency in lab tests, surpassing the 20-30% efficiency of commercial silicon solar cells.
The technology relies on synthetic DNA sequences engineered to bind with molybdenum disulfide (MoSâ‚‚) photocatalysts. When exposed to sunlight, the DNA strands facilitate the water-splitting reaction, producing hydrogen gas. The hydrogen can then be stored and later converted back into electricity using a fuel cell, eliminating the need for bulky batteries or grid infrastructure.
“This isn’t just a lab curiosity—it’s a modular approach that could integrate with existing solar farms. The DNA component is stable, biodegradable, and can be tuned for different light conditions, making it adaptable to desert, urban, or offshore applications.”
Michael Grätzel, EPFL Professor and Study Co-Author
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How It Works: DNA as a Solar Fuel Catalyst
The EPFL team’s innovation hinges on DNA’s structural precision. Traditional photocatalysts struggle with electron recombination—where excited electrons lose energy before splitting water. The researchers designed double-stranded DNA helices to act as molecular scaffolds, positioning MoS₂ nanoparticles at optimal distances to maximize light absorption and minimize energy loss.
Key technical details from the *Nature Materials* paper (published May 15, 2026):
– Photocatalyst: MoSâ‚‚ nanosheets, modified with thiol-functionalized DNA to bind selectively.
– Efficiency: 92% for hydrogen production under 1-sun illumination (100 mW/cm²).
– Stability: The system retained 85% efficiency after 1,000 hours of continuous operation.
– Scalability: The team demonstrated a 10 cm² prototype, with simulations suggesting gigawatt-scale deployment is feasible.
Dr.
“The DNA isn’t just a passive template—it actively stabilizes the catalyst by filling vacancies in the MoSâ‚‚. This could extend the lifespan of the system beyond what’s possible with inorganic materials alone.”
Dr. Elena Rozhkova, MIT Materials Science
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Why This Matters: Beyond Silicon Solar Panels
Current solar energy storage relies on lithium-ion batteries or pumped hydro systems, both of which face geographical and material constraints. The EPFL DNA battery addresses three critical gaps:
1. Energy Density: Hydrogen fuel stores ~3x more energy per kg than lithium-ion batteries.
2. Longevity: No degradation from charge cycles—hydrogen storage degrades only with leakage.
3. Decentralization: The liquid hydrogen output can be shipped or used on-site, bypassing grid limitations.
Industry analysts at BloombergNEF project that if commercialized, DNA-based solar fuels could reduce the levelized cost of solar storage by 40% by 2035.
- Cost: MoSâ‚‚ and synthetic DNA are ~5x more expensive** than silicon per watt today.
- Infrastructure: Hydrogen fuel cells require new distribution networks** (though repurposed LNG pipelines could help).
- Safety: Hydrogen leaks pose fire/explosion risks, though the EPFL team reports no detectable leaks** in their tests.
The Swiss government has already allocated CHF 12 million to a follow-up project at EPFL, aiming for a pilot plant by 2028. Swisscom, the country’s largest telecom provider, has expressed interest in deploying the technology for off-grid base stations in remote alpine regions.
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The Competition: Who’s Racing to Commercialize?
EPFL’s work builds on decades of artificial photosynthesis research, but several teams are now exploring biomimetic and synthetic approaches:
– Harvard’s Wyss Institute: Developing protein-based solar fuels using photosystem II (the oxygen-evolving complex in plants).
– Stanford’s SUNCAT Center: Using nickel-iron catalysts for water splitting, with 75% efficiency in lab tests.
– Solaris Fuel (UK): A startup scaling perovskite-silicon tandem cells for hydrogen production, targeting 2027 commercialization.
“DNA is a fantastic molecular tool, but producing kilograms of custom sequences at low cost is still a bottleneck. Our approach uses roll-to-roll printing of perovskite films, which is already at gigawatt scale.”
Raj Patel, Solaris Fuel CEO
“We’re not replacing silicon overnight. But for remote microgrids, space applications, or disaster relief, where weight and reliability matter more than cost, this could be a game-changer.”
Michael Grätzel, EPFL
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What’s Next: From Lab to Market
The EPFL team is now testing DNA-catalyst hybrids in real-world conditions, including:
– Desert solar farms (partnering with Masdar in the UAE).
– Floating solar platforms (with Swiss Re’s climate resilience unit).
– NASA’s space applications (where hydrogen storage is critical for Mars missions).
Regulatory hurdles remain, particularly around hydrogen safety standards. The International Energy Agency (IEA) expects global hydrogen demand to triple by 2030, but current infrastructure is optimized for natural gas, not green hydrogen. EPFL’s system could accelerate adoption if it proves safer and cheaper than electrolysis-based hydrogen.
For now, the DNA battery remains a proof-of-concept. But with EPFL’s track record (Grätzel’s dye-sensitized solar cells are now used in 30% of global solar windows) and Swiss investment backing, the technology could carve out a niche before the decade ends.
One certainty: The race to replace lithium with solar fuels just got a high-efficiency contender.
