DNA-Inspired Molecules Could Revolutionize Solar Heat Storage

BBC Business reported Wednesday that a chemistry professor’s irritating brush with California sunshine has led to a potentially transformative breakthrough in molecular solar thermal energy storage — one that could help decarbonise one of the world’s most stubborn emissions problems.

DNA and the Mousetrap Principle

Professor Grace Han, a chemist at the University of California, Santa Barbara, found her inspiration in an unlikely place. Researching DNA photochemistry for leisure, she noticed that skin cells damaged by ultraviolet light undergo a molecular shape change under sun exposure. That triggered a key idea. Certain molecules can be coaxed into a strained configuration by sunlight, storing energy in the process. When prompted to revert, they release that stored energy as heat. Scientists describe the mechanism as similar to setting and later springing a mousetrap.

This class of technology, known as molecular solar thermal — or MOST — energy storage, has attracted scientific interest for decades. The appeal is significant. These systems operate without combustion and can retain stored energy for months or even years.

A Record-Breaking Result

Han and her colleagues published their findings in February, describing what researchers say is the most energy-dense MOST system demonstrated to date. Their molecule achieved 1.65 megajoules of stored energy per kilogram. That figure meaningfully surpasses the energy density of conventional lithium-ion batteries, the dominant technology in smartphones and electric vehicles.

The practical demonstration was vivid. Molecules loaded into a vial generated enough rapid heat release to boil water in a miniature container almost instantly, BBC Business reported. Han’s students delivered the result to her on video.

Kasper Moth-Poulsen, a MOST researcher at the Polytechnic University of Barcelona who was not involved in the study, praised the outcome directly. His own best systems reached roughly one megajoule per kilogram. Han’s team cleared that benchmark by a wide margin.

Limitations Still on the Table

The system carries real-world constraints. The wavelength of light needed to trigger the molecules sits at 300 nanometres, a range of ultraviolet radiation that reaches Earth’s surface only in small quantities. The release mechanism also currently requires hydrochloric acid, a corrosive substance that needs neutralising after each use.

Han acknowledges both problems and says improving the system’s sensitivity to natural light and replacing the toxic trigger are priority goals.

The Heating Problem Remains Enormous

Heating accounts for a large share of global fossil fuel consumption and has proven exceptionally difficult to clean up. MOST technology, proponents argue, stores solar energy chemically rather than electrically, bypassing the need to burn anything at all. That distinction could matter at scale.

Further development timelines remain unclear, but the energy density milestone marks a meaningful step forward for the field.

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