Paper in Science from UC Santa Barbara describes a pyrimidone-based molecule that stores solar energy chemically at 1.6 MJ/kg and releases it as heat on demand.
Key Takeaways
The system is Molecular Solar Thermal (MOST) storage: sunlight shifts the molecule into a high-energy strained state; a heat or catalyst trigger snaps it back, releasing heat.
Energy density exceeds 1.6 MJ/kg, beating conventional lithium-ion (~0.9 MJ/kg) and prior optical energy-storage switches.
Stability was validated via UCLA computational modeling (Ken Houk); stored energy retention projected over years without significant loss.
Practical demo: material released enough heat to boil water under ambient conditions, a first for this class of MOST materials.
Proposed use cases include water-soluble fluid circulating through rooftop collectors by day, stored in tanks releasing heat at night, with no separate battery system required.
Hacker News Comment Review
Commenters flagged the standard gotchas for chemical energy storage breakthroughs: exotic ingredients, dangerous failure modes, and operational complexity that rarely survives scaling.
Skepticism centers on whether DNA-inspired reversibility translates to real-world durability and cost at volume, not on the energy density claims themselves.
Notable Comments
@metalman: lists the typical failure modes for reversible chemical storage – “exotic wildly expensive ingredients, dangerous failure modes, or very complicated operational requirements” – as the key hurdles to watch.
