Being able to store renewable energy, such as that produced by sunlight, so that it can be used at night or on cloudy days remains a major challenge. In recent years, researchers have been looking into molecular solar thermal (MOST) energy storage systems that harness the energy from photons and release it when needed. Now, a joint US team from Grace Han’s lab at the University of California, Santa Barbara, and Kendall Houk’s lab at the University of California, Los Angeles, has published details of a bio-inspired pyrimidone-based molecule that, when highly strained, stores a record amount of photon energy in its chemical bonds. The energy released when the molecule is allowed to relax is enough to boil water, the researchers say.

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