從曬傷到超強能量：DNA啟發式太陽能儲存突破

Grace Han, a chemistry professor, moved from Boston to California and quickly noticed how much stronger the sun was there. She found that her skin would start to feel irritated after just a few hours outside, so she began wearing a wide-brimmed hat, sunglasses, and plenty of sunscreen. As a scientist, Grace was curious about why the sun affected her skin so much. She started reading about DNA photochemistry, which is the study of how sunlight changes the DNA in our skin. She learned that when the sun shines on our skin, it can make the DNA molecules twist into a different shape. These molecules can later return to their normal shape, and when they do, they release energy.

This discovery gave Grace an idea. She wondered if these molecules could be used to store energy from the sun and then release it when needed. This idea is called molecular solar thermal energy storage, or Most for short. Grace and her team at the University of California, Santa Barbara, began experimenting with these molecules. They created a system that could store a lot of energy. In one experiment, they put the molecules in a vial with water. When they triggered the molecules to release their energy, the water boiled very quickly. Grace was amazed by how fast it happened. Her team used computer models to predict how the molecules would behave, and the results were even better than expected. Other scientists were impressed too, saying that Grace's system could store more energy than the lithium-ion batteries used in phones and electric cars.

However, there are still some challenges to overcome. The system needs a special kind of ultraviolet light to make the molecules change shape, and this type of light is not very common in sunlight. Also, to release the stored energy, the team had to use hydrochloric acid, which is a dangerous chemical. Grace hopes that in the future, they can find a way to use regular sunlight and safer chemicals. The ultimate goal is to use this technology to heat homes and buildings without burning fossil fuels, which would help reduce pollution. Some scientists are working on making solid versions of the technology, like window coatings that could warm up rooms. While there are still obstacles, Grace and her team are excited to keep improving this new way to store solar energy. They believe that with more research, it could become a useful and clean way to provide heat and energy in the future.