‘Light in a bottle’ liquid can harvest and store energy from multiple sources

A new type of liquid can harvest and store energy from light to act as a rechargeable power source. The liquid contains a molecule that absorbs electrons from light, which prompts a restructure into a jelly-like substance. This gel remains stable for months at a time and can release the stored electrons upon contact with oxygen to power chemical reactions. The research is still in very early stages, but such a metal-free energy storage system could one day be useful to power small devices such as smartwatches.