Using artificial photosynthesis to produce hydrogen
The intent is to create an artificial catalyst that can use the same chemical mechanism as photosynthesis to extract hydrogen from water with only sunlight as the power source. They have a created a cluster of manganese, calcium and oxygen atoms that when combined with water and sunlight produces molecular oxygen, along with protons and electrons which could be combined into hydrogen. This could conceivably provide a very efficient carbon-free method of producing hydrogen which could be done locally wherever you have water and sunlight, which rules out places like Seattle and England.
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