Technology News: Emerging Tech: Power Plant: One Small Leaf Could Electrify an Entire Home: Scientists at MIT have created what may be the first practical artificial leaf -- a device about the size of a playing card capable of splitting water into hydrogen and oxygen and storing the energy in a fuel cell. Placing the leaf it in a single gallon of water in sunlight could produce enough electricity to supply a house in developing countries with its daily electricity requirement, according to researchers.