http://www.ecofriend.org/entry/artifici ... -of-water/
After receiving $400 million in funding, ARPA-E’s first conference witnessed MIT chemist Dan Nocera proving that artificial photosynthesis could power an entire household using just sunlight and a bottle of water. Nocera has developed a special catalyst that splits water into its constituents that is hydrogen and oxygen, which can provide enough energy to run a house.