A prototype solar device has been unveiled which mimics plant life, turning the Sun's energy into fuel. The machine uses the Sun's rays and a metal oxide called ceria to break down carbon dioxide or water into fuels which can be stored and transported.
Conventional photovoltaic panels must use the electricity they generate in situ, and cannot deliver power at night
Full article/source - http://www.bbc.co.uk/news/science-environment-12051167