Increasing concerns about rising atmospheric carbon dioxide (CO2) levels prompted scientists to explore ways of converting this greenhouse gas into fuels and organic materials using light.
A general characteristic of photocatalysts is their ability to generate hydrogen by splitting water (H2O), which is also the primary step in CO2 photoreduction. The second and most crucial step is the reduction of CO2 to hydrocarbons.
Further details: Biofuels from CO2 and light