Photovoltaic cells are matured from the academic research into the industrial markets. Organic and organic/inorganic hybrid nanostructures are also candidates for the conversion of CO2 to synthetic fuels using solar energy. This is an important step to make an efficient, large-scale energy storage. At the same time this will make a cyclic and sustainable CO2 economy. We report organic as well as bio-organic catalysts which can be used in photo-electro-catalytic conversion devices. Such bio-catalysts can be enzymes as well as living bacteria immobilized on electrodes. Selectivity of such bio-catalysts is very high and combined with the room temperature operation of such bio-electro-catalytic systems makes them industrially highly attractive.