Nowadays, the main reason for the increment of the CO2 presence in the atmosphere, which favors the consistency of the layer of gases responsible for the Greenhouse Effect, is the production of energy from fossil fuels. In addition, there are not enough industrial CO2 conversion processes that can overweight the increasingly amount of the gas generated as waste from many industries like thermal power plants or oil/gas refinery. In response to such problematic, the SunCoChem European Project in which this thesis work is involved, proposes an alternative for a better utilization of carbon dioxide, that includes its photo-electrochemical reduction into CO as an intermediate for the generation of oxo-products for the chemical industry.