Light-induced reactions are fundamental for the generation of solar fuels and for a large number of chemical transformations generically known as light to chemistry. A particular case of this, is the light-induced water splitting (h-WS) reaction for hydrogen production, which is considered one of the most promising strategies for the generation of renewable and green energy vectors in the short to medium term. Three key elements are needed to achieve such a transformation: a light absorber, a water oxidation catalyst and a proton reduction catalyst.