The production of green and renewable energy plays a key role in all future energy scenarios towards the zero-emission transition that has to be tackled in the next 30 years. The rapid inter-conversion of electricity into chemical energy offers an important avenue for the use of renewable energy to replace fossil fuels. The generation of electricity in fuel cells from the electrochemical reaction of H2 and O2, coupled with the photoelectrochemical water splitting to produce oxygen and hydrogen gases and the valorization of CO2 through its conversion into solar fuels are also strongly related with the concepts of circular economy. Hence, the study of materials able to efficiently harvest and transform solar energy is highly necessary. Moreover, due to the intermittent character of the solar energy, adequate energy storage and conversion st