The H-GREEN project aims to address the global energy crisis by advancing pioneering technologies and materials in the photo-, pyro-, and electro-catalysis of water splitting. The project will leverage the unique properties of functional oxide materials to facilitate the cost-effective production of green hydrogen through water splitting, aligned with climate objectives in Europe. The expert consortium consists of fundamental research organizations and industrial companies with the expertise needed to solve this critical problem. Through secondments and knowledge-sharing training, we will equip a new cluster of material scientists with the skills and expertise needed to develop H-GREEN technologies that will power the world sustainably