The urgently needed defossilisation of the energy system requires not only the drastic expansion of renewable electricity but also the development of alternative, sustainably produced material energy sources. A central task here is to develop new types of catalysts to ensure efficient conversion of chemical energy into electrical energy and vice versa - the core of CatLab. The Helmholtz-Zentrum Berlin (HZB), Fritz-Haber-Institut der Max-Planck-Gesellschaft (FHI), and Max-Planck-Institut für Chemische Energiekonversion (CEC) bundled their competencies in catalysis research, thin film, nanotechnology, and operando analysis, to give life to CatLab. In synergy with the Humboldt University of Berlin, the partners of UniSysCat and the industry, CatLab aims to generate pioneering knowledge and provide vital technological solutions for the establishment of a green hydrogen economy.