Randomly mixed atoms arranged in rows for sustainable catalysis Unify order and disorder? This is possible with epitaxial solid solutions, which serve as a platform for understanding new electrocatalysts. (Nanowerk News) The energy system of the future will require sustainable catalysts that, for example, enable the efficient production of green hydrogen. Atoms from five directionsTo produce complex solid solutions, the researchers use a combinatorial coating system (co-sputtering) that fires atoms of the five selected source elements onto a wafer from five different directions. Further investigations in the group of Professor Christina Scheu of Max-Planck-Institute for Sustainable Materials showed, that the epitaxial films feature an interesting defect structure.