In article number 2006683, Alexis Bordet, Walter Leitner, and co‐workers present bimetallic cobalt‐rhodium nanoparticles of precisely controlled Co:Rh ratios synthesized on imidazolium‐based supported ionic liquid phases (CoxRh100−x@SILP) following an organometallic approach. The resulting materials are characterized in detail, and their hydrogenation performances are investigated using multifunctional aromatic substrates as chemical probes. The Co:Rh ratio of the nanoparticles has a critical and synergistic influence on the activity and selectivity controlling in particular the ring hydrogenation of the aromatic moiety.