Synergistic ruthenium single-atom and nanoparticles in nickel as cooperative catalysts for the alkaline hydrogen evolution reaction. - Khalil G; Dias-Fernandes MS; Bawari S; Li L; Muthuraj C; Ducrozet F; Kwak M; Comesaña-Hermo M; Zitolo A; Steinmann SN; Boettcher SW; Tard C; et al. (Nanoscale, 2026)