Cobalt and Ruthenium Co-doping Activated Molybdenum Disulfide for Alkaline Electrocatalysis Oxygen Evolution Reaction

• Successful design of Ru, Co co-doped MoS 2 OER electrocatalyst . • Ru, Co co-doped MoS 2 system improves adsorption and activation of H 2 O. • Ru, Co double doping enhances the intrinsic conductivity of MoS 2 catalysts. • Ru, Co co-doped MoS 2 was stabilized at a current density of 10 mA cm -2 for 120 h. Two-dimensional molybdenum disulfide (MoS 2 ) is recognized as a promising non-precious metal energy conversion electrocatalyst . Nonetheless, the development of MoS 2 based oxygen evolution reaction (OER) electrocatalysts with high performance is still challenging. Herein, we developed a bimetallic (Ru and Co) co-doped MoS 2 catalyst through a facile hydrothermal approach for highly efficient OER. Experimental results combined with theoretical calculations demonstrate that, compared to single-element (Ru or Co) doping, the synergistic effect of dual doping with Ru and Co further unleashes the superior OER performance potential of MoS 2 . During the electrocatalytic OER process, the Mo atoms adjacent to the Ru and Co dual-doped sites adsorb *OH, subsequently forming a Mo-O-Ru transition state with the Ru atom. Simultaneously, the doping of Co regulates the electronic structure of adjacent Mo atoms and enhances the formation of * to *OH. Remarkably, the as-prepared Ru,Co co-doped MoS 2 not only displayed a relatively low overpotential of 342 mV at 10 mA/cm 2 current density in 1.0 M KOH electrolyte compared to incorporating only Ru or Co but also performed excellent long-term stability for 120 h. This study provides a novel strategy and theoretical guidance for modifying MoS 2 to achieve highly efficient OER catalytic activity.