Self-assembly of binder-free 3D NiMoO4/ZnCo-LDH/NF core/shell architecture for efficient oxygen evolution reaction

Developing cost-effective, robust, and low over-potential exhibiting Oxygen Evolution Reaction (OER) electrocatalysts has been highly desirable for large-scale energy conversion technologies. Herein, we have constructed binder-free 3D core/shell NiMoO4/ZnCo-LDH/NF nanostructural arrays via a facile two-step solvothermal process. These construction of the core/shell structure induced a synergistic electronic coupling effect and efficiently upgraded the rapid charge transfer characteristics, increasing active sites as well as oxygen vacancies on the surface of an electrode material. As a result, core/shell NiMoO4/ZnCo(1:2)-LDH/NF electrode material delivered superior OER over potential value of 252 mV and minimal Tafel slope value of 85.2 mV dec-1 at current density of 10 mA cm-2 in 1 M KOH electrolyte medium. Moreover, due to the strong electronic coupling among the counterparts, which delivered outstanding robust stability over 48 h. These above results advocates that core/ shell NiMoO4/ZnCo(1:2)-LDH/NF electro catalysts owned great potential for future energy conversion technologies.