Ultrathin Fe-MOFs modified by Fe₉S₁₀ for highly efficient oxygen evolution reaction

Developing efficient and economical catalysts is essential for water splitting. The application of MOF catalysts in water splitting is limited by poor conductivity; however, the introduction of conductive TMS could enhance their activity. Herein, novel composite Fe₉S₁₀/Fe-MOF/NF-2 was constructed by introducing dendritic Fe₉S₁₀ onto the surface of a 2D ultrathin Fe-MOF. Composite catalysts elaborately utilize the structural and chemical advantages of MOF and TMS while improving the deficiencies of monomers through the combination. Owing to the optimal structure, the hybrid catalyst Fe₉S₁₀/Fe-MOF/NF-2 displayed better catalytic performance than bare Fe-MOFs and Fe₉S₁₀, with low overpotentials of 202 and 216 mV at 10 mA cm^-2 in alkaline solution and simulated seawater, respectively. This work provides an innovative approach to modify MOFs as electrocatalysts for OER.