Silver Nanoparticle-Decorated NiFe-MOFs as Highly Active Electrocatalysts for Overall Water Splitting

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Designing clean, stable, and efficient electrocatalysts is the key to achieving overall water splitting. The introduction of active metals or metal nanoparticles into metal–organic frameworks (MOFs) is a research strategy. In this work, silver nanoparticles (Ag NPs) loaded on NiFe-MOF can increase the surface area, active sites, and conductivity of the catalyst. Therefore, the electrocatalytic performances of Ag/NiFe-MOF exhibit higher activity for HER and OER in an alkaline medium, and the overpotential is also significantly lower than that when NiFe-MOF is used alone. When the current density is 10 mA cm –2, the overpotential of the optimized Ag/NiFe-MOF-30 catalyst is 138 mV for HER and 173 mV for OER. In addition, when Ag/NiFe-MOF-30 is used as a bifunctional electrocatalyst, the overall water splitting can be achieved with 1.61 V at 10 mA cm –2, and it demonstrates excellent stability of over 100 h at 100 mA cm –2 . This work provides an efficient approach for developing highly active MOF-based catalysts by loading coin metal nanoparticles for overall water splitting.

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