Zr-MOF/NiS₂ hybrids on nickel foam as advanced electrocatalysts for efficient hydrogen evolution

As a typical transition-metal sulfides (TMS), nickel disulfide (NiS₂) has attracted great attention in terms of hydrogen evolution reaction (HER). Howbeit, owing to the poor conductivity, slow reaction kinetics and instability of NiS₂, its HER activity is still necessary to be improved. In this work, we designed hybrid structures consisting of the nickel foam (NF) as a self-supporting electrode, NiS₂ derived from the sulfuration of NF and Zr-MOF grown on the surface of NiS₂@NF (Zr-MOF/NiS₂@NF). Due to the synergistic effect between the different constituents, the obtained Zr-MOF/NiS₂@NF demonstrates ideal electrochemical hydrogen evolution ability in acidic and alkalescent environment, reaching a standard current density of 10 mA cm^-2 at overpotentials of 110 and 72 mV in 0.5 M H₂SO₄ and 1 M KOH electrolytes, respectively. What is more, it also maintains excellent electrocatalytic durability for 10 h in both electrolytes. This work could provide a useful guidance on effectively combining metal sulfide with MOF for high-performance HER electrocatalysts.