ZIF-67-derived supported NiFe-LDH composite bimetallic sulfides (Ni Fe) with hierarchical structure for efficient oxygen evolution reaction

Hydrogen is the most suitable green energy for the current era, and electrolyzing water to produce hydrogen is the most efficient preparation method. The development of efficient oxygen evolution reaction (OER) electrocatalysts is crucial for sustainable energy conversion. In our work, we construct a hierarchical CNFS@NiFe-LDH/NF heterostructure by integrating ZIF-67-derived cobalt sulfide with nickel‑iron layered double hydroxide (LDH) and bimetallic sulfides on nickel foam (NF). This composite synergistically combines the high surface area and active sites from the MOF-derived sulfide, the tunable layered structure and abundant -OH groups from the LDH-which facilitate OH − adsorption and O O formation-as well as electronic modulation effects from the bimetallic sulfides. The catalyst exhibits excellent OER performance with an overpotential of 236 mV at 10 mA cm −2 and a Tafel slope of 42.23 mV dec −1 under alkaline conditions, and maintains high conductivity and low charge transfer resistance throughout operation. Meanwhile, the catalyst showed excellent stability for at least 66 h during the OER process at 50 mA cm −2 , which demonstrates outstanding durability. Moreover, this catalyst have satisfactory hydrophilicity/aerophobicity. This work provides an effective strategy for designing high-performance and stable electrocatalysts via heterogeneous interface engineering.