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Metal-organic frameworks (MOFs) as versatile templates for preparing transition metal compounds has received wide attention. Benefiting from their diversified spatial structure and controllable chemical constituents, they have become a research hotspot in the field of electrocatalytic water splitting. Herein, Fe 2 Ni-MIL-88B MOF on nickel foam (Fe 2 Ni MOF/NF) has been prepared through a one-pot method growth process. Compared with Fe MOF/NF and Ni MOF/NF, the interaction between Fe 3+ and Ni 2+ in Fe 2 Ni MOF/NF accelerates the electron transfer through the oxygen of the ligand, leading to increased 3d orbital electron density of Ni, which enhances the activity of the oxygen evolution reaction (OER) in alkaline solution. Fe 2 Ni MOF/NF provides a current density of 10 mA cm -2 at a low overpotential of 222 mV, and its Tafel slope is also very small, reaching 42.39 mV dec -1 . The success of the present Fe 2 Ni MOF/NF catalyst is attributed to the abundant active centers, the bimetallic clusters Fe 2 Ni-MIL-88B, the positive coupling effect between Ni and Fe metal ions in the MOF, and synergistic effect between the MOF and NF. Besides, Fe 2 Ni MOF/NF possesses excellent stability over 50 h of continuous operation, providing feasibility for commercial use.

Preparation of an Fe2Ni MOF on nickel foam as an efficient and stable electrocatalyst for the oxygen evolution reaction

Preparation of an Fe₂Ni MOF on nickel foam as an efficient and stable electrocatalyst for the oxygen evolution reaction