In situ growth of well-ordered NiFe-MOF-74 on Ni foam by Fe²⁺ induction as an efficient and stable electrocatalyst for water oxidation

Abstract

Well-ordered NiFe-MOF-74 is in situ grown on Ni foam by the induction of Fe2+ and directly used as an OER electrocatalyst. Benefited from the intrinsic open porous structure of MOF-74, the in situ formed MOF arrays and the synergistic effect of Ni and Fe, outstanding water oxidation activity is obtained in alkaline electrolytes with an overpotential of 223 mV at 10 mA cm-2.

Heterometallic Feed Ratio‐Dominated Oxygen Evolution Activity in Self‐Supported Metal‐Organic Framework Nanosheet Arrays Electrocatalyst

“…With the further increased Fe amount, the charge increases slightly (Figure S4, Supporting Information). Thus, the partial substitution of active Ni II by Fe III species has significantly adjusted the electronic structure of the resultant nanomaterials, which is highly important for the manipulations of the electrocatalytic activity …”

“…The electrocatalytic activity of the optimized Fe 0.89 Ni 0.11 ‐BDC/NF are comparable with diverse NiFe‐based MOF nanomaterials with different substrates (NF and NiFe alloy foam), organic ligands (1,4‐bezenedicarboxylate, 2‐aminoterephthalate, and 2,5‐dihydroxybenzenedicarboxyate) and morphological structures (crystalline grain, nanoployhedrons, nanocluster, rod‐like nano‐crystals, and nanosheet with different thickness, Table S2, Supporting Information). Also, the optimized Fe 0.89 Ni 0.11 ‐BDC/NF is much better than the self‐supported NiCo‐ NiCu‐, FeCo‐, and FeCoNi‐derived MOF electrocatalysts (Table S2, Supporting Information) …”

High Efficiency FeNi‐Metal‐Organic Framework Grown In‐situ on Nickel Foam for Electrocatalytic Oxygen Evolution

“…However, their porous structure is destroyed, which reduces their active sites . MOF materials are used directly as electrocatalysts ,. In this way, the porous MOF structure that is formed by ligands and metal ionic bonds can expose many unsaturated metal sites, which enhances the electrocatalytic performance .…”

Ni(ii)-based coordination polymers for efficient electrocatalytic oxygen evolution reaction

“…[13][14][15] However, a handful of examples such as Fe-Co-MOFs or Co-Ni-MOFs have been explored due to instability, poor conductivity and harsh synthesis conditions. [16][17][18][19][20] Notably, the disadvantages of MOFs have limited their usage in the potential OER. Therefore, it is urgent to develop cheap, stable and active OER catalysts to replace the precious metals.…”