Metal Hydroxide–Organic Framework Mediated\nStructural Reengineering Enables Efficient NiFe Interaction for Robust\nWater Oxidation

NiFe\nlayered double hydroxide (NiFe LDH) derived oxyhydroxides\nare promising electrocatalysts for the alkaline oxygen evolution reaction\n(OER). However, NiFe LDH with a stable metal–oxygen–metal\n(M–O–M) structure suffers from inadequate NiFe interaction,\nleading to undesirable activity and stability. Herein, we develop\na NiFe hydroxide–organic framework (NiFe HOF) via modification\nof NiFe LDH with an organic linker to break the structural constraint\nof M–O–M and thus boost the OER. NiFe HOF with reconfigurable\nmetal sites facilitates structural reengineering under the OER condition\nto form abundant NiFe interaction and prolonged M–O bonds,\nstimulating lattice oxygen mechanism. Therefore, NiFe HOF shows a\ndistinctly decreased overpotential at 50 mA cm<sup>–2</sup>, which is 68 mV lower than that of NiFe LDH. The anion exchange\nmembrane electrolyzer using NiFe HOF as anode electrode displays ultralong\nstability exceeding 1050 h at 1 A cm<sup>–2</sup> with a low\nattenuation of 0.16 mV h<sup>–1</sup>.