Sponge Rod‐Like MIL‐88A(Fe)‐CA_0.3 for Efficient Oxygen Evolution Reaction

Abstract Efficient and economical catalysts for electrocatalytic water splitting are crucial elements in meeting human energy needs. Developing and constructing metal‐organic frameworks (MOFs) as electrocatalysts presents a promising solution to alleviate energy challenges. Nevertheless, the utilization of MOFs‐based materials as electrocatalysts is still facing many problems, including blocked structures, rare catalytic sites, and poor conductivity. Introducing defects in MOFs can solve these limitations. In this work, a sponge rod‐like MOF (MIL‐88A(Fe)‐CA 0.3 ) was synthesized by introducing defective ligands into the backbone of the MOFs. The doping of the defective ligand significantly modifies the structure of the pristine MOFs and exposes abundant catalytic sites, which results in the catalytic performance of MIL‐88A(Fe)‐CA 0.3 surpassing that of MIL‐88A(Fe). Specifically, the overpotential of MIL‐88A(Fe)‐CA 0.3 was 248 mV at 100 mA cm −2 in 1 M KOH solution. This work provides a novel and feasible solution for defective MOFs as catalysts for electrocatalytic water splitting.