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Nickel-iron layered double hydroxide (NiFe LDH) platelets with highmorphological regularity and sub-micrometre lateral dimensions were synthesizedusing a homogeneous precipitation technique for highly efficient catalysis ofthe oxygen evolution reaction (OER). Considering edge sites are the point ofactivity, efforts were made to control platelet size within the synthesizeddispersions. The goal is to controllably isolate and characterize size-reducedNiFe LDH particles. Synthetic approaches for size control of NiFe LDH plateletshave not been transferable based on published work with other LDH materials andfor that reason, we instead use post-synthetic treatment techniques to improveedge-site density. In the end, size reduced NiFe LDH/single-wall carbonnanotube (SWCNT) composites allowed to further reduce the OER overpotential to237 plus/minus 7 mV ( L = 0.16 plus/minus 0.01 micrometres, 20 wt% SWCNT),which is one of the best values reported to date. This approach as wellimproved the long term activity of the catalyst in operating conditions.

Post-Synthetic Treatment of Nickel-Iron Layered Double Hydroxides for the Optimum Catalysis of the Oxygen Evolution Reaction