It is essential to design an oxygen evolution reaction (OER) electrocatalyst with smaller overpotential to improve water electrolyzer efficiency. Here, we report a simple method to incorporate nickel hexacyanoferrate into the three-dimensional (3D) graphene aerogel (GA) structure (NiHCF/GA), through which we have derived OER active FeNi-P/GA catalyst by heating with the phosphide source. Structural characterization data disclosed that the NiHCF derived FeNi-P particles were uniformly distributed in the 3D GA network. The obtained FeNi-P/GA catalyst exhibits precursor ([K3Fe(CN)(6)] and NiCl2) concentration-dependent electrocatalytic activity towards OER. Linear sweep voltammetry (LSV) study shows OER on the optimized FeNi-P/GA catalyst surface commenced at 1.46 V vs. RHE and demands only 280 mV overpotential to achieve the benchmark current density of 10 mA.cm(-2). Also, the FeNi-P/GA catalyst displayed a Tafel slope of 43 mV.dec(-1), suggesting its superior OER performance in alkaline condition. (C) 2018 Elsevier Ltd. All rights reserved.