Developing cost-effective and efficient oxygen evolution reaction (OER) electrocatalyst is highly essential for energy-conversion technologies. A self-assembled NiFe-layered double hydroxide (LDH)@MnCO3 heterostructure prepared on Ni foam using a successive hydrothermal strategy shows notable catalytic activity toward the OER with a small overpotential of 275 mV to drive a geometrical current density of 10 mA cm(-2) under alkaline conditions with remarkable stability for 15 h, outperforming IrO2/C electrocatalyst (350 mV@10 mA cm(-2)). The hierarchical NiFe-LDH@MnCO3 heterostructure possess more exposed active sites, enhanced conductivity and superior interfacial coupling effect makes them an ideal candidate for OER electrocatalyst. (C) 2020 Elsevier Inc. All rights reserved.