Self-assembled 3D hierarchical MnCO3/NiFe layered double hydroxides as a superior electrocatalysts for the oxygen evolution reactions

Abstract

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.