NiFe-LDH@Ni3S2 supported on nickel foam as highly active electrocatalysts for oxygen evolution reaction

Interface engineering is an efficient strategy for synthesis of high efficiency catalysts which can combine the advantages of each part for improving the catalytic activity. Herein, we fabricate the heterostructure NiFe-LDH@Ni3S2 by interface engineering through a simple hydrothermal combined with electrodeposition method. Combining the high conductivity of Ni3S2 and high intrinsic OER activity of NiFe-LDH at the interface, the NiFe-LDH@Ni3S2 electrode exhibits a relatively low overpotential of 240 mV for OER at a current density of 200 mA cm−2 which is lower than NiFe-LDH and Ni3S2. In addition, the overall water splitting unit provides a potential of 1.47 V at 10 mA cm−2. Furthermore, after 24 h of electrolysis in 1.0 M KOH, the current density remains 98% of the original value. This work paves a new way for synthesis of more heterostructure catalysts.