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.