Description:
Ni 3 S 2 -embedded NiFe LDH heterostructured porous nanosheets were in situ grown on nickel foam (Ni 3 S 2 -NiFe LDHs /NF) via a one-pot solution method mediated by NaHS at room temperature in 15 min. Benefiting from the abundant Ni 3 S 2 -NiFe LDH interfaces, the as-prepared catalyst delivers 50, 500 and 1000 mA cm −2 with an overpotential of only 230, 285 and 303 mV for oxygen evolution reaction, respectively, registering as one of the best performing non-precious metal OER catalysts. In situ and ex situ analysis reveal that the Ni 3 S 2 was in situ partially transformed under electrooxidation environment into NiOOH over an equally important electrically conductive Ni 3 S 2 to drive proficient catalysis. This strategy can be extended to fabricate Ru-Ni 3 S 2 -NiFe LDHs/NF electrocatalyst for high active hydrogen evolution reaction. Coupling these two catalysts achieved remarkable current densities of 10, 100 and 500 mA cm −2 at low voltages of 1.47, 1.71 and 1.85 V upon driving overall water splitting, respectively, superior to the performance of current industrial catalysts (200-400 mA cm −2 at 1.8-2.40 V)