Ni3S2/ZrCoFe-LDH@NF heterojunction catalysts for efficient Overall water Splitting

Abstract With the continuous depletion of traditional energy sources, the development of sustainable energy sources has become one of the important tasks today. A two-step synthesis method was employed to construct Ni 3 S 2 /ZrCoFe-LDH@NF heterostructured electrocatalysts on nickel grid (NF) in situ. X-ray diffractometer, scanning electron microscope, transmission electron microscope and X-ray electron spectroscopy were employed to characterize the Ni 3 S 2 /ZrCoFe-LDH@NF heterostructure, and the HER, OER and total hydrolysis properties of this electrocatalyst were tested in 1 mol·L − 1 KOH electrolyte. It was shown that Ni 3 S 2 /ZrCoFe-LDH@NF was a lamellar stacked heterostructure with an overpotential of 330 mV and a Tafel slope of 90.9 mV·dec − 1 at a current density of 100 mA·cm − 2 in the OER reaction and 159.2 mV at a current density of 10 mA·cm − 2 in the OER reaction. Tafel slope was 96 mV·dec − 1 , and the catalyst exhibited good structural stability in the 100 h total hydrolysis stability test. The successful construction of this heterostructured electrocatalyst provides a good idea and research basis for the subsequent heterojunction and its application in electrocatalysis.