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

Abstract

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 Ni3S2/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 Ni3S2/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 Ni3S2/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.