Preparation of layered double hydroxide NiCoFeCe catalyst and study on its oxygen evolution performance

In the field of electrocatalysis, layered double hydroxides (LDH) materials have attracted much attention due to their unique layered structure and abundant active sites, demonstrating excellent electrocatalytic activity in promoting the oxygen evolution reaction. In recent years, cobalt-based LDHs have been considered as very promising candidates, but these materials still face key issues such as low conductivity and poor catalytic activity, making it difficult for them to become qualified substitutes for commercial noble metal catalysts. Therefore, through rational design and development of more efficient and stable cobalt-based layered double hydroxide-based materials, it is of great significance for promoting their practical application in the field of electrocatalysis. This paper uses ZIF-67 as the precursor and introduces Ni, Fe, and Ce ions through ion exchange to generate nanosheet-like NiCoFeCe-LDH catalysts. In a 1.0 M KOH electrolyte, this catalyst exhibits excellent OER performance, with a significantly reduced overpotential under a specific current density of 240 mV at 10 mA/cm². Experimental results show that the introduction of Ce significantly enhances the OER activity of the catalyst, providing a new theoretical perspective and practical basis for the study of optimizing the electrocatalytic performance of MOFs materials by doping rare earth metals.