Preparation of the NiFe2O4 electrochemical film for the solid-state reference electrode based on EB-PVD

► The novel preparation technique, i.e., EB-PVD, has been successfully applied to prepare the Ni-Fe binary alloy film. ► The optimal heat-treatment and post-oxidation processes have been established to obtain the key material, i.e., NiFe2O4 film, for the solid-state reference electrode. ► The investigation has laid a solid way to realize the mass, large-scale, integrated, and low-cost production of the NiFe2O4 electrochemical functional films.