Foam-likePorous Structured Trimetal ElectrocatalystsExhibiting Superior Performance for Overall Water Splitting and Solid–LiquidZinc–Air Batteries

Electrocatalysts through an interconnected porous structure that are highly durable, active, and affordable for industrial scale production are necessary for electricity conversion and storage devices with superior effectiveness. In the present study, we synthesized free-standing tri-metal oxide (FeNiCoO₄) on top of an incredibly interconnected foam-like porous structure (FNCO) via a simple method. The enhanced FNCO-600 showed remarkable electrocatalytic activity and outstanding stability to the related half-cell responses with regard to oxygen reduction reaction (ORR = 0.757 V), oxygen evolution reaction (OER = 230 mV), and hydrogen evolution reaction (HER = 211 mV). Additionally, we looked into the overall efficiency of water splitting using the FNCO-600 catalyst, which exhibited exceptional longevity (70 h) and an impressive cell voltage (1.72 V). Furthermore, using FNCO-600 as the cathode, we created rechargeable solid–liquid electrolyte-based Zn–air batteries that demonstrated enhanced power densities of 21.8 mW cm^–2 and 167.4 mW cm^–2 with noteworthy durability. Finally, we showed how to synthesize and produce free-standing, foam-like porous structure catalysts on an industrial scale that provide excellent energy storage and conversion.