CoFe₂O₄@N‐CNH as Bifunctional Hybrid Catalysts for Rechargeable Zinc‐Air Batteries

Abstract

Abstract Improving the efficiency of bifunctional electrocatalysts is a decisive challenge in the area of long‐lasting rechargeable zinc‐air batteries. Enhancing the catalysts' performance is crucial for advancing zinc‐air batteries. Transition‐metal oxides have emerged as promising non‐precious, noble‐metal‐free catalysts. Herein, a unique precursor directed approach is introduced for preparing a cobalt ferrite@nitrogen doped carbon nanohorns (CoFe 2 O 4 @N‐CNHs) nanohybrid catalyst in a single step annealing process involving stoichiometric amounts of single‐source cobalt and iron molecular precursors and carbon nanohorns (CNHs) under an argon/ammonia (Ar/NH 3 ) atmosphere. This procedure enables a simultaneous CoFe 2 O 4 ferrite synthesis and nitrogen functionalization of CNHs. The precious metal free nanohybrid CoFe 2 O 4 @N‐CNHs‐30% containing 30% of carbon presents an oxygen reduction reaction (ORR) half wave potential and onset potential comparable to the standard ORR catalyst 20% Pt/C. CoFe 2 O 4 @N‐CNHs‐30% also establishes superior oxygen evolution reaction (OER) performance with a low overpotential and a small Tafel slope than benchmark OER catalyst RuO 2 . Furthermore, the rechargeable zinc‐air battery with the CoFe 2 O 4 @N‐CNHs‐30% nanohybrid as air electrode demonstrates steadier and more durable charge–discharge cycles, and outstanding energy density relative to the state‐of‐the‐art 20% Pt/C‐RuO 2 catalyst.