Publication date: 15th December 2025
Zn/air batteries (ZABs) have recently gained renewed interest due to the European policy of critical material replacement in technological areas such as energy storage, with the need for cost-effective and lightweight (high power density) energy storage technologies. One of the historical drawbacks of ZABs is the difficulty of recharging, which is intrinsically linked to the necessary oxygen evolution reaction. Hence, bifunctional electrocatalysts allowing for efficient oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are required.
In this context, metal oxides such as perovskites have emerged as promising bifunctional electrocatalysts. Moreover, multication compositions such as A(B1x1B2x2…Bnxn)O3 have shown synergistic effects (so-called “cocktail effect”) leading to improved performances over simple perovskites as bifunctional electrocatalysts.
We synthesized LaCoO3 (Sconf = 0) and medium-entropy La(Co0.6Mn0.1Fe0.1Al0.1Ni0.1)O3 (Sconf = 1.23 R) perovskites by a simple solvent-free mechanochemical synthesis. ORR and OER in basic medium are examined using both catalysts, showing substantially lower overpotentials and higher activity for the multication composition, which also has the benefit of employing less cobalt, which is listed as a critical raw material. Eventually, ZABs are fabricated, demonstrating considerable improvement with the medium-entropy noble-metal-free catalysts and high cycling capabilities with over 400 cycles of operation.[1]
The authors acknowledge funding Grant PID2022-139191OB-C32 funded by MICIU/AEI/10.13039/501100011033 and FEDER, UE. F.P.
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