Hydrangea-like NiCo2S4 hollow microspheres as an advanced bifunctional electrocatalyst for aqueous metal/air batteries

Hydrangea-like NiCo2S4 hollow microspheres are proposed as an advanced electrocatalyst for both oxygen reduction and evolution reactions. The NiCo2S4 loaded air electrode exhibits a nice discharge performance in an aluminium/air battery. Likewise, application in a rechargeable zinc/air battery reveals superior discharge voltage and significantly low charge voltage over 60 cycles.