Rationally activated Prussian blue analogue hollow spheres via Pt, Co, and S multi-doping engineering for enhanced Zn-air battery performance

The synergy of appropriate geometrical structure design, the intrinsic properties of individual components, and multi-heteroatom doping engineering is greatly beneficial for improving the electrocatalytic activity of nanomaterials, thereby enhancing the performance of energy storage technologies. Herein, a highly efficient electrode material comprising KMnFe(CN) 6 Prussian blue analogue hollow spheres activated by Pt, Co, and S multi-dopants for boosting next-generation Zn-air batteries is reported. Benefiting from the promising intrinsic property, morphological features and multi-doping effect, the material exhibits exceptional electrochemical performance for the two half-reactions at the air cathode of Zn-air batteries, including the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). As expected, the assembled Zn-air batteries employing the proposed material as the cathode material demonstrate outstanding performance, achieving a high open-circuit potential of 1.40 V, a high power density of 188.7 mW cm −2 , and excellent rechargeability for 72 h of consecutive operation, comparable to state-of-the-art electrode materials containing Pt/C and RuO₂.