A dual-atom catalyst based on adjacent iron and nickel sites is reported. The catalyst shows outstanding performance for both ORR and OER, which allows the integration into highperformance rechargeable Zinc air batteries which use the new bifunctional catalyst for both, ORR and OER. Experimental and theoretical analyses rationalize the observed catalytic performance and robustness. Mechanistic studies into the nature of the catalytic site allow initial understanding of the role and synergism of the metal centers as well as the N-doped carbon matrix and the conductive carbon nanotube support structure. The work provides an effective strategy to develop advanced bifunctional catalyst for critical energy conversion and storage processes.