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Abstract Despite the significant progress in Zn−air batteries (ZABs), their widespread use in the rechargeable sector is hindered due to the scarcity of efficient bifunctional oxygen catalysts that can catalyze both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). To address this, an ORR/OER bifunctional electrocatalyst is designed with ultrafine alloyed FeNi nanoparticles encapsulated in a 3D interconnected N‐ doped carbon network structure, featuring a carbon nitride backbone enclosed in graphitic carbon. The FeNi electrocatalyst (3DFeNiPDC) showed good bifunctional activity toward both ORR and OER in the basic medium with a low overpotential value of 30 mV for ORR and 6 mV for OER compared to its state‐of‐the‐art counterparts Pt/C, and RuO 2 , respectively. Utilizing 3DFeNiPDC in a rechargeable Zn‐air battery (RZAB) yields an open circuit voltage (OCV) of 1.35 V, a maximum power density of 232 mW cm −2 , and an energy density of 707 W h kg −1 . Additionally, a flexible RZAB employing 3DFeNiPDC demonstrates an OCV of 1.4 V with various bending angles. These finding suggest 3DFeNiPDC as a viable alternative to noble metal‐based RZABs, offering superior bifunctional electrocatalytic activity and stability, particularly with its enhanced air‐breathing properties facilitating improved operability under practical conditions.
Pandikassala et al. (Sat,) studied this question.