Highly Active Electrocatalyst For Rechargeable Zn-Air Battery: 3d Fe/N-Based Honeycomb-Like Carbon

Remarkable bifunctional electrocatalysts for oxygen reaction reduction (ORR) and oxygen evolution reaction (OER) are the key for rechargeable metal-air batteries. In this work, a novel 3D Fe/N-based honeycomb-like carbon with uniformly-distributed active centers were synthesized by agarose and FeCl3 as the precursor, which display excellent ORR performance with large diffusion-limited current density (?7.5 mA cm-2) and Tafel slope (?88 mV/dev), significantly superior to the commercial Pt/C electrode. In addition, Fe-NPC-1000 as cathode catalyst in Zn-air battery owns higher power density and charge-discharge stability in comparison with commercial Pt/C catalyst, which shows excellent potential in the realistic application of energy devices.