Room-Temperature Interfacial Approach Towards Iron/Nitrogen co-Doped Fibrous Porous Carbons as Electrocatalysts for Oxygen Reduction Reaction and Zn-Air Batteries
Development of nonprecious and efficient catalysts to boost oxygen reduction reaction (ORR) is the key to realize various sustainable storage devices with high energy capacity, such as fuel cells and metal-air batteries. However, the majority of previous reported approaches suffered from complicated fabrication procedure, time consuming and difficult to scale up. Herein, large-scale iron ion embedded polyaniline fibers were successfully fabricated as precursors for preparing iron/nitrogen co-doped fibrous porous carbons (Fe/NPCFs) through an interfacial engineering strategy at room temperature. As ORR electrocatalysts in alkaline medium (0.1 M KOH), Fe/NPCFs display a positive half-wave potential of 0.827 V (vs RHE), and high limited current density (up to 5.76 mA cm−2), which are better than those of commercial Pt/C (E1/2=0.815 V, JL=5.47 mA cm−2). Also, Fe/NPCFs exhibit the high ORR catalysis activity (E1/2=0.632 V, JL=5.07 mA cm−2) in acidic medium (0.5 M H2SO4). When used as air cathode in a primary Zn-air battery, high power density (158.5 mW cm−2) and specific capacity (717.8 mAh g−1) can be easily achieved, outperforming the commercial Pt/C.
- This article is part of the themed collection: Nanocarbons