Nitrogen-Doped carbon coupled FeNi3 intermetallic compound as advanced bifunctional electrocatalyst for OER, ORR and zn-air batteries

By Ding Chen, Jiawei Zhu, Xueqin Mu, Ruilin Cheng, Wenqiang Li, Suli Liu, Zonghua Pu, Can Lin, Shichun Mu. 2020

309 citations recorded by the source corpus.

Abstract Developing OER&ORR bifunctional electrocatalysts has great significance for promoting the green energy conversion and storage technologies. Herein, nitrogen doped carbon coupled FeNi3 intermetallic compound (FeNi3@NC) is designed and constructed by a super facile route. Rich defects, multiple active centers and strong synergistic effect allow FeNi3@NC with superior OER&ORR performance in alkaline environments. It exhibits an ultralow overpotential (Eover) of 277 mV at 10 mA/cm2 for OER, and a high half-wave potential (E1/2) of 0.86 V for ORR which outperform commercial Pt/C electrocatalysts. As a result, the ΔE (ΔE = Eover,OER – E1/2,ORR) value of 0.65 V largely surpasses Pt/C-IrO2 noble metal benchmarks (ΔE = 0.73 V). Furthermore, density function theory calculations are performed to probe its electrocatalytic mechanism. As expected, the peak power density and energy density of FeNi3@NC based rechargeable Zn-air battery reaches 139 mW/cm2 at 234 mA/cm2 and 915 Wh kg−1 at 10 mA/cm2, respectively, with excellent stability. Our exploration provides a guideline for synthesis of advanced bifunctional electrocatalyst.

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/eb9736887ff7a63fd57fcdfd4e9baf17ef0fca21