NiFe LDH Anchoring on Fe/N-Doped Carbon Nanofibers as a Bifunctional Electrocatalyst for Rechargeable Zinc–Air Batteries

This is the authors' abstract. We don't add key points for this paper.

Challenges remain for the preparation of high-performance rechargeable Zinc-air batteries (ZABs). Herein, we propose a bifunctional electrocatalyst (NiFe LDH@Fe-N-CNFs) constructed by NiFe LDH growing on Fe- and N-modified carbon nanofibers. The NiFe LDH@Fe-N-CNFs with a cross-linked network nanostructure possess abundant Fe-N-C reactive locations in Fe/N-codoped carbon nanofibers and ultrathin NiFe LDH nanosheets, which could greatly enhance ORR/OER activities. Importantly, the assembled ZABs triggered by the NiFe LDH@Fe-N-CNFs electrocatalyst exhibits a high capacity of 695.2 mA h g –1 . An energy density of 838.6 Wh kg Zn –1 and an outstanding stability of 184 h at 10 mA cm –2 are demonstrated. The superior performance of NiFe LDH@Fe-N-CNFs bifunctional electrocatalysts benefits from the synergy between Fe/N-modified carbon nanofibers and ultrathin NiFe LDH nanosheets with respective ORR and OER active sites. This work affords a rational design principle and strategy to design the bifunctional electrocatalyst.