NiFe LDH Anchoring on Fe/N-Doped Carbon Nanofibers as a Bifunctional Electrocatalyst for Rechargeable Zinc–Air Batteries
Dan Wu, Xiaolin Hu, Zuguang Yang, Tongxin Yang, Jie Wen, Guanjie Lu, Qiannan Zhao, Zongyang Li, Xiaoping Jiang, Chaohe Xu
Abstract
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 kgZn–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.