.png){kind=icon}
.png){kind=icon}
Return
Coupling ultrastable Co-Co7Fe3 bifunctional heterostructures on N-doped carbon for rechargeable Zn-air batteries
.png){kind=icon}
PRE
AI
Q
J
Z
Q
L
DOI：10.1016/j.synthmet.2026.118150.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Developing highly active and durable bifunctional oxygen electrocatalysts is critical for advancing metal-air batteries but remains a significant challenge. Herein, we report a novel and efficient strategy for synthesizing a superior bifunctional catalyst via ion-exchange tuning of a Metal-organic framework (MOF) precursor. A rhombohedral Co-based MOF was first synthesized and then subjected to controlled ion-exchange with Fe to obtain bimetallic CoxFey-MOFs with adjustable compositions. Subsequent pyrolysis yielded Co-Co7Fe3 nano-particles embedded within a nitrogen-doped carbon matrix (Co-Co7Fe3@NC). The optimal catalyst (Co-Co7Fe3@NC-M) features a unique heterojunction between metallic Co and Co7Fe3 alloy, coupled with a highly graphitic N-doped carbon framework. This synergistic structure confers exceptional electrocatalytic activity for both the oxygen reduction (ORR) and oxygen evolution reaction (OER), achieving a remarkably low potential gap (Delta E) of 0.641 V, which ranks among the best reported values. When employed as an air cathode in rechargeable zinc-air batteries (ZABs), the catalyst enables outstanding performance: a 1.50 V open-circuit potential, a 878 mAh/g specific capacity, and a 334 mW/cm2 power density, and exceptional long-term stability over 160 h of cycling. This work provides a new paradigm: ion-exchange-mediated MOF transformation for the rational design of high-performance, non-precious metal bifunctional electrocatalysts for next-generation energy conversion and storage devices.
Keywords:
Zn-air battery
Heterostructure
Bifunctional electrocatalyst
Nanoparticle
Durability
Journal
IF:
4.6
Papers:
1.4W
Citations:
1.3W
Organization
Cited Papers