Nanoporous Fe and Co Dually Doped Carbon Nanotube-Based Oxygen Electrocatalysts for Efficient Zinc–Air Batteries
Chaoyang Liu, Shang Wu, Shuo Tian, Jincai Yang, Jiankun Li, Xin Wang, Lihong Wang, Chen Chen, Ping Zhang, Quanlu Yang
Abstract
The development of bifunctional electrocatalysts to overcome the slow kinetics of the oxygen reduction–evolution reaction (ORR/OER) remains a significant challenge. Therefore, combined with morphology control engineering and bimetallic doping strategies, Fe and Co bimetals are effectively doped into carbon nanotube-coated three-dimensional porous materials, and a cost-effective bifunctional oxygen-electrode material is successfully prepared. The synthesized Fe 25 –NZ8@Co 500 -CN catalysts show high electrocatalytic activity in both ORR ( E 1/2 = 0.85 V) and OER (η j=10 = 350 mV). Furthermore, the zinc-air battery is assembled with the Fe 25 –NZ8@Co 500 -CN catalyst as the air electrode, which has an excellent power density of 183.65 mW cm –2, a specific capacity of 699.2 mA h g Zn –1, and a long-term stability of 200 h. This newly synthesized bimetallic-doped catalyst offers a design option for oxygen electrocatalysts in zinc–air batteries.