Co Single Atom-FeCo Alloy-Carbon Nanotube Catalysts on Graphene for Lithium–Oxygen and Lithium–Carbon Dioxide Batteries
Chen-Ming Tseng, Cheng-Chia Huang, Jing-yu pai, Yuan‐Yao Li
Abstract
Lithium–oxygen (Li–O 2 ) and lithium–carbon dioxide (Li–CO 2 ) batteries are emerging as promising energy storage devices. Bifunctional catalysts play a crucial role in the reduction and evolution reactions for rechargeable Li–O 2 and Li–CO 2 batteries. In this study, we synthesized Co single-atom catalysts (SAC(Co)) and FeCo alloy nanoclusters embedded on nitrogen-doped carbon nanotubes (NCNTs) grown on a reduced graphene oxide (rGO) catalyst (SAC(Co)-FeCo-NCNT/rGO) for use in Li–O 2 and Li–CO 2 applications. We found that the SAC(Co), FeCo, and NCNTs offer excellent electrocatalytic performance due to their synergistic effect, while the open-space structure of the NCNTs and rGO provides a large void for the storage of discharge products (Li 2 O 2 and Li 2 CO 3 ). As a result, the Li–O 2 battery with the novel bifunctional catalyst showed a deep discharge capacity of 29498 mAh g –1 (at 200 mA g –1 ) and a good cycle ability (>100 cycles at 500 mAh g –1 and 200 mA g –1 ), while the Li–CO 2 battery exhibited a deep discharge capacity of 43463 mAh g –1 (at 200 mA g –1 ) and good cycle ability (>200 cycles at 500 mAh g –1 and 500 mA g –1 ).