Abstract
Lithium-oxygen (Li-O2) battery is regarded as one of the potential energy storage system due to the ultra-high theoretical energy density and environmental friendliness. However, the sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) severely limited the discharge/charge efficiency. Herein, the single-atom Ru anchored N-doped reduced graphene oxide nanosheets (Ru-N/rGO) was fabricated via a simple impregnation method. When employed as cathode for Li-O2 battery, the Ru-N/rGO delivers a higher discharge capacity, a lower overpotential and better rate performance in comparison with pure N-rGO without Ru atoms. Based on the in situ DEMS, the e-/O2 ratio of Ru-N/rGO (2.08) is close to the theoretical value for the desired O2 reduction to Li2O2 (2.00), suggesting the discharged product is mainly Li2O2. The density functional theory simulations reveal that the Ru single atoms offer high catalytic activity for OER and ORR. This work gives insight for the application of single atoms in advanced rechargeable Li-O2 batteries.
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