Li‐O2 Batteries: Hierarchical NiCo2S4@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O2 Batteries (Adv. Energy Mater. 24/2019)

In article number 1900788, Zhiwei Zhang, Longwei Yin, and co-workers demonstrate a 3D hierarchical NiCo2S4@NiO heterostructure array on carbon paper for Li-O2 battery cathodes. A built-in interfacial potential between NiCo2S4 and NiO can drastically enhance interfacial charge transfer kinetics. Furthermore, intrinsic LiO2-affinity characteristics of NiCo2S4 and NiO play a synergistic role in constructing a low-impedance Li2O2/cathode contact interface. The resulting hybrids exhibit superior electrocatalytic activity toward both ORR and OER.