CoTe₂@MoS₂ heterojunction nanorods as efficient cathode catalysts for high-performance lithium-oxygen batteries

Despite their ultrahigh theoretical energy density, lithium-oxygen (Li-O₂) batteries are limited by sluggish reaction kinetics and poor cycling stability. Herein, CoTe₂@MoS₂ core-shell heterojunction nanorods are developed as efficient bifunctional cathode catalysts. The heterointerfaces simultaneously accelerate interfacial charge transfer and promote highly selective Li₂O₂ electrochemistry, as confirmed by in situ DEMS and ex situ measurements. As a result, the cathodes exhibit small voltage gaps, superior reversible specific capacities, satisfactory rate capability, and long cycle life.