Rational Design of Nature Molybdenite with La2O3 Catalysts for Improved Energy-Storage Behaviors

Natural molybdenite (MoS 2 ) displays large interlayer distance and rich electrochemical activities, but suffers from the complex preparation process with serious pollution. MoS 2 , as the low-cost resources, have captured numerous attentions as first-hand energy-storage materials. However, they are still limited by the shuttling of polysulfide and side reactions. Through the in situ solution deposition and thermochemical methods, molybdenite@La 2 O 3 is successfully prepared with the formation of Mo  S  La bonds in the interfaces. La 2 O 3 , as the important catalyst, is uniformly distributed on the surface of molybdenite, which serves vital roles in the redox reversibility. Owing to the fascinating architecture, the as-obtained samples deliver a considerable capacity of 803.1 mA h g −1 , with high coulombic efficiency of 86.32%. After 500 cycles, the capacity increases up to ≈ 1200 mA h g −1 . Even at 5.0 A g −1 , its capacity can be remained ≈ 550 mA h g −1 after 100 cycles. Assisted by the detailed kinetic behaviors, the improved energy-storage capability mainly comes from the enhancements of pseudocapacitive behaviors. Moreover, benefiting from the detailed resistance analysis, the existing of La 2 O 3 can induce the evolution of redox reactions stability. Thus, the work is expected to provide effective modified strategy for natural molybdenite in energy-storage systems.