α-Fe O Nanoparticles Decorated C@MoS Nanosheet Arrays with Expanded Spacing of (002) Plane for Ultrafast and High Li/Na-Ion Storage.

MoS nanosheets as a promising 2D nanomaterial have extensive applications in energy storage and conversion, but their electrochemical performance is still unsatisfactory as an anode for efficient Li /Na storage. In this work, the design and synthesis of vertically grown MoS nanosheet arrays, decorated with graphite carbon and Fe O nanoparticles, on flexible carbon fiber cloth (denoted as Fe O @C@MoS /CFC) is reported. When evaluated as an anode for lithium-ion batteries, the Fe O @C@MoS /CFC electrode manifests an outstanding electrochemical performance with a high discharge capacity of 1541.2 mAh g at 0.1 A g and a good capacity retention of 80.1% at 1.0 A g after 500 cycles. As for sodium-ion batteries, it retains a high reversible capacity of 889.4 mAh g at 0.5 A g over 200 cycles. The superior electrochemical performance mainly results from the unique 3D ordered Fe O @C@MoS array-type nanostructures and the synergistic effect between the C@MoS nanosheet arrays and Fe O nanoparticles. The Fe O nanoparticles act as spacers to steady the structure, and the graphite carbon could be incorporated into MoS nanosheets to improve the conductivity of the whole electrode and strengthen the integration of MoS nanosheets and CFC by the adhesive role, together ensuring high conductivity and mechanical stability.