Exfoliated MoS2@C nanosheets as anode for sodium/potassium storage

Due to high theoretical capacity (670 mA h g −1 ), MoS 2 can become a good application for energy storage. It is reported that the layer spacing of MoS 2 can be exfoliated, which improves Na + /K + insertion/extraction and promotes electron diffusion and ion transport. So, we obtained exfoliated MoS 2 nanosheets with the modification of a carbon layer, in order to form exfoliated MoS 2 @C nanosheets. With the analysis of XRD and TEM, it was found that the larger interlayer spacing was obtained. As the anodes for sodium ion batteries (SIBs), the exfoliated MoS 2 nanosheet electrode showed a high capacity (641 mA h g −1 at 50 mA g −1 ) and maintained a capacity of 214 mA h g −1 at 1000 mA g −1 after 400 cycles. Moreover, it was discussed as anode for potassium ion batteries (KIBs). It can be found that the electrode had 241 mA h g −1 at 100 mA g −1 after 20 cycles.