Fabrication of defect-rich MoS 2 ultrathin nanosheets for application in lithium-ion batteries and supercapacitors

Defect-rich MoS 2 ultrathin nanosheets with abundant unsaturated sulfur atoms are constructed using a stoichiometric ratio of Mo( vi ) and l -cysteine in the presence of 1,6-hexanediamine. The as-prepared MoS 2 ultrathin nanosheets exhibit excellent electrochemical activities in lithium-ion batteries and supercapacitors with a high reversible capacity and good cycling stability. The construction of defects with abundant unsaturated sulfur atoms in the MoS 2 ultrathin nanosheets provided active sites for improving the electrochemical performance in lithium-ion batteries and supercapacitors. This work provides an accessible foundation for engineering more sophisticated defect-rich MoS 2 ultrathin nanosheet-based composites for further optimization across a range of possible domains of application.