In order to solve the problem of instability of MXene nanosheet structure in electrochemical energy storage processes, inspired by the moireś uperlattice effect of magic angle graphene, a twisted hexagon-Ti 3 AlC 2 precursor was synthesized by an in situ reaction method using the molten pool effect of Lewis acid molten salt. In addition, moirésuperlattice MXene Ti 3 C 2 nanosheets with rotating moirépattern lattice structure were innovatively constructed by the substitution reaction etching of the twisted hexagon-Ti 3 AlC 2 precursor with different ionic Lewis acid salts and microwave-assisted etching. The microstructure evolution of moirésuperlattice Ti 3 C 2 nanosheets was characterized by a simple and intuitive method. The atomic arrangement and the rotating moirépattern were modeled. The formation mechanism and relationship between the rotation angle and rotating moirépattern were also analyzed. This contributes to the enrichment of the moirésuperlattice material family. It is expected to further promote the research progress of MXene nanomaterials in the field of electrochemical energy storage. KEYWORDS: MXene Ti 3 C 2 , moirésuperlattice, twisted hexagon-Ti 3 AlC 2 , microwave-assisted etching, electrochemical energy storage

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