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MXenes are a rapidly growing family of 2D materials that exhibit a highlyversatile structure and composition, allowing for significant tuning of thematerial properties. These properties are, however, ultimately limited by thesurface terminations, which are typically a mixture of species, including F andO that are inherent to the MXene processing. Other and robust terminations arelacking. Here, we apply high-resolution scanning transmission electronmicroscopy (STEM), corresponding image simulations and first-principlescalculations to investigate the surface terminations on MXenes synthesized fromMAX phases through Lewis acidic melts. The results show that atomic Clterminates the synthesized MXenes, with mere residual presence of othertermination species. Furthermore, in situ STEM-electron energy lossspectroscopy (EELS) heating experiments show that the Cl terminations arestable up to 750 {\deg}C. Thus, we present an attractive new termination thatwidely expands the MXenes functionalization space and enable new applications.

Tin+1Cn MXene with fully saturated and thermally stable Cl terminations