Two-dimensional molybdenum carbide (MXene) as an efficient nanoadditive for achieving superlubricity under ultrahigh pressure

Abstract In this study, a robust macroscale liquid superlubricity with coefficient of friction 0.004 was achieved by introducing molybdenum carbide (Mo 2 CT x ) MXene nanoparticles as lubricating additives in lithium hexafluorophosphate-based ionic at Si 3 N 4 —sapphire interfaces. The maximal contact pressure the state could reach 1.42 GPa, which far exceeds limit regime previous studies. results indicate that composite tribofilm (mainly containing oxide and phosphorus oxide) formed interface tribochemical reaction contributed to excellent antiwear performance. Furthermore, extremely low shear strength interlayers Mo superlubricity. This work demonstrates promising potential improving properties, accelerate application mechanical systems.