Superlubricity under ultrahigh contact pressure enabled by partially oxidized black phosphorus nanosheets

Abstract Superlubricity has recently raised an increasing interest owing to its great potential in energy saving and environmental benefits. Yet how obtain stable superlubricity under ultrahigh contact pressure (>1 GPa) still remains a challenge. Here, we demonstrate that robust liquid can be realized even of 1193 MPa by lubrication with partially oxidized black phosphorus (oBP) nanosheets. The analysis indicates the oBP nanosheets absorb large amounts water molecules are retained at friction interface transform pairs between Molecular dynamics simulation demonstrates could abundant P=O P–OH bonds formed on nanosheet surfaces, contributing achievement pressure. This work introducing concept diverse industrial applications involving high-contact-pressure operating conditions.