A new heterojunction of Ti₃C₂/g-C₃N₄with rich Ti³⁺and pyri-N species can efficiently photoelectrocatalytically convert CO₂into hydrocarbons.

Sustained wear damages on the sliding surfaces of alloys are generally the culprit responsible for the failure of various mechanical systems. Inspired by high-entropy effects, here we deliberately deploy nanohierarchical architecture with composition undulation in a Ni ₅₀ (AlNbTiV) ₅₀ complex concentrated alloy, which yields ultralow wear rate within the order of 10 ⁻⁷ to 10 ⁻⁶ mm ³ /Nm between room temperature and 800 °C. Such remarkable wear resistance heretofore represents one of the highest wear resistance reported for the bulk alloys or composites, and originates from the multi-type adaptive friction interface protection governed by intrinsically nano-coupled grains and nanoprecipitates. This cooperative heterostructure releases gradient frictional stress in stages upon wear at room temperature through the coexistence of multiple deformation pathways while activating a dense nanocrystalline glaze layer upon wear at 800 °C to minimize adhesive and oxidative wear. Our work uncovers a practical avenue for tailoring wear properties with multicomponent heterostructures over a wide temperature range.