Abstract: The present invention relates to the use of a composition of formula (I): Fe9-a-b-cNiaCobMcS8-dSed, wherein M stands for one or more elements having in the ionic state an effective ionic radius in the range of 70-92 pm, a is a number within the range of 2.5?a?3.5, more preferably 2.7?a?3.3, b is a number within the range of 1.5?b?5.0, more preferably 1.5?b?4.0, most preferably 2.5?b?3.5, c is a number within the range of 0.0?c?2.0, more preferably 0.0?c?1.0, d is a number within the range of 0.0?d?4.0, more preferably 0.0?d?1.0, wherein the sum of a, b and c is in the range of 5?a+b+c?8 and wherein ?90 wt. % of the composition is in the pentlandite phase for electrocatalytic splitting of water, preferably for hydrogen evolution reaction.

Abstract: Fiber for tribological applications, with the exception of mineral fibers, comprising at least one solid lubricant, with the exception of graphite, or boated with at least one solid lubricant, with the exception of graphite.