Cell + Ionic relaxation with Orb v3 conservative inf MPA; 0.03 eV/Å threshold; final energy = -47.3631 eV; energy change = -0.1889 eV; symmetry: P6_3/mmc → P6_3/mmc
2H-phase WS2 crystal structure for Cycle 20 TMD HER catalyst analysis. Space group P6_3/mmc (#194), a=3.153, c=12.323. Built from experimental lattice parameters.
Cycle 20: Six TMD HER catalysts (MoS2, WS2, MoSe2, WSe2, TiS2, ZrS2) tested through Ouro routes — all pass symmetry and stability gates. Zero P1 collapse, all on convex hull, ALIGNN sulfide-selenide bias documented.