Photoinduced H2 Release In article 2300414, Masahiro Miyauchi, Takahiro Kondo, and co-workers confirmed hydrogen boride (HB) sheets with a B/H atomic ratio of 1.0, freestanding 2D hydrogenated-borophene (borophane) polymorph, to contain three-center–two-electron B–H–B bonds two-center–two-electron terminal B–H bonds. Increasing the BHB/BH bond HB enhances luminescence intensity, whereas reducin...