Figure 2.

Cluster immobilization. (a) Digital photographs of the xMo₃/TiO₂ samples with 0.1, 2, 5, and 7 wt % cluster loadings, (b) difference DRS spectra of the Mo₃/TiO₂ composites with different cluster loadings (0.1–20 wt %) subtracted from TiO₂ absorption (see details in Supporting Information, methods) along with the DRS spectrum of Na₂[Mo₃S₁₃] (dashed line), (c) real vs intended loading plot depicting the range of theoretical monolayer capacity (see details in Supporting Information, Section 6), a linear increase between the real and intended loadings for loadings <9 wt % and its saturation at higher loadings. (d) XRD pattern of Mo₃/TiO₂ composites (10 wt % loading) and of a physical mixture of Na₂[Mo₃S₁₃] and TiO₂ (1:9 wt %), (e) EDS-derived elemental mappings of Ti (ii), Mo (iii), and S (iv) in an exemplary 3Mo₃/TiO₂ composite.