Photolysis experiments using 4 wt. % Pt were repeated for three different batches of TBAPα and showed good reproducibility between batches (SI Figure ). The PXRD patterns and sorption isotherms of the three batches were also very similar (SI Figures ) with BET surface areas of 2001, 2270 and 2074 m 2 g -1 . Likewise, static light scattering showed only modest variations in the particle size distribution between batches (average diameters of 9.25-15.52 µm, SI Figure and Table ).