Notably, the here developed hydrophobized photocatalysts are not only applicable for light-driven H2O2 generation, but can be also utilized for fatty alcohol reforming to molecular hydrogen using platinum as a co-catalyst (Figure ). Interestingly, the hydrophilic Pt-KPHI shows no activity towards H2 evolution if the pH of the aqueous solution is neutral and the hydrogen production for this material was only detected under acidic conditions. This is not the case for the hydrophobic Pt-KPHI-HMDS sample that is capable of photocatalytic H2 evolution both under neutral and acidic conditions in the aqueous phase (Figure ). These results suggest that the hydrophobic nature of KPHI-HMDS is highly beneficial for effective proton management that is expected to play an important role in light-driven H2 evolution in a biphasic system.