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Sylwester Gawinkowski opened a general discussion of the paper by Jorge Salmon-Gamboa: Why you are using SiO 2 nanoparticles? Do they have any function or are they only the substrate to attach other active nanoparticles to? You have shown that only gold nanoparticles attached to silica nanoparticles do not inuence the rate of reaction signicantly. You have also demonstrated that adding platinum decorations on the gold nanoparticles causes a strong increase in the reaction rate. The signicance of the gold nanoparticles would be more clearly shown with a simple experiment in which you have no gold nanoparticles but still have platinum decorations. Jorge Salmon-Gamboa replied: Silica nanoparticles were chosen as a nanosized inert substrate for Au nanoparticles. This choice of substrate provides a larger surface area covered with the active Au-Pt nanoparticles, in contrast to the situation when the active particles are placed directly onto a at substrate. Aiming for applications, the SiO 2-Au-Pt nanoparticles can then in turn be attached onto a at surface, forming a solid device that can be submerged into water, avoiding the problem of water contamination by nanoparticles. The role of the Au nanoparticles was investigated. Under illumination in the LSP spectral band (556-566 nm), SiO 2-Pt did not enhance the reaction rate. In contrast, under the same conditions, SiO 2-Au-Pt showed a considerably enhanced rate, proving that hot carriers were generated in Au (see Fig. 1 below). (601:[601]601) Yuri Diaz Fernandez continued the discussion: I have two questions: (1) Can you comment on the dispersity of the size distribution of metal and SiO 2 particles and how well controlled are these in your system? (2) In the DIS C9FD90014D

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