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Phys Chem Chem Phys. 2014 Aug 7;16(29):15422-9. doi: 10.1039/c4cp00941j.

The effect of the nano-silica support on the catalytic reduction of water by gold, silver and platinum nanoparticles--nanocomposite reactivity.

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Department of Biological Chemistry, Ariel University, Ariel, Israel.


Pt°-NPs, prepared by the reduction of Pt(IV) salts with borohydride, do not catalyse the reduction of water in the presence of the strongly-reducing ˙C(CH3)2OH radicals. However, supporting the same metal nanoparticles (M°-NPs) with SiO2 alters the catalytic properties enabling the reaction. This effect depends both on the nature of M° and concentration of the composite nanoparticles. At low nanocomposite concentration: for M = Au nearly no effect is observed; for M = Ag the support decreases the catalytic reduction of water and for M = Pt the support initiates the catalytic process. At high nanocomposite concentration: for M = Au the reactivity is considerably lower and for M = Ag or Pt no catalysis is observed. Furthermore, for M = Ag or Pt H2 reduces the ˙C(CH3)2OH radicals.

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