New insights into HER catalysis: The effect of nano-silica support on catalysis by silver nanoparticles
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1The Center for Radical Reactions and the Schlesinger Family Center for Compact Accelerators, Radiation Sources and Applications, Ariel University, Ariel, Israel
2Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel
3Department of Chemistry, Nuclear Research Centre Negev, Beer-Sheva, Israel
2Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel
3Department of Chemistry, Nuclear Research Centre Negev, Beer-Sheva, Israel
Supported metal catalysts have recently attracted considerable attention in the field of catalysis. The effect of pH on SiO2-Ag0-NPs along with the average negative charge induced by (CH3)2COH• radicals on the catalytic reduction of H2O/H3O+ towards HER is reported. The results indicate that similar effects are observed both above and below the point of zero charge (PZC) of silica. More importantly, it was shown that a high concentration of this catalyst does not necessarily contribute to boosting the hydrogen formation, but instead, the density of charge on its surface is a decisive factor. A plausible mechanistic explanation of the observed effect is given.
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