The role of Ag deposits is only to attract photogenerated electrons. In principle facilitates the separation of photogenerated charge carriers. Electrons can be transferred from TiO2 to Ag particles because of the difference in work function of two materials. Approximately 4.7eV for Ag vs 4.6 eV for TiO2 The importance of transfer depends on the size and distribution of metal particles on semiconductor. Ag possess good catalytic properties for the reduction of oxygen and also to the formation of superoxide ion radicals on Ag with lower voltage than on TiO2 The detrimental effect of Ag...