Fig. 8From: Enhanced Photoelectrochemical Activity of ZnO-Coated TiO2 Nanotubes and Its Dependence on ZnO Coating ThicknessCyclic voltammograms of bare TiO2 NTs, 10-cycle ZnO/TiO2 NTs, and 25-cycle ZnO/TiO2 NTs in a 0.5 M Na2SO4 solution at a scan rate of 50 mV/sBack to article page