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In the present investigation,a new composite nanostructured photoanodes were prepared using TiO_2 nanotubes(TNTs) with TiO_2 nanoparticles(TNPs).TNPs were synthesized by sol-gel method,and TNTs were prepared through alkali hydrothermal method.Dye-sensitized solar cells(DSSCs) were fabricated with different photoanodes comprising of various ratios of TNTs + TNPs,synthetic indigo dye as photosensitizer,PMII(l-propyl-3-methylimidazolium iodide) as ionic liquid electrolyte and cobalt sulfide as counter electrode.The structures and morphologies of TNPs and TNTs were analyzed through X-ray diffractometer,transmission electron microscope and scanning electron microscopes.The results of the investigation showed that the DSSC-4 made with composite photoanode structure(TNTs/TNPs)(90% of TNPs + 10% of TNTs) had improved photocurrent efficiency(2.11%) than pure TNPs(1.00%) and TNT film(0.78%).Electrochemical impedance spectra revealed that the composite TNTs/TNPs film-based DSSCs possessed the lowest charge-transfer resistances and longest electron lifetime.Hence,it could be concluded that the composite TNTs/TNPs photoanode facilitates the charge transport rate and enhances the efficiencies of DSSCs.
In the present investigation, a new composite nanostructured photoanodes were prepared using TiO_2 nanotubes (TNTs) with TiO_2 nanoparticles (TNPs) .TNPs were synthesized by sol-gel method, and TNTs were prepared through alkali hydrothermal method. Dye-sensitized solar cells ) were were fabricated with different photoanodes including various ratios of TNTs + TNPs, synthetic indigo dye as photosensitizer, PMII (l-propyl-3-methylimidazolium iodide) as ionic liquid electrolyte and cobalt sulfide as counter electrode. The structures and morphologies of TNPs and TNTs were analyzed through X-ray diffractometer, transmission electron microscope and scanning electron microscopes. The results of the investigation showed that the DSSC-4 made with composite photoanode structure (TNTs / TNPs) (90% of TNPs + 10% of TNTs) had Improved photocurrent efficiency (2.11%) than pure TNPs (1.00%) and TNT film (0.78%). Electrochemical impedance spectra revealed that the composite TNTs / TNPs film-based DSSCs possessed the low est charge-transfer resistances and longest electron lifetime .ence, it could be that that composite TNTs / TNPs photoanode facilitates the charge transport rate and enhances the efficiencies of DSSCs.