The cell assembly were performed using carbon-ITO as cathode and, fourth types of anodes: (1) ITO-TiO2 commercial particles, (2) ITO-TiO2 thin film, (3) ITO-TiO2+SWCNT (functionalized single wall carbon nanotubes), (4) ITO- TiO2+ MWCNT (functionalized multi wall carbon nanotube), as anode
respectively.