A photoelectric conversion was effectively performed by the photocatalytic decomposition of cellulose film on porous titania electrodes prepared from titania paste containing polyethylene glycol. The cellulose film, deposited from an ionic liquid dispersion, increased the short circuit current density in the titania electrodes because it was oxidized by a photocatalytic reaction at their interface. The polyethylene glycol increased the porosity and surface roughness of the titania film, which enhanced the effective contact area, due to its decomposition during heating.