Carbon dioxide (CO2) photoreduction in artificial photosynthesis has a potential to be an effective technology for the energy resource depletion and environmental pollution. The metal complex catalysts required for the reaction, such as Ru-Re complex, have disadvantage of high cost although they enable efficient photoreduction performance. Therefore, a material-based development of an inexpensive catalyst that also holds acceptable efficiency is highly required. In this study, we have examined the potential of zinc phthalocyanine (ZnPc) and its combination with titanium dioxide (TiO2) as the new cathode material. As shown in the figure, ZnPc has porphyrin structure that is similar to the natural chlorophyll observed in plants. Using ZnPc/TiO2, CO2photoreduction in water was evaluated. In addition, performance on generation of formic acid and carbon monoxide (CO) was investigated as well. Experiment was done as follows. ZnPc was immobilized on TiO2 surface in the following steps. First, the ZnPc was dissolved in 15 mL tetrahydrofuran (THF) in advance. Next, titanium dioxide (TiO2) particles were immersed in the prepared solution. Immersion was done in the shaker with slow movement and lasted for about 12 hours. Thereafter, the powder was removed from the suspension and dried by suction filtration. The obtained powder was used as the sample ZnPc / TiO2. Second, the 5% solution volume of triethanolamine (TEA) was mixed in 40 mL water as a sacrificial reagent. Solution was bubbled with CO2 for 30 minutes to make suspended ZnPc/TiO2. The suspended ZnPc/TiO2 was irradiated with visible light for 4 hours. Performance of CO2 photoreduction was evaluated using gas chromatography. Results of CO2photoreduction in 1, 2, 3 and 4 hours after visible light irradiation was compared and discussed. As a result, generation of CO was confirmed using the proposed material. On the other hand, CO was not detected in the system using ZnPc only. This suggests the CO2 photoreduction using ZnPc/TiO2 in water was effective. ZnPc/TiO2 was fabricated and its performance of CO2 photoreduction was evaluated using gas chromatography. As the sacrificial donor, water with triethanolamine (TEA) was used. As a result, carbon oxide (CO) was obtained as the reaction product, and hydrogen gas was obtained as the water decomposition product. As an overall result, surface modification using ZnPc had shown to enhance the CO2 photoreduction ability of the TiO2. Figure 1