Bimetallic cocatalysts have played an important role in increasing the catalytic activities of various metal oxide supports. Herein, Cu and Ni cocatalysts were loaded onto TiO 2 nanoparticles and tested for both thermal CO oxidation and photocatalytic CO 2 reduction activities. It was observed that the thermal CO oxidation onset started to appear at approximately 200 °C. Photocatalytic CO 2 reduction products were commonly found to be CO, CH 4 , and CH 3 OH, with total yields of 14.7, 3.2, and 6.1 μmol after 13 h of UVC irradiation, respectively. The 5 mol% Cu/Ni-loaded sample showed the highest thermal CO oxidation activity, whereas the 1 mol% Cu/Ni-loaded sample showed the highest CO 2 reduction activity. The demonstration experiments for CO oxidation and CO 2 reduction could provide valuable information for developing efficient catalysts for sustainable energy and environmental solutions.
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