Low selectivity and the competing reaction of hydrogen evolution are two problems in photocatalytic CO2 reduction. Herein, we deposited highly crystalline metallic Cu nanoparticles onto TiO2 photocatalysts using a solvothermal method. They were found to convert CO2 into CO without any by-products. Importantly, hydrogen evolution can be suppressed after a reaction time of 1-2 h with a high generation rate and selectivity for CO production.
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