||Producing fuels through CO2 recycling, particularly powered by abundant light energy, offers a promising opportunity for a sustainable energy supply. This talk presents the approach of using plasmonic nanoparticles as a new class of photocatalysts for directly producing hydrocarbons in the presence of H2O, CO2, and visible light. Visible-light plasmonic excitation of Au nanoparticles drives CO2 reduction reaction with a promoter, producing higher energy density fuels than C1, e.g., C2+ hydrocarbons that need additional electron and proton transfer as well as C-C bond formation steps. A combined study of experiment and theory shows that the magnitude of chemical potential contributed by plasmonically generated charge carriers plays a key role in the reaction selectivity, which is dependent on the concentration of photon. The findings show that the light attribute serves as a major contributor to controlling reaction pathways in plasmonic photosynthesis.