ABSTRACT
Photocatalytic CO2 reduction and H2 production are a competitive reaction, and existing active sites cannot take into account the simultaneous gas-solid and liquid-solid reaction processes. Hence, a metallic aerogel (CuAg2.5) with dual active sites was constructed via straightforward in-situ reduction process. CuAg2.5 aerosol has larger porosity and CO2 adsorption capacity, which enables H2O and CO2 to fully contact it. The CuAg2.5 can also construct the cooperative dual active sites, which can conduct CO2 reduction reaction on Ag surface and proton reduction reaction on Cu surface, respectively, thereby efficiently guiding the rapid migration of photogenerated carriers. The yields of CO (18533 µmol g-1) and H2 (20340 µmol g-1) for CuAg2.5 are much higher than those of single metals. The ratio of CO and H2 can also regulated via changing the ratio of Ag and Cu. This work gives new insights into the fabrication of unique high-efficiency plasmonic photocatalysts.
