Search

The CO2photoconversion is sensitive to the local reaction environment, of which activity and selectivity can be regulated by the change of reaction systems. This paper focuses on investigating the photocatalytic CO2reduction behaviors of MOFs with the involvement of water under different reaction modes, including gas-solid and liquid-solid systems. The CO2photoreduction in a liquid-solid system shows high performance in generating HCOOH with the selectivity of 100%. In contrast, the gas-solid system referring to the synergistic interaction of MOFs and H2O vapor benefits to the formation of gas-phase products, such as CO and CH4. The possible mechanisms of photocatalytic CO2reaction in two modes were investigated by in-situFourier-transform infrared spectroscopy, which indicates that the distinction in reaction consequence may result from the difference in CO2chemisorbed modes and the proton provision. The choice of reaction system plays an important role in the achievement of high efficiency and selectivity for photocatalytic CO2reduction, which is of great practical value in real-world applications.