Photoelectrocatalytic reduction CO2 can solve energy shortages and environmental problems. However,the poor solubility and intense competition of the hydrogen evolution reaction (HER) seriously restrictCO2 activation. Here, a hydrophilic–hydrophobic Cu-SnO2/ZIF-8 composite catalyst was constructed bycompounding hydrophobic ZIF-8 with hydrophilic Cu-SnO2. Gas-phase CO2 was directly used toimprove the activation efficiency of CO2 molecules, and hydrogen evolution was inhibited. Resultsshowed that when the overpotential was as low as ~364 mV, the Faraday efficiency of formic acidreached 68.96%. The maximum current density approached 12.8 mA·cm-2 at -1.4V versus the Ag/AgClelectrode. The ZIF-8 unique structure promoted electron transfer and Cu-SnO2 dispersion to provideadditional active sites. The excellent photocatalytic performance of Cu-SnO2/ZIF-8 may be attributed tothe special hydrophilic–hydrophobic structure and the small band gap that can absorb much visible light.
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