High-Performance Photoelectrocatalytic Reduction Of Co2 By The Hydrophilic-Hydrophobic Composite Cu-Sno2/Zif-8
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE(2021)
Abstract
Photoelectrocatalytic reduction CO2 can solve energy shortages and environmental problems. However, the poor solubility and intense competition of the hydrogen evolution reaction (HER) seriously restrict CO2 activation. Here, a hydrophilic-hydrophobic Cu-SnO2/ZIF-8 composite catalyst was constructed by compounding hydrophobic ZIF-8 with hydrophilic Cu-SnO2. Gas-phase CO2 was directly used to improve the activation efficiency of CO2 molecules, and hydrogen evolution was inhibited. Results showed that when the overpotential was as low as -364 mV, the Faraday efficiency of formic acid reached 68.96%. The maximum current density approached 12.8 mA. cm(-2) at -1.4V versus the Ag/AgCl electrode. The ZIF-8 unique structure promoted electron transfer and Cu-SnO2 dispersion to provide additional active sites. The excellent photocatalytic performance of Cu-SnO2/ZIF-8 may be attributed to the special hydrophilic-hydrophobic structure and the small band gap that can absorb much visible light.
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Key words
Hydrophilic-hydrophobic structure, CO2 reduction, Photoelectrocatalysis, ZIF-8, Sn-based nanoparticles
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