Electrocatalytic reduction of CO2 with enhanced C2 liquid products activity by the synergistic effect of Cu single atoms and oxygen vacancies
Electrochemical conversion of CO2 to high energy density multi-carbon liquid phase fuels such as ethanol offers a promising strategy to realize carbon neutrality.However,the selectivity of val-ue-added C2 liquid products is still deemed unsatisfactory currently due to the high overpotential,poor selectivity,and the difficulty of the C-C coupling process.Herein,we report that Cu single at-oms(SAs)on hydrogen reduced UIO66-NH2(named Cu SAs/UIO-H2)achieve C2 liquid products Faraday efficiency(FE)of 58.62％and ethanol FE of 46.28％at a low potential of-0.66 V versus the reversible hydrogen electrode.The ethanol FE of Cu SAs/UIO-H2 is 9.61 times higher than UIO66-NH2.Moreover,the experimental results and theoretical calculations demonstrate that Cu SAs and oxygen vacancies(OVs)synergistically promote the generation of*HCCOH intermediate,thus accelerating the formation of ethanol.This work offers deeper understanding at the atomic scale for designing high-performance electrocatalysts for CO2 conversion to valuable liquid fuels.
Cu single atoms catalystOxygen vacanciesElectrocatalysisCO2 conversionEthanol synthesis
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