Optimizing Copper Oxidation State to Promote Ethylene Generation in Efficient Carbon Dioxide Conversion
2022
Yang, Fan | Fang, Wensheng | Wang, Qingyong | Deng, PeiLin | Xia, Bao Yu
The electrochemical reduction of carbon dioxide (CO₂) to valuable carbon-based fuels and chemicals has attracted extensive attention. In this work, different copper catalysts have been prepared to explore the roles of different oxidation states on the activity and selectivity of CO₂ reduction. The optimal oxidation state of copper catalyst provides 53% Faradaic efficiency (FE) for converting CO₂ to ethylene and achieves a maximum FE of 74% for C2 hydrocarbons (ethylene and ethanol) at −1.3 V vs reversible hydrogen electrode (RHE). Moreover, characterization and electrochemical results show that with the decrease of oxidation state of copper catalysts, methane is mainly inhibited, while ethylene dominates in a wide potential window. This work provides reliable experimental evidence and valuable insights in adjusting the oxidation state of copper catalysts to achieve high selectivity of hydrocarbon products, which may provide important guidance for the design and preparation of efficient catalysts for selective CO₂ electroreduction to valuable products.
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