open access

https://hdl.handle.net/2115/88146

Direct conversion of carbon dioxide and steam into hydrocarbons and oxygenates using solid acid electrolysis cells

英語

2022-11-18

Cell Press

iScience

25(11)

105381

Electrolysis at intermediate temperatures (100-600 degrees C) is promising because high reaction rates and high product selectivity can be achieved simultaneously during CO2 reduction. However, intermediate temperature electrolysis has rarely been reported owing to electrolyte limntions. Here, solid acid electrolysis cells (SA:Cs) were adopted for electrochemically reducing CO2. Carbon monoxide, methane, methanol, ethane, ethylene, ethanol, acetaldehyde and propylene were produced from CO2 and steam, using Cu-containing composite cathodes at 220 degrees C and atmospheric pressure. The results demonstrate the potential of SAECs for producing valuable chemical feedstocks. At the SAEC cathode, CO2 was electrochemically reduced by protons and electrons. The product selectivity and reaction rate were considerably different from those of thermochemical reactions with gaseous hydrogen. Based on the differences, plausible reaction pathways were proposed.

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