期刊
ENERGIES
卷 14, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/en14237869
关键词
CO2 capture; CO2 conversion; carbon capture and utilization; electrochemical capture; syngas; electrodialysis
This study introduces a simple electrochemical system capable of capturing gaseous carbon dioxide and converting it into syngas. By optimizing the capture and conversion modules, efficient capture and conversion of CO2 were achieved.
We report on a simple electrochemical system able to capture gaseous carbon dioxide from a gas mixture and convert it into syngas. The capture/release module is implemented via regeneration of NaOH and acidification of NaHCO3 inside a four-chamber electrochemical flow cell employing Pt foils as catalysts, while the conversion is carried out by a coupled reactor that performs electrochemical reduction of carbon dioxide using ZnO as a catalyst and KHCO3 as an electrolyte. The capture module is optimized such that, powered by a current density of 100 mA/cm(2), from a mixture of the CO2-N-2 gas stream, a pure and stable CO2 outlet flow of 4-5 mL/min is obtained. The conversion module is able to convert the carbon dioxide into a mixture of gaseous CO and H-2 (syngas) with a selectivity for the carbon monoxide of 56%. This represents the first all-electrochemical system for carbon dioxide capture and conversion.
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