Electrodeposition of Carbon from CO<sub>2</sub> in Room-Temperature Ionic Liquid Triethylpentylphosphonium Bis(trifluoromethanesulfonyl)imide

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書誌事項

公開日
2023-09-01
資源種別
journal article
権利情報
  • http://creativecommons.org/licenses/by/4.0/
  • https://iopscience.iop.org/info/page/text-and-data-mining
DOI
  • 10.1149/1945-7111/acfa24
公開者
The Electrochemical Society

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説明

<jats:p>The conversion of CO<jats:sub>2</jats:sub> to solid carbon by the electrochemical method is an attractive process as a CO<jats:sub>2</jats:sub> recycling technology, but the electrolyte has been limited to high-temperature molten salts. In this study, the electrodeposition of solid carbon from CO<jats:sub>2</jats:sub> on an Ag substrate in triethylpentylphosphonium bis(trifluoromethanesulfonyl)imide at room temperature and 1 atm CO<jats:sub>2</jats:sub> atmosphere was investigated. Cyclic voltammetry with multiple cycles revealed that the three potential steps causing reduction, oxidation, and reduction current are important for the carbon electrodeposition from CO<jats:sub>2</jats:sub>. Based on the cyclic voltammogram, potentiostatic electrolysis was performed in the three potential steps. Consequently, the Ag substrate was covered with a black film because of the electrodeposited solid carbon. Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy revealed that the deposits were composed of the electrodeposited solid carbon and nanometer-size silver particles coming from the Ag substrate. From the experimental results, we propose a model of the electrochemical formation mechanism of solid carbon from CO<jats:sub>2</jats:sub> on the Ag substrate. This study shows that the electrochemical method has the potential to convert CO<jats:sub>2</jats:sub> into valuable carbonaceous materials with optimized electrochemical parameters, even at room temperature, and that this technique will contribute to developing a carbon-circulation society.</jats:p>

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