Electrodeposition of Carbon from CO₂ in Room-Temperature Ionic Liquid Triethylpentylphosphonium Bis(trifluoromethanesulfonyl)imide

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