Reduction of Carbon Dioxide to Carbon Nanostructures in Molten Salt: The Effect of Electrolyte Composition
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The effect of the composition of the molten salt electrolyte on the morphology of carbon produced via reduction of carbon dioxide has been studied. Three different molten salt compositions (CaCl2-CaO-Na2Co3, CaCl2-Na2Co3, and CaCl2-CaO) were applied at constant potential difference of 3.0 V and carbon dioxide flow of ~ 1 mL/s for 120 min, and the current was recorded at 10-s intervals. The powder products obtained from the solidified electrolyte and cathode surface were then characterized by scanning electron microscopy and energy-dispersive spectroscopy. Rod-like structures with diameter of 120 nm formed on the surface of the steel cathode after electrolysis using CaCl2-0.5% M CaO-2% M Na2CO3 or CaCl2-2% M Na2CO3.
The authors thank Sahand University of Technology for financial support.
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