Effect of cell voltage on electrochemical conversion of CO2 to carbon materials in CaCl2 based molten salt
Using calcium chloride-based molten salt as electrolyte,CO2 was electrochemically converted into carbon materi-als.The effects of electrolysis voltage and molten salt composition on the preparation of carbon materials were investigated.The phase,morphology,element distribution,graphitization degree and other characteristics of carbon materials were char-acterized by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray energy dispersive spectroscopy(EDS),laser micro Raman spectroscopy(Raman)and other analysis methods.The results showed that in the CaCl2-5%CaO molten salt at 800℃,the electrolytic produccts with the cell voltage of 1.9 V had thin morphology and the carbon con-tent was 98.24%.With the increase of voltage,the products were tended to form rod like structures and the length of rod like products was increased.The ternary molten salt CaCl2-NaCl-KCl-5%CaO with a lower melting point was used for electroly-sis,which reduced the energy consumption for preparing carbon materials and reduced the corrosion of anodes.The main morphologies of the products obtained were nanotube,granular and spherical.The effect of electrolysis voltage on the prod-uct appearance was significant.The high cell voltage could increase the current of the reaction process,accelerate the elec-trochemical reaction kinetics,and lower the degree of graphitization of carbon materials.
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