Abstract
The electrochemical decomposition of CO2 gas to form carbon and oxygen gas was studied in CaCl2-CaO and LiCl-Li2O molten salts. A constant voltage was applied at 1173K and 923K, respectively. This process consists of (1)electrochemical reduction of oxide (formation of reductant), (2)thermal reduction of CO2 gas by reaction with the metal dissolved in the molten salt, and (3)ZrO2 anodic electrode worked as an oxygen ions conductor to remove oxygen ions from the molten salt. When 9.7 %CO2-Ar mixed gas was blown into CaCl2-CaO and LiCl-Li2O molten salts, the current efficiency was evaluated to be 78.5 % and 89.7 %, respectively, judged by the exhaust gas analysis and the supplied charge. After electrolysis, the aggregations of carbon nano-tubes and amorphous carbon particles were observed by transmission electron microscope.
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