In the molten Na2CO3-K2CO3,NaVO3 can catalyze the in-situ electroreduction of CO2 to prepare high value-added carbon-based products.Studying the molten salt structure of Na2CO3-K2CO3-NaVO3 system contributes to understand the electrode process mechanism and optimize the reaction conditions.The ionic structure of Na2CO3-K2CO3-NaVO3 molten salt system at 1073 K was investigated by a combination of Raman spectroscopy and quantum chemistry calculation using Gaussian and Molclus programs.The results show that VO43-generated by the reaction of CO32-and VO3-exists in the melts,apart from the presence of CO2-3,but VO3-doesn't exist.VO43-belongs to C1 point group symmetry,and the band located at 802 cm-1 in the Raman spectrum is caused by the symmetrical stretching vibration of the V—O bond in VO43-.As the mass fraction of NaVO3 in the system increases from 5%to 15%,the relative content of VO43-increases dramatically,while that of CO32-decreases accordingly in the molten salts.
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