Preparation and Performance Evaluation of Solar Salt-Based@Ti3C2Tx Phase Change Materials
Solar salt@Ti3C2Tx composite phase change material was prepared by melt blending method using binary nitrate composed of potassium nitrate and sodium nitrate as base salt.The microstructure and crystal structure of the composite phase change material were characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The phase and crystal structure of the composites were analyzed by X-ray photoelectron spectroscopy(XPS),the melting point,solidification temperature and specific heat capacity of the composites were measured by differential scanning calorimeter(DSC),and the thermal conductivity was measured by thermal constant analyzer.The results showed that Ti3C2Tx could be evenly dispersed into the internal structure of solar salts.When the mass fraction of Ti3C2Tx nanosheet was 1.5%,the specific heat capacity of molten salt nanofluid reached 2.13 J·g-1·K-1,which was 47%higher,and the heat storage capacity of the whole phase change thermal storage material was improved.At room temperature,the thermal conductivity was 1.320 5 W·m-1·K-1,with the increase of 37%,the heat transfer efficiency of phase change materials was improved.
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