将金属有机骨架MIL-101(Cr)-NH2与CaCl2通过浸渍的方法复合得到MIL-101(Cr)-NH2/CaCl2热化学蓄热复合材料。采用X射线衍射分析仪（XRD）、扫描电子显微镜（SEM）、能谱分析（EDS）、全自动比表面积及孔径分析仪以及同步热分析仪（TG-DSC）等分析了复合材料的表观形貌、盐含量、比表面积和蓄热密度等参数。结果显示,复合材料的盐含量为49%,在30℃、32%湿度下的最大吸水量为0.54 g(H2O)/g(样品),蓄热密度达到了1 204 kJ/kg,并且在经历了17次吸附-解吸循环后,其蓄热密度仅降低了6.5%,表现出优异的循环稳定性,出色的吸附性能表明这一新型复合材料在太阳能蓄热领域具有广阔的应用前景。
The metal organic framework MIL-101(Cr)-NH2 and CaCl2 were combined by impregnation to obtain MIL-101(Cr)-NH2/CaCl2 composite. The morphology, salt content, specific surface area and heat storage density of the composite were obtained by X-ray diffraction analyzer (XRD), scanning electron microscopy (SEM), energy spectrum analysis (EDS), fully automatic specific surface area and pore size analyzer, and synchronous thermal analyzer (TG-DSC). Results showed that, the salt content of the composite was 49%, its maximum water uptake was 0.54 g (H2O)/g (sample) at 30°C and 32% relative humidity, and its heat storage density was 1 204 kJ/kg. Its heat storage density only reduced by 6.5% after 17 adsorption-desorption cycles, showing excellent cycle stability. The high adsorption performance indicated that this new composite has broad application prospects in solar energy heat storage applications.
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