Phase change materials (PCMs) are effective energy storage application, which can be combined with aerogels to improve heat conversion rate in building insulation materials. A low-cost microencapsulated PCMs (MEPCM) composited Al₂O₃–SiO₂ aerogels (MEPCM/ASA) have been successfully prepared by in situ sol–gel method following by ambient pressure drying (APD). The aerogels and the phase change microcapsules were well bonded without destroying the aerogels network structure. The morphology, microstructure, thermal conductivity, energy storage efficiency, and thermal stability of the MEPCM/ASA composite were comprehensively investigated. The experimental results showed that the composite revealed small shrinkage (4.1 wt%), high specific surface area (380.22 m²/g), and low thermal conductivity (0.0507 W/(m K)) at room temperature. The latent heat of the composites containing 50 wt% MEPCM reached 28.91 J/g around 26.7 °C. The MEPCM/ASA possessed good phase change behavior, low undercooling, and excellent thermal cycling stability. It was anticipated to provide a new path to achieve simultaneous enhancement of thermal insulation and thermal storage, and the application in building materials were of great importance for energy saving.

相变材料（PCM）是有效的能量存储应用，可以与气凝胶结合使用以提高建筑隔热材料的热转化率。一种低成本的微囊化PCM（MEPCM）复合Al ₂ O ₃ -SiO ₂气凝胶（MEPCM / ASA）已成功通过原位溶胶-凝胶法制备，然后进行了常压干燥（APD）。气凝胶和相变微胶囊结合良好，而不会破坏气凝胶的网络结构。全面研究了MEPCM / ASA复合材料的形貌，微观结构，导热系数，储能效率和热稳定性。实验结果表明，该复合材料收缩率小（4.1 wt％），比表面积高（380.22 m）。² / g），并且在室温下的导热系数低（0.0507 W /（m K））。含有50 wt％MEPCM的复合材料的潜热在26.7°C左右达到28.91 J / g。MEPCM / ASA具有良好的相变性能，较低的过冷度和出色的热循环稳定性。预计它将提供一条新的途径来实现同时提高隔热和蓄热能力，并且在建筑材料中的应用对于节能非常重要。