In this paper, a novel environment-friendly form-stable phase change material (PCM) was prepared by use of a mechanical mixing and the impregnation method for thermal energy storage. An agricultural solid waste rice husk ash (RHA) was acted as supporting material due to its natural high porosity and surface area, as well as organic paraffin (PA) was selected as core material used for heat storage. Particularly, acid-treated RHA with higher loading capacity compared to rough RHA was used as a support to stabilize PA. X-ray fluorescence method (XRF) and nitrogen adsorption analysis (N₂ adsorption) indicated that the impurities within RHA was effectively removed, the pore volume and specific surface area were increased by 37.3% and 54.2% after acid treatment. The leakage test exhibited that the prepared PA/RHA containing 50 wt% PA can maintain solid shape without leakage in melting state of organic PA. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy (ATR-FTIR) results suggested that there was no chemical reaction occurred between PA and RHA with the superior combination. Differential scanning calorimetry (DSC) was used to record the phase change properties of PA/RHA with the phase change temperature of 51.5 °C and latent heat of 68.1 J/g. Moreover, the prepared composite PCM maintained favorable thermal cycling reliability, being subjected to 200 thermal cycles. Furthermore, Thermal gravimetric analysis (TGA) illustrated a beneficial effect of RHA on the thermal stability of PA. Therefore, the prepared composite PCM can be regarded as a potential environment-friendly candidate for thermal energy storage in building energy efficiency.

本文通过机械混合和浸渍法储热制备了一种新型的环境友好型形稳定相变材料（PCM）。农业固体废稻壳灰（RHA）由于其天然的高孔隙率和表面积而被用作支撑材料，并且有机石蜡（PA）被选作储热的核心材料。特别地，与粗糙RHA相比具有更高负载能力的酸处理RHA被用作稳定PA的载体。X射线荧光法（XRF）和氮吸附分析（N ₂吸附）表明，酸处理后RHA中的杂质被有效去除，孔体积和比表面积分别增加了37.3％和54.2％。泄漏测试表明，所制备的包含50wt％PA的PA / RHA可以保持固体形状而不会在有机PA的熔融状态下泄漏。衰减全反射傅立叶变换红外光谱（ATR-FTIR）光谱（ATR-FTIR）结果表明，高级组合在PA和RHA之间没有发生化学反应。使用差示扫描量热法（DSC）记录PA / RHA的相变特性，相变温度为51.5°C，潜热为68.1 J / g。而且，所制备的复合材料PCM经受200次热循环，保持了良好的热循环可靠性。此外，热重分析（TGA）说明了RHA对PA热稳定性的有益作用。因此，所制备的复合材料PCM可以被认为是建筑节能中热能存储的潜在环境友好候选者。