In this work, a novel eco-friendly form-stable phase change material (PCM) was synthetized based on latent heat storage material of polyethylene glycol (PEG) and supporting material of rice husk ash (RHA). To enhance the thermal properties of the form-stable PCM, rough RHA (rRHA) was modified by an ultrasonic hydrochloric acid treatment to unblock the pores stacked by non-crystal silica. The modified RHA (mRHA) behaved an optimized pore structures, in which the BJH pore volume and the BET surface area showed 24.8% and 12.8% increases compared with rRHA. The latent heat of 119.3 J/g for PEG/mRHA form-stable PCM was 20.9% higher than that of PEG/rRHA form-stable PCM due to deep filling of PEG into the non-crystal silica stacked pores of mRHA. Moreover, Frenkel-Halsey-Hill (FHH) theory was introduced to quantitatively characterize the surface complexities of rRHA and mRHA. The result showed the increased surface complexity of mRHA, leading to greater nucleation promotion for PEG. Thus, PEG/mRHA achieved the improved crystallization behaviors. In addition, PEG/mRHA showed favorable thermal cycling reliability after 300 thermal cycles. Therefore, PEG/mRHA provides a new insight into the improved resource utilization and functionality of RHA in terms of eco-friendly form-stable PCM for thermal energy storage.

在这项工作中，基于聚乙二醇 (PEG) 潜热蓄热材料和稻壳灰 (RHA) 支撑材料，合成了一种新型环保的形状稳定相变材料 (PCM)。为了提高形状稳定的 PCM 的热性能，通过超声波盐酸处理对粗糙的 RHA (rRHA) 进行改性，以疏通非晶二氧化硅堆积的孔隙。改性 RHA (mRHA) 表现出优化的孔结构，其中 BJH 孔体积和 BET 表面积与 rRHA 相比分别增加了 24.8% 和 12.8%。PEG/mRHA 形式稳定的 PCM 的潜热为 119.3 J/g，比 PEG/rRHA 形式稳定的 PCM 的潜热高 20.9%，这是由于 PEG 深填充到 mRHA 的非晶二氧化硅堆积孔中。而且，引入 Frenkel-Halsey-Hill (FHH) 理论来定量表征 rRHA 和 mRHA 的表面复杂性。结果表明，mRHA 的表面复杂性增加，导致 PEG 的成核促进作用更大。因此，PEG/mRHA 实现了改进的结晶行为。此外，PEG/mRHA 在 300 次热循环后表现出良好的热循环可靠性。因此，PEG/mRHA 在用于热能储存的环保形式稳定的 PCM 方面为 RHA 的改善的资源利用和功能提供了新的见解。