The main objective of this work is to prepare completely biodegradable macrocapsules containing organic phase change materials (PCMs) for thermal energy storage applications. Three different PCMs hexadecane (paraffin), butyl stearate (ester) and caprylic acid (fatty acid) were encapsulated inside barium crosslinked pectin shell using ionic gelation method. Millimeter size(≤2 mm) pectin-PCM capsules were prepared with highest encapsulation efficiency of 83.66 wt% (H5), 83.21 wt% (B5) and 84.39 wt% (C5) containing hexadecane, butyl stearate and caprylic acid respectively as core, while corresponding melting enthalpies were 184.89 kJ kg⁻¹ (H5), 116 kJ kg⁻¹ (B5) and 118 kJ kg⁻¹ (C5). Pectin encapsulation improved thermal stability of PCM-capsules by 70 °C–130 °C compared to core PCMs. 25 g of H5, B5 and C5 capsules provided thermal buffering of 62 min, 50 min and 51mins respectively during discharge experiments. Thus, the prepared biodegradable pectin-PCM capsules are effective for thermal energy storage.

这项工作的主要目的是制备用于热能存储应用的含有有机相变材料 (PCM) 的完全可生物降解的大胶囊。使用离子凝胶法将三种不同的 PCM 十六烷（石蜡）、硬脂酸丁酯（酯）和辛酸（脂肪酸）封装在钡交联果胶壳内。以十六烷、硬脂酸丁酯和辛酸为核心，制备了毫米尺寸（≤2 mm）的果胶-PCM胶囊，包封率最高，分别为83.66 wt%（H5）、83.21 wt%（B5）和84.39 wt%（C5），而相应的熔化焓分别为 184.89 kJ kg ^-1 (H5)、116 kJ kg ^-1 (B5) 和 118 kJ kg ^-1(C5)。与核心 PCM 相比，果胶封装将 PCM 胶囊的热稳定性提高了 70°C–130°C。在放电实验期间，25 g H5、B5 和 C5 胶囊分别提供了 62 分钟、50 分钟和 51 分钟的热缓冲。因此，制备的可生物降解果胶-PCM胶囊可有效用于热能存储。