Sun Wenchang, Hou Yueming, Zhang Xu
Hebei key Laboratory of Functional Polymers, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
Nanomaterials (Basel). 2021 Dec 21;12(1):2. doi: 10.3390/nano12010002.
A novel type of bi-functional microencapsulated phase change material (MEPCM) microcapsules with thermal energy storage (TES) and carbon dioxide (CO) photoreduction was designed and fabricated. The polyaniline (PANI)/titanium dioxide (TiO)/PCN-222(Fe) hybrid shell encloses phase change material (PCM) paraffin by the facile and environment-friendly Pickering emulsion polymerization, in which TiO and PCN-222(Fe) nanoparticles (NPs) were used as Pickering stabilizer. Furthermore, a ternary heterojunction of PANI/(TiO)/PCN-222(Fe) was constructed due to the tight contact of the three components on the hybrid shell. The results indicate that the maximum enthalpy of MEPCMs is 174.7 J·g with encapsulation efficiency of 77.2%, and the thermal properties, chemical composition, and morphological structure were well maintained after 500 high-low temperature cycles test. Besides, the MEPCM was employed to reduce CO into carbon monoxide (CO) and methane (CH) under natural light irradiation. The CO evolution rate reached up to 45.16 μmol g h because of the suitable band gap and efficient charge migration efficiency, which is 5.4, 11, and 62 times higher than pure PCN-222(Fe), PANI, and TiO, respectively. Moreover, the CO evolution rate decayed inapparently after five CO photoreduction cycles. The as-prepared bi-functional MEPCM as the temperature regulating building materials and air purification medium will stimulate a potential application.
设计并制备了一种新型的具有热能存储（TES）和二氧化碳（CO₂）光还原功能的双功能微胶囊化相变材料（MEPCM）微胶囊。聚苯胺（PANI）/二氧化钛（TiO₂）/PCN-222（Fe）混合壳通过简便且环保的Pickering乳液聚合包裹相变材料（PCM）石蜡，其中TiO₂和PCN-222（Fe）纳米颗粒（NPs）用作Pickering稳定剂。此外，由于混合壳上三种组分的紧密接触，构建了PANI/(TiO₂)/PCN-222（Fe）三元异质结。结果表明，MEPCMs的最大焓为174.7 J·g⁻¹，封装效率为77.2%，经过500次高低温循环测试后，其热性能、化学成分和形态结构得到了很好的保持。此外，MEPCM在自然光照射下用于将CO₂还原为一氧化碳（CO）和甲烷（CH₄）。由于合适的带隙和高效的电荷迁移效率，CO₂释放速率达到45.16 μmol g⁻¹ h⁻¹，分别比纯PCN-222（Fe）、PANI和TiO₂高5.4倍、11倍和62倍。此外，经过五次CO₂光还原循环后，CO₂释放速率下降不明显。所制备的双功能MEPCM作为温度调节建筑材料和空气净化介质将具有潜在的应用前景。
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