Abstract Microencapsulated phase change materials (microPCMs) are not only important thermal energy storage medium but can also be applied in harvesting and storage of solar thermal energy by using solar absorbent materials as the shell. In this study, high energy storage polyurea (PUA) microPCMs for photothermal storage were fabricated from a Pickering emulsion consisting of bio-derived and sustainable regenerated chitin (RCh) from shrimp shells as the emulsifier. Graphene oxide (GO) was used as the photon captor and paraffin wax as the phase change material (PCM). The chemical, physical and thermal properties of the resulting microPCMs were studied. Using 0.1% w/w RCh Pickering emulsifier and 0.1% w/w GO to modify the microPCM, a 92.3% encapsulation efficiency was achieved. The microPCM at a core/shell ratio of 9:1 stored up to 234.7 J/g heat energy, was leak proof, and thermally reliable over 100 heating and cooling cycles with efficient photothermal conversion up to 76.03% conversion efficiency. Therefore, this cost-effective green process can be embraced for fabrication of high-energy storage and reliable functional microPCMs.

中文翻译：

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来自再生甲壳素 Pickering 乳液的高储能氧化石墨烯改性相变微胶囊用于光热转换

摘要 微封装相变材料（microPCMs）不仅是重要的热能储存介质，而且以太阳能吸收材料为外壳也可用于太阳能热能的收集和储存。在这项研究中，用于光热存储的高储能聚脲 (PUA) microPCMs 是由 Pickering 乳液制成的，该乳液由来自虾壳的生物衍生和可持续再生几丁质 (RCh) 作为乳化剂组成。氧化石墨烯（GO）用作光子俘获器，石蜡用作相变材料（PCM）。研究了所得 microPCMs 的化学、物理和热性能。使用 0.1% w/w RCh Pickering 乳化剂和 0.1% w/w GO 改性 microPCM，实现了 92.3% 的包封效率。核壳比为 9:1 的 microPCM 最多可存储 234 个。7 J/g 热能，防漏，热可靠超过 100 次加热和冷却循环，有效光热转换效率高达 76.03%。因此，这种具有成本效益的绿色工艺可以用于制造高能量存储和可靠的功能 microPCM。