Abstract The development of solar thermal energy storage technologies associated with phase change materials (PCMs) can greatly improve the utilization efficiency of solar energy, which is of significance to alleviate the global energy shortage. A large number of photodriven shape-stabilized composite PCMs has been exploited in recent decades, while the majorities of studies have demonstrated that the properties of composite PCMs are improved at the expense of energy storage density owing to that the introduced functional materials are substituted for a considerable portion of phase change matrix. Here, three-dimensional (3D) porous skeletons composed of bacterial cellulose (BC) as the supporting material and MXene as the photothermal material are introduced into polyethylene glycol (PEG) to fabricate composite PCMs with excellent comprehensive properties. The obtained composite PCMs show excellent shape stability, efficient photothermal conversion ability and extremely high energy storage capacity, which sheds substantial light on the efficient utilization of solar energy.

中文翻译：

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用于光驱动形状稳定复合相变材料的细菌纤维素/MXene混合气凝胶

摘要 相变材料（PCMs）相关太阳能热储能技术的发展可以大大提高太阳能的利用效率，对缓解全球能源短缺具有重要意义。近几十年来，大量光驱动形状稳定的复合 PCM 被开发出来，而大多数研究表明，由于引入的功能材料取代了能量存储密度，复合 PCM 的性能以牺牲能量存储密度为代价得到了改善。相当一部分相变矩阵。这里，以细菌纤维素（BC）为支撑材料，MXene为光热材料的三维（3D）多孔骨架被引入聚乙二醇（PEG）中，以制备具有优异综合性能的复合PCM。获得的复合相变材料表现出优异的形状稳定性、高效的光热转换能力和极高的储能能力，为太阳能的高效利用提供了重要依据。