Peng Xiangqin, Chen Lei, Li Bohong, Tang Zhe, Jia Yifan, Zhang Zhenyu Jason, Yu Qianqian, Wang LinGe
Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials, State Key Laboratory of Luminescent Materials and Devices, South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou 510640, China.
School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK.
Polymers (Basel). 2024 Dec 19;16(24):3547. doi: 10.3390/polym16243547.
Phase change fibers (PCFs) can effectively store and release heat, improve energy efficiency, and provide a basis for a wide range of energy applications. Improving energy storage density and preserving flexibility are the primary issues in the efficient manufacture and application development of PCFs. Herein, we have successfully fabricated a suite of flexible PCFs with high energy storage density, which use hollow carbon fibers (HCFs) encapsulated phase change materials (PCMs) to provide efficient heat storage and release, thereby enhancing energy efficiency and underpinning a broad range of energy applications. The flexible HCF/LA PCFs with high energy density were made by impregnating a small molecule LA solution, whereas the precursor of the PAN/ZIF-67 composite fibers was created by electrospinning. These PCFs have a high loading capacity for lauric acid (LA), demonstrating a 92% load percentage and a 153 J g phase change enthalpy value. The effects of doping quantity (ZIF-67), fiber orientation, pre-oxidation treatment, and particle size on the morphological and structural characteristics of HCFs, as well as the impact of HCFs' pore structure on PCM encapsulation, were investigated. It was found that the oriented fiber structure serves to reduce the likelihood of fracture and breakage of precursor fibers after carbonization, whilst the gradient pre-oxidation can maintain the original fiber morphology of the fibers after carbonization. These findings establish a solid theoretical foundation for the design and production of high-performance flexible porous carbon nanofiber wiping phase change composites.
相变纤维（PCFs）能够有效地储存和释放热量，提高能源效率，并为广泛的能源应用提供基础。提高储能密度和保持柔韧性是相变纤维高效制造和应用开发中的主要问题。在此，我们成功制备了一系列具有高储能密度的柔性相变纤维，其采用中空碳纤维（HCFs）封装相变材料（PCMs）来实现高效的热量储存和释放，从而提高能源效率并支撑广泛的能源应用。具有高能量密度的柔性HCF/月桂酸（LA）相变纤维是通过浸渍小分子月桂酸溶液制成的，而PAN/ZIF-67复合纤维的前驱体则是通过静电纺丝制备的。这些相变纤维对月桂酸具有高负载能力，负载率达92%，相变焓值为153 J/g。研究了掺杂量（ZIF-67）、纤维取向、预氧化处理和粒径对中空碳纤维形态和结构特征的影响，以及中空碳纤维孔结构对相变材料封装的影响。结果发现，取向纤维结构有助于降低碳化后前驱体纤维断裂和破损的可能性，而梯度预氧化可以保持碳化后纤维的原始形态。这些发现为高性能柔性多孔碳纳米纤维擦拭相变复合材料的设计和生产奠定了坚实的理论基础。
