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Flexible Phase Change Materials with High Energy Storage Density Based on Porous Carbon Fibers
Xiangqin Peng1, Lei Chen1, Bohong Li1
1Guangdong 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.
Flexible phase change fibers (PCFs) using hollow carbon fibers (HCFs) encapsulate phase change materials (PCMs) for high energy storage. These novel PCFs offer enhanced energy efficiency and durability for advanced energy applications.
Area of Science:
- Materials Science
- Energy Storage
- Nanotechnology
Background:
- Phase change fibers (PCFs) are crucial for energy efficiency due to their heat storage capabilities.
- Key challenges include enhancing energy storage density and maintaining fiber flexibility.
- Developing advanced PCFs is vital for diverse energy applications.
Purpose of the Study:
- To fabricate flexible PCFs with high energy storage density using hollow carbon fibers (HCFs) and phase change materials (PCMs).
- To investigate the encapsulation of lauric acid (LA) within HCFs for efficient heat storage.
- To explore manufacturing parameters influencing fiber structure and performance.
Main Methods:
- Electrospinning of PAN/ZIF-67 composite fibers to create precursor materials.
- Impregnation of hollow carbon fibers (HCFs) with lauric acid (LA) solution.
- Characterization of fiber morphology, structure, and phase change properties.
Main Results:
- Achieved high loading capacity (92%) and phase change enthalpy (153 J g⁻¹) for HCF/LA PCFs.
- Demonstrated that oriented fiber structure and gradient pre-oxidation enhance fiber integrity and morphology.
- Optimized HCF pore structure for efficient PCM encapsulation.
Conclusions:
- Successfully developed high-performance, flexible porous carbon nanofiber composites for phase change energy storage.
- Established a theoretical foundation for designing and producing advanced PCFs.
- These findings pave the way for improved energy efficiency in various applications.
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