Composite Material Based on N‐Tetradecanol and Expanded Graphite for High‐Efficient Thermal Storage

Le résumé fourni par la source

To overcome low thermal conductivity and leakage in organic phase change materials (PCMs), a high‐performance composite is developed by combining n‐tetradecanol (TD, 92.3 wt%) with expanded graphite (EG) via vacuum impregnation. Pure TD exhibits high latent heat (243.82 J g−1 melting, 246.48 J g−1 solidification) but suffers from leakage and low conductivity (0.355 W m−1K−1). Leveraging EG's porous structure (33.16 m2 g−1 Brunauer–Emmett–Teller) and high conductivity (8.161 W m−1K−1), the optimized TD/EG composite (12:1 ratio) achieves latent heats of 218.84 J g−1 (melting) and 216.80 J g−1 (solidification), retaining ≈90.0% of TD's capacity, with stable phase transition temperatures (≈35.6‐35.7 °C). Crucially, thermal conductivity reaches 7.353 W m−1K−1 (20.7x improvement), leakage is eliminated (≤1.1% mass loss), and chemical stability is confirmed (Fourier‐transform infrared [FTIR]/X‐ray diffraction). After 1,200 thermal cycles, 94.7% latent heat is retained (207.17/204.16 J g−1) with minimal temperature drift (<0.85 °C). This resolves the trade‐off between energy density, thermal response, and reliability, establishing the composite as a benchmark for leak‐free, high‐conductivity thermal energy storage in solar and electronics applications.

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