Flame-retardant and form-stable phase change composites based on black phosphorus nanosheets/cellulose nanofiber aerogels with extremely high energy storage density and superior solar-thermal conversion efficiency,Journal of Materials Chemistry A

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Flame-retardant and form-stable phase change composites based on black phosphorus nanosheets/cellulose nanofiber aerogels with extremely high energy storage density and superior solar-thermal conversion efficiency
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-29 , DOI: 10.1039/d0ta05078d
Xiaosheng Du _{1,

2,

3,

4,

5} , Jinghong Qiu _{1,

2,

3,

4} , Sha Deng _{1,

2,

3,

4} , Zongliang Du _{1,

2,

3,

4,

5} , Xu Cheng _{1,

2,

3,

4,

5} , Haibo Wang _{1,

2,

3,

4,

5}

Affiliation

Impregnating organic phase change materials (PCMs) into cellulose-based aerogels is considered as an accessible and effective technology to prevent the liquid leakage issue due to the superior surface tension and capillary force. However, the poor solar-thermal conversion performance, high flammability, and low thermal conductivity still restrict the large-scale application of organic PCMs. Herein, two-dimensional (2D)-layered black phosphorus (BP) nanosheets having a superior photothermal effect were synthesized from a BP crystal through ultrasonication-assisted liquid exfoliation. Then, novel form-stable PCM composites (CBPCMs) were prepared by impregnating n-octacosane into cellulose nanofiber (CNF)/BP hybrid aerogels. The porous aerogels adequately supported the n-octacosane and prevented the liquid leakage issue. Differential scanning calorimetry (DSC) analysis demonstrated that the synthesized CBPCMs based on CNF/BP hybrid aerogels possessed extremely high n-alkane loading capacity and thermal storage density (247.0–251.6 J g⁻¹). The incorporation of BP nanosheets into the aerogels considerably increased the thermal conductivity (89.0% increase) and solar-thermal conversion and storage efficiency (up to 87.6%) of the CBPCMs. Furthermore, with the increasing content of BP nanosheets in the aerogels, the heat release rate and total heat release of the CBPCMs decreased considerably, while the LOI value and char yield increased, thus revealing the significantly improved flame retardancy of the PCM composites. In conclusion, the CBPCMs show considerable potential in solar utilisation systems.

中文翻译：

基于黑磷纳米片/纤维素纳米纤维气凝胶的阻燃且形状稳定的相变复合材料，具有极高的储能密度和优异的太阳热转换效率

将有机相变材料（PCM）浸渍到纤维素基气凝胶中被认为是防止由于高级表面张力和毛细作用力而引起的液体泄漏问题的有效技术。然而，差的太阳热转换性能，高可燃性和低热导率仍然限制了有机PCM的大规模应用。在此，通过超声辅助液体剥离从BP晶体合成具有优异的光热效应的二维（2D）层的黑磷（BP）纳米片。然后，通过将正辛烷浸渍到纤维素纳米纤维（CNF）/ BP混合气凝胶中来制备新型形状稳定的PCM复合材料（CBPCM）。多孔气凝胶充分支持的Ñ-十八烷并防止液体泄漏问题。差示扫描量热法（DSC）分析表明，基于CNF / BP混合气凝胶的合成CBPCM具有极高的正构烷烃负载能力和储热密度（247.0–251.6 J g ^-1）。将BP纳米片结合到气凝胶中大大提高了CBPCM的热导率（提高了89.0％）以及太阳热转换和存储效率（高达87.6％）。此外，随着气凝胶中BP纳米片含量的增加，CBPCM的热释放速率和总热释放显着降低，而LOI值和焦炭产率增加，从而表明PCM复合材料的阻燃性显着提高。总之，CBPCM在太阳能利用系统中显示出巨大的潜力。

更新日期：2020-07-21

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