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Flame-retardant and solid-solid phase change composites based on dopamine-decorated BP nanosheets/Polyurethane for efficient solar-to-thermal energy storage

2020; Elsevier BV; Volume: 164; Linguagem: Inglês

10.1016/j.renene.2020.09.067

1879-0682

Xiaosheng Du, Jinghong Qiu, Sha Deng, Zongliang Du, Xu Cheng, Haibo Wang,

Solar-Powered Water Purification Methods

For utilisation of solar energy, the development of form-stable phase change material (PCM) composites with excellent flame retardancy and superior solar–thermal conversion performance is critical. Here, by incorporating dopamine-decorated black phosphorus nanosheets ([email protected]) into polyethylene glycol-based polyurethane (PEG-PU), novel form-stable PCM composites (PBPCMs) having superior solar–thermal conversion performance and excellent flame retardancy were fabricated. [email protected], covalently bonded to PEG-PU, acted as an efficient photothermal filler to capture solar energy and convert it to thermal energy, while PEG-PU absorbed and stored the thermal energy via phase transition. A light irradiation experiment and thermal conductivity test demonstrated that introducing [email protected] effectively improved the solar–thermal conversion efficiency (up to 88.5%) and thermal conductivity (69.4% increase) of PCM composites. Moreover, by introducing [email protected] into PBPCMs, the total heat release and heat release rate decreased considerably, while the limiting oxygen index value and char yield increased, demonstrating the considerably enhanced flame retardancy of PCM composites. PBPCMs with superior solar–thermal conversion performance and excellent flame retardancy show considerable potential in the solar–thermal conversion and storage field.