Flexible MoS2/CNF/PEG phase change film with superior photothermal conversion and thermal energy storage
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abstract
High latent heat flexible phase change materials (PCMs) with photothermal conversion ability have great application potential in the field of advanced thermal management and efficient utilization of solar energy. However, the traditional organic PCM faces the challenges of easy leakage, bad solar light harvesting and poor flexibility. In this paper, cellulose nanofibers (CNF) incorporate molybdenum disulfide (MoS2) has been self-assembled into a flexible layered porous film, which has been used to encapsulate polyethylene glycol (PEG) and prepare phase change films. Due to the capillary forces of the layered porous structure and the hydrogen bonding between CNF and PEG, the composite phase change film showed excellent structure-stability and non-leakage performances. Besides, the addition of MoS2 enables the composite PCMs excellent solar harvesting ability, and the output voltage was increased from 63.8 mV to 147.9 mV, which explained the outstanding solar-thermal-electricity conversion. In addition, the phase change film showed latent heat capacity as high as 111.00 J/g. After 20 heating/cooling cycles, the composite PCMs remains the same phase change properties, suggesting good cycling performances. Therefore, the as-prepared phase change films were believed to show great application potential in the thermal management of flexible wearable devices.
