Zhang Tao, Zhu Juya, Yang Pei, Chen Weimin, Tian Qingwen, Li Xinghui, Chen Minzhi, Zhou Xiaoyan
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; International Innovation Center for Forest Chemicals and Materials, Nanjing 210037, China; Jiangsu Engineering Research Center of Fast-growing Trees and Agri-fiber Materials, Nanjing 210037, China.
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China; Shandong Huatai Paper Co., Ltd. & Shandong Yellow Triangle Biotechnology Industry Research Institute Co. LTD, Dongying 257335, China.
Int J Biol Macromol. 2025 May;309(Pt 1):142753. doi: 10.1016/j.ijbiomac.2025.142753. Epub 2025 Apr 1.
Phase change materials are essential for sustainable thermal management, but challenges such as leakage, formability loss, low thermal conductivity, and poor photo-thermal conversion efficiency limit their stability and versatility. Herein, we propose a simple yet effective carbonization strategy that leverages the inherent three-dimensional, oriented, and hierarchical cellulose skeleton of carbonized wood (CW) to support polyethylene glycol (PEG). When the carbonization temperature is 1000 °C and the heating rate is 3-5 °C/min, the CW's maximum specific surface area and average pore diameter reach as high as 598.19 m/g and 3.25 nm, respectively. Furthermore, the thermal conductivity of the CW-PEG composite phase change energy storage materials (CW-PEG composite PCESMs) increases to 0.434 W/m·K. The CW-PEG composite PCESMs exhibit a melting enthalpy of 130.5 J/g and an energy storage efficiency of 99.8 %. The surface temperature variations captured by the infrared camera during the heating and cooling cycles underscore the outstanding solar energy conversion efficiency of CW-PEG composite PCESMs. Moreover, even after 50 cycles, the phase change enthalpy retains 95 %, highlighting the CW-PEG composite PCESMs promising potential for energy-efficient building materials and cold chain transportation.
相变材料对于可持续热管理至关重要，但诸如泄漏、成型性损失、低导热性和差的光热转换效率等挑战限制了它们的稳定性和通用性。在此，我们提出了一种简单而有效的碳化策略，该策略利用碳化木材（CW）固有的三维、定向和分级纤维素骨架来负载聚乙二醇（PEG）。当碳化温度为1000℃且加热速率为3-5℃/分钟时，CW的最大比表面积和平均孔径分别高达598.19 m²/g和3.25 nm。此外，CW-PEG复合相变储能材料（CW-PEG复合PCESM）的导热率增加到0.434 W/m·K。CW-PEG复合PCESM的熔化焓为130.5 J/g，储能效率为99.8%。红外摄像机在加热和冷却循环期间捕获的表面温度变化突出了CW-PEG复合PCESM出色的太阳能转换效率。此外，即使经过50个循环，相变焓仍保留95%，这突出了CW-PEG复合PCESM在节能建筑材料和冷链运输方面的潜在应用前景。
