面向太阳能热管理的炭化榉木/聚乙二醇复合相变材料
Carbonized beech/polyethylene glycol composite phase change material for solar thermal management
为实现木材基相变材料的高储能密度、优异循环稳定性与高效光热转换的协同,提出一种协同工程策略。将天然榉木于900℃炭化构建定向孔道碳骨架,赋予其宽光谱吸收能力;采用动态真空浸渍法负载聚乙二醇,并通过六亚甲基二异氰酸酯原位交联封装。所得复合材料太阳光吸收优异,30 min升温至72℃,相变焓达170.24 J/g。经50次循环,焓值保留率95%,为高效太阳能热能管理提供了先进生物基材料路径。
To achieve a synergistic integration of high energy storage density,excellent cycling stability,and efficient solar-to-thermal energy conversion in wood-based phase-change materials,a synergistic engineering strategy was proposed.Natural beech wood was carbonized at 900℃ to construct a directional pore channel carbon framework,endowing it with broad-spectrum absorption capability.Polyethylene glycol was loaded via a dynamic vacuum impregnation method and encapsulated through in-situ crosslinking with hexamethylene diisocyanate.The resulting composite exhibits excellent solar absorption,reaching 72℃ within 30 min,with a phase change enthalpy of 170.24 J/g.After 50 thermal cycles,the enthalpy retention rate remained at 95%,providing an advanced bio-based material pathway for efficient solar thermal energy management.
榉木 / 光热转换 / 热能存储 / 热循环稳定性 / 高温炭化
beech wood / photothermal conversion / phase-change thermal energy storage / thermal cycle stability / high-temperature carbonization
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