Preparation and characterization of a solar-driven sodium acetate trihydrate composite phase change material with Ti4O7 particles
Preparation and characterization of a solar-driven sodium acetate trihydrate composite phase change material with Ti4O7 particles
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DOI：
10.1016/j.solmat.2022.111591
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发表时间：
2022-05
影响因子：
6.9
通讯作者：
H. Wang;Ying Zhang;Enda Ci;Xiao-qi Li;Lijiang Guo;Liu-yan Wu;Jianqiang Li
中科院分区：
文献类型：
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作者：
H. Wang;Ying Zhang;Enda Ci;Xiao-qi Li;Lijiang Guo;Liu-yan Wu;Jianqiang Li
相变材料蓄热技术因能有效缓解可再生能源供需矛盾而备受关注。为促进太阳能的热利用，研制了具有光热转换和储热性能的新型双功能醋酸钠（SAT）复合相变材料。选择具有全光谱吸收太阳光和高效光热转换性能的ti4o7颗粒作为光热转换介质。用5 wt%的十二水磷酸氢二钠（DSP）和3 wt%的羧甲基纤维素分别减少过冷和抑制SAT的相分离。不同ti4o7含量的SAT复合材料的过冷度为0.9 ~ 1.5℃，潜热为228.6 ~ 257.7 kJ kg-1。ti4o7具有覆盖全太阳光谱（200-2500 nm）的稳定吸收能力，SAT和DSP在1900 - 2500 nm的红外光吸收能力甚至超过ti4o7。由于SAT和DSP在长波红外波段具有突出的吸收能力，所以当ti4o7质量分数为10 wt%时，SAT复合样品的太阳总吸收容量比ti4o7质量分数为92.76%时高93.33%。所有SAT复合光热转换相变材料的光热存储效率均超过50%，其中ti4o7质量分数为10 wt%的复合材料光热转换存储效率最高，为76.63%。复合光热储能相变材料在太阳能系统中具有潜在的应用前景。
Thermal energy storage using phase change materials has received much attention as it can effectively relieve the contradiction of renewable energy between supply and demand. The novel bifunctional sodium acetate trihydrate (SAT) composite phase change materials with photo-thermal conversion and heat storage properties were developed to promote the thermal utilization of solar energy. The Ti4O7particles were selected as photo-thermal conversion media with full spectral absorption of sunlight and efficient photo-thermal conversion performance. 5 wt% disodium hydrogen phosphate dodecahydrate (DSP) and 3 wt% carboxymethyl cellulose were used to decrease supercooling and restrain phase separation of SAT, respectively. The as-prepared SAT composites with different content of Ti4O7possess a low supercooling degree of 0.9–1.5 °C and high latent heat of 228.6–257.7 kJ kg-1. Ti4O7has a stable absorption capacity covering the full solar spectrum (200–2500 nm) and the absorption capacity of SAT and DSP in the infrared light even more than Ti4O7at 1900 nm–2500 nm. The SAT composite sample with 10 wt% Ti4O7has the best total solar absorption capacity of 93.33% more than Ti4O7of 92.76% because SAT and DSP have outstanding absorption capacity in the long-wave infrared wavelength. The photo-thermal storage efficiency of all SAT composite photo-thermal conversion phase change materials exceeds 50%, of which the composite with 10 wt% Ti4O7has the optimal photo-thermal conversion storage efficiency of 76.63%. The composite photo-thermal storage phase change materials have potential applications in solar energy systems.