三水醋酸钠相变储能材料的精确制备与储热性能优化  

Precise Preparation of Sodium Acetate Trihydrate Phase Change Material with Enhanced Thermal Energy Storage Performance

作　　者：宋文淇 张生娣 白万栋 耿占立 李翔[1,3] 任秀峰 张帅帅[1,3,4] 赵彬钰 申月 SONG Wenqi;ZHANG Shengdi;BAI Wandong;GENG Zhanli;LI Xiang;REN Xiufeng;ZHANG Shuaishuai;ZHAO Binyu;SHEN Yue(Key Laboratory of Green and High-end Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Salt Lake Chemical Engineering Research Complex,Qinghai University,Xining,810016,China;Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院青海盐湖研究所,盐湖资源绿色高值利用重点实验室,青海西宁810008 [2]青海大学部省合建盐湖化工大型系列研究设施,青海西宁810016 [3]青海省盐湖资源化学重点实验室,青海西宁810008 [4]中国科学院大学,北京100049

出　　处：《盐湖研究》2025年第2期61-70,共10页Journal of Salt Lake Research

基　　金：青海省自然科学基金面上项目(2023-ZJ-915M);青海大学盐湖化工大型系列研究设施开放研究项目(2023-DXSSKF-Z01)。

摘　　要：非一致熔融水合盐相变储热材料普遍存在的偏析现象是影响其热性能的关键因素之一。针对包晶转变导致的三水醋酸钠相变储能材料循环稳定性降低的问题,作者利用差示扫描量热法、原子力显微镜、X射线衍射等方法,以中低温水合盐相变储热材料三水醋酸钠为研究对象,对其相变行为与体系水含量的关系进行了定量分析,通过分析不同含水量的醋酸钠水合盐相变过程中的热物理性质及微观形貌,系统研究了含水量对醋酸钠水盐体系相变行为和循环性能的影响。结果表明,水含量的精确调控可使水合醋酸钠在熔融焓下降最小的情况下达到最佳循环稳定性,精确制备样品的初始熔融焓值为230.07 J/g,尽管与三水醋酸钠(258.50 J/g)相比有所减小,但50次循环后其熔融焓值提升至239.92 J/g,可见循环后相变焓不仅没有衰减,反而有所提升,相比相同次数循环后三水醋酸钠熔融焓14.08%的衰减率(由初始值258.50 J/g衰减到222.11 J/g),相变循环稳定性得到极大的提升,而保障体系相变循环稳定性的体系水含量临界值下限为41.50%(上限为:61.49%)。The common phase segregation in incongruent melting hydrated salt phase change materials is one of the key factors affecting their thermal performance.To address degradation of sodium acetate trihydrate phase change material caused by the peritectic transformation,the relationship between the phase transition behavior and the water content in the water-salt(sodium acetate)system was quantitatively analyzed by differential scanning calorimetry,atomic force microscopy,and X-ray diffraction methods.Testing the thermophysical properties and microscopic morphology of sodium acetate hydrated salt with varied water contents,the effects of water content on the phase change behavior and cycling performance of water-salt was systematically studied.The results showed that precise control of water content can achieve optimal cycling stability of hydrated sodium acetate with minimal loss of melting enthalpy.The initial melting enthalpy value of the precisely prepared sample was 230.07 J/g,which was slightly reduced compared to sodium acetate trihydrate(258.50 J/g).However,after 50 cycles,its melting enthalpy value increased to 239.92 J/g.The phase change enthalpy did not decay after cycling,but increased.Compared with the decay rate of 14.08%of sodium acetate trihydrate(from the initial value of 258.50 J/g to 222.11 J/g),phase change cycling stability of the precisely prepared sample was greatly improved.The lower limit of the critical water content in the system is 41.50%to ensure the stability of the system phase change cycling.

关 键 词：三水醋酸钠 水合盐 步进稀释法 相变储能材料 原子力显微镜 

分 类 号：TB34[一般工业技术—材料科学与工程]