蜜胺碳气凝胶/共晶盐芒硝复合相变材料制备及其性能  

Preparation and Performance of Melamine Carbon Aerogels/Eutectic Glauber Salt Composite Phase Change Materials

作　　者：孙增宝 柳馨 铁生年 汪长安 SUN Zengbao;LIU Xin;TIE Shengnian;WANG Changan(New Energy Photovoltaic Industry Research Institute,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学,新能源光伏产业研究中心,西宁810016

出　　处：《硅酸盐学报》2024年第2期671-680,共10页Journal of The Chinese Ceramic Society

基　　金：青海省自然基金项目(2021-ZJ-906);材料复合新技术国家重点实验室(武汉理工大学)开放基金项目(2020-KF-1)。

摘　　要：为解决水合盐相变储能材料的泄露问题,进一步提高其循环稳定性,本工作选择蜜胺树脂泡沫(MF)为前驱体,经多级碳化制备出具有高比表面积、高负载量碳气凝胶。并以其为支撑材料,以添加0.2%(质量分数)碳颗粒的Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O复合共晶盐(EHS)为相变基质制备出碳气凝胶/共晶盐复合相变材料(PCMx)。相比于纯EHS,封装后的复合相变材料具有更优异的热稳定性。研究发现,经700℃碳化制备的碳气凝胶对EHS具有更好的防泄漏性和循环稳定性,经过5000次固-液循环后其负载量仍达到自身质量的122倍,相变潜热值仍然保持在200 J·g^(-1)以上,解决了芒硝水合盐相变储能材料的泄露问题和潜热多次循环后热损失大的问题,蜜胺碳气凝胶/共晶盐芒硝复合相变材料的研究成果有助于进一步推动水合盐相变材料在储能领域的应用。Introduction Hydrated salt phase change energy storage materials enable sustainable storage and release of thermal energy through the phase transition of crystalline water.This low-cost,environmentally friendly material has a high heat storage density.However,the significant heat loss and liquid phase leakage after multiple cycles become persistent challenges,restricting the large-scale application of the original hydrated salt phase change material.Consequently,the preparation of shape-stabilized composite phase change materials by infiltrating hydrated salt phase change materials into porous support structures is one of the investigated methods to address the encapsulation challenges of hydrated salt phase change materials.In this paper,carbon aerogels with a high adsorption capacity were prepared with melamine foam as a precursor.The carbon aerogels were used to encapsulate hydrated salt phase change materials.Methods Carbon aerogel was prepared via multistage temperature carbonization with melamine foam as a precursor.A composite eutectic salt material(EHS)of Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O with 0.2% glucose carbon nanoparticles was added as the phase change matrix.Shape-stabilized melamine carbon aerogel/eutectic salt composite phase change materials were prepared via vacuum melt impregnation.The apparent morphology of the prepared aerogels was determined by scanning electron microscopy(SEM).The composition of the aerogels was analyzed by X-ray diffractometry(XRD),and the interactions between the MF and the eutectic hydrate salts in the composite phase change materials were investigated by the Fourier infrared spectrometry(IR).The thermal conductivities of the samples at room temperature were determined by the Hot Disk thermal constant analysis.Also,the latent heat of the phase change material was analyzed by differential scanning calorimetry(DSC),and the thermal stabilities of the samples were assessed by the simultaneous thermal analysis.Results and discussion Melamine foam before carbonizat

关 键 词：蜜胺泡沫 碳气凝胶 共晶盐 相变材料 

分 类 号：TB34[一般工业技术—材料科学与工程]