N掺杂多孔碳海绵定形芒硝基复合相变材料的制备及其热性能  

Preparation and thermal performance of nitrogen-doped porous carbon sponge-type mirabilite-based composite phase-change material

作　　者：王亮 柳馨 汪长安 铁生年[1] WANG Liang;LIU Xin;WANG Changan;TIE Shengnian(New Energy Photovoltaic Industry Research Institute,Qinghai University,Xining 810016,Qinghai,China;School of Materials Science and Engineering,Qinghua University,Beijing 100084,China)

机构地区：[1]青海大学新能源光伏产业研究中心,青海西宁810016 [2]清华大学材料学院,北京100084

出　　处：《储能科学与技术》2023年第1期79-85,共7页Energy Storage Science and Technology

基　　金：青海省自然基金项目(2021-ZJ-906)。

摘　　要：芒硝相变储能材料作为一种潜热值高、来源广泛的无机水合盐,因存在相分层、过冷度等问题,限制了其在储能领域的广泛应用。本工作以N掺杂多孔碳为载体,将芒硝相变储能材料与N掺杂多孔碳复合,解决芒硝相变储能材料在实际应用中存在的问题。基于水热反应在聚氨酯泡沫上负载N原子,随后通过高温碳化得到N掺杂的多孔碳海绵(NPCS-M),并将其作为Na_(2)SO_(4)·10H_(2)O/Na_(2)HPO_(4)·12H_(2)O共晶盐的载体,最终制备出N掺杂多孔碳海绵封装的芒硝基复合相变材料(NPCM)。结果表明:N掺杂多孔碳海绵为蜂窝状结构,N含量为4.3%,比表面积为42.52 m^(2)/g,该材料对共晶盐的吸附量达到了自重的120倍。同时研究了该材料在5~60℃温度范围内循环1000次、3000次和5000次后的固液相变性能,经5000次循环后,该复合相变材料的潜热仍在130 J/g以上,且有降低共晶盐多次循环后过冷度的作用。该N掺杂多孔碳海绵复合相变材料在储能领域具有广阔的应用前景。Given its issues with phase stratification and supercooling degree,mirabilite phasechange energy storage material,a type of inorganic hydrated salt with a high latent heat value and abundant source,has been restricted in its wide application in the field of energy storage.In this study,nitrogen-doped porous carbon is used as the carrier,and the mirabilite phase-change energy storage material is compounded with nitrogen-doped porous carbon to solve the problems in the practical application of mirabilite phase-change energy storage material.Through a hydrothermal reaction,nitrogen atoms were loaded on the polyurethane foam,and then the nitrogen-doped porous carbon sponge(NPCS-M) was obtained by high-temperature carbonization.The NPCS-M was used as the carrier of Na_(2)SO_(4)·10H_(2)O/Na_(2)HPO_(4)·12H_(2)O eutectic salt,and finally,the mirabilite-based composite phase-change material(NPCS-M) encapsulated by nitrogen-doped porous carbon sponge was prepared.The results showed that the nitrogendoped porous carbon sponge was a honeycomb structure,with an N content of 4.3% and a specific surface area of 42.52 m^(2)/g.The adsorption capacity of the material for the eutectic salt reached 120 times its weight.Simultaneously,the composite phase-change material’s solid-liquid phase transformation properties after 1000,3000,and 5000 cycles at 5—60℃were studied.After 5000 cycles,the latent heat of the composite phase-change material was still above 130 J/g,and it can reduce the supercooling degree of eutectic salt after multiple cycles.The nitrogen-doped porous carbon sponge,a composite phase-change material,has a wide range of applications in the field of energy storage.

关 键 词：N掺杂 多孔碳海绵 定形 共晶盐 热性能 

分 类 号：TQ127.11[化学工程—无机化工]