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

doi:10.19799/j.cnki.2095-4239.2022.0451

摘要/Abstract

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Na₂SO₄·10H₂O/Na₂HPO₄·12H₂O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 m²/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。

关键词: N掺杂, 多孔碳海绵, 定形, 共晶盐, 热性能

Abstract:

Given its issues with phase stratification and supercooling degree, mirabilite phase-change 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 Na₂SO₄·10H₂O/Na₂HPO₄·12H₂O 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 nitrogen-doped porous carbon sponge was a honeycomb structure, with an N content of 4.3% and a specific surface area of 42.52 m²/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.

Key words: N doping, porous carbon sponge, stereotypy, eutectic salt, thermal performance

中图分类号:

王亮, 柳馨, 汪长安, 铁生年. 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[J]. 储能科学与技术, 2023, 12(1): 79-85.

Liang WANG, Xin LIU, Changan WANG, Shengnian TIE. Preparation and thermal performance of nitrogen-doped porous carbon sponge-type mirabilite-based composite phase-change material[J]. Energy Storage Science and Technology, 2023, 12(1): 79-85.

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样品	样品质量/g	吸附后样品质量/g	吸附量/%
PCM	0.0491	4.9300	100.3
NPCM	0.0414	3.9780	120.2

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