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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Preparation and characterization of quinary nitrate salt based composite phase change material with low melting point for low and medium temperature thermal energy storage
AU - Li, C.
AU - Leng, G.
AU - Han, L.
AU - Li, Q.
AU - Lu, H.
AU - Xu, R.
AU - Bai, Z.
AU - Du, Y.
AU - Wu, Y.
PY - 2023/12/25
Y1 - 2023/12/25
N2 - This work concerns the development of a shape-stable molten salt based composite phase change material (PCM) for low and medium temperature thermal energy storage. The composite is fabricated by using a cold compression and hot sintering method with the employment of a eutectic quinary nitrate salt of NaNO3-NaNO2-KNO3-KNO2-LiNO3 as PCM, halloysite nanotube (HNT) as skeleton supporting material and natural graphite as thermal conductivity enhancement additive. A sequence of characterizations is performed to investigate the composite microstructure, chemical and physical compatibility, thermal stability, phase change behaviour, and thermal conductivity as well as cycling performance. The results indicate that an excellent chemical compatibility has been achieved among the ingredients of quinary salt, HNT and graphite within the composite. A mass concentration of 50 wt% HNT endows the composite with the optimal formulation in which 10 wt% graphite can be successfully accommodated and a thermal conductivity around 1.31 W/m·K can be acquired. Moreover, in such a formulation, the composite presents a considerably low melting temperature of 72.4 °C and a high thermal decomposition temperature of 530 °C, which achieves the composite a relatively high energy storage density nearly 500 kJ/kg at a temperature range of 25–510 °C. The results presented in this work demonstrate that the quinary salt-HNT-graphite composite with fairly low phase transition temperature and a splendid combination of thermal properties and cycling performance could be a promising candidate to replace the conventional organic based PCMs utilized in low temperature thermal energy storage fields.
AB - This work concerns the development of a shape-stable molten salt based composite phase change material (PCM) for low and medium temperature thermal energy storage. The composite is fabricated by using a cold compression and hot sintering method with the employment of a eutectic quinary nitrate salt of NaNO3-NaNO2-KNO3-KNO2-LiNO3 as PCM, halloysite nanotube (HNT) as skeleton supporting material and natural graphite as thermal conductivity enhancement additive. A sequence of characterizations is performed to investigate the composite microstructure, chemical and physical compatibility, thermal stability, phase change behaviour, and thermal conductivity as well as cycling performance. The results indicate that an excellent chemical compatibility has been achieved among the ingredients of quinary salt, HNT and graphite within the composite. A mass concentration of 50 wt% HNT endows the composite with the optimal formulation in which 10 wt% graphite can be successfully accommodated and a thermal conductivity around 1.31 W/m·K can be acquired. Moreover, in such a formulation, the composite presents a considerably low melting temperature of 72.4 °C and a high thermal decomposition temperature of 530 °C, which achieves the composite a relatively high energy storage density nearly 500 kJ/kg at a temperature range of 25–510 °C. The results presented in this work demonstrate that the quinary salt-HNT-graphite composite with fairly low phase transition temperature and a splendid combination of thermal properties and cycling performance could be a promising candidate to replace the conventional organic based PCMs utilized in low temperature thermal energy storage fields.
KW - Composite phase change material
KW - Low melting temperature
KW - Quinary nitrate salt
KW - Shape stability
KW - Thermal energy storage
KW - Chemical stability
KW - Decomposition
KW - Graphite
KW - Heat storage
KW - Kaolinite
KW - Lithium compounds
KW - Melting point
KW - Nitrates
KW - Phase change materials
KW - Potash
KW - Potassium Nitrate
KW - Salt deposits
KW - Sintering
KW - Sodium nitrate
KW - Storage (materials)
KW - Thermal conductivity
KW - Composite phase change materials
KW - Cycling performance
KW - Halloysite nanotubes
KW - Low melting temperatures
KW - Lows-temperatures
KW - Medium temperature
KW - Nitrate salts
KW - Thermal energy
U2 - 10.1016/j.est.2023.109277
DO - 10.1016/j.est.2023.109277
M3 - Journal article
VL - 74
JO - Journal of Energy Storage
JF - Journal of Energy Storage
SN - 2352-152X
M1 - 109277
ER -