Novel high specific heat capacity ternary nitrate_nitrite eutectic salt for solar thermal energy storage

doi:10.1016/j.solmat.2021.111075

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	Novel high specific heat capacity ternary nitrate_nitrite eutectic salt for solar thermal energy storage
	Li, Jinli; Zhang, Yue; Zhao, Youjing; Wang, Min; Yang, Ying
第一作者	Li, Jinli
	2021-08-01
发表期刊	SOLAR ENERGY MATERIALS AND SOLAR CELLS
ISSN	0927-0248
卷号	227
摘要	A novel ternary eutectic salt KNO3-NaNO2-KNO2 (KNK) was designed and prepared for thermal energy storage (TES) in a concentrating solar power system (CSP). The thermo-physical properties of KNK such as melting point, decomposition temperature, fusion enthalpy, density, viscosity, thermal conductivity and specific heat capacity were determined respectively. Furthermore the thermal energy storage capacity was evaluated and discussed. Then a comparison of the thermo-physical properties between commercial Hitec and KNK was carried out. KNK showed smaller density, lower viscosity, slightly smaller thermal conductivity, much higher specific heat capacity and bigger thermal energy storage capacity. Raman spectrum displayed that the N-O of NaNO2 frequency peak at about 820 cm(-1) in KNK had more significant shift, which could be attributed to a stronger interaction between Na+ and NO2-. Scanning electron microscope (SEM) showed K and Na elements of Hitec were uniformly distributed, while K and Na elements of KNK were in complementary distribution which could be caused by stronger repulsion between Na+ and K+. It was concluded that the stronger interaction and repulsion were correlated to the higher specific heat capacity. Molecular dynamics (MD) simulation was performed to explore the different macroscopic properties of two molten salts from the perspective at molecular level. The characterizations of radial distribution functions (RDF), coordination number and angular distribution functions (ADF) suggested that the interaction between Na+ and NO2- is stronger and that the arrangement of ion clusters was looser in KNK. The results were in good agreement with the analysis of Raman spectrum and SEM.
DOI	10.1016/j.solmat.2021.111075
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34360
专题	盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Li, Jinli,Zhang, Yue,Zhao, Youjing,et al. Novel high specific heat capacity ternary nitrate_nitrite eutectic salt for solar thermal energy storage[J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS,2021,227.
APA	Li, Jinli,Zhang, Yue,Zhao, Youjing,Wang, Min,&Yang, Ying.(2021).Novel high specific heat capacity ternary nitrate_nitrite eutectic salt for solar thermal energy storage.SOLAR ENERGY MATERIALS AND SOLAR CELLS,227.
MLA	Li, Jinli,et al."Novel high specific heat capacity ternary nitrate_nitrite eutectic salt for solar thermal energy storage".SOLAR ENERGY MATERIALS AND SOLAR CELLS 227(2021).

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