Solar salt doped by MWCNTs as a promising high thermal conductivity material for CSP

doi:10.1039/c8ra03019g

ISL OpenIR

	Solar salt doped by MWCNTs as a promising high thermal conductivity material for CSP
	Wu, Yanze; Li, Jinli; Wang, Min; Wang, Huaiyou; Zhong, Yuan; Zhao, Youjing; Wei, Ming; Li, Yan
第一作者	Wu, Yanze
	2018
发表期刊	RSC ADVANCES
ISSN	2046-2069
卷号	8 期号:34 页码:19251-19260
摘要	Solar salt has great advantages in solar thermal power generation compared to other molten salts, but its thermal conductivity needs to be further improved. Multi-walled carbon nanotubes (MWCNTs) have excellent thermal properties that can improve the thermal conductivity of materials as additives. In this study, five kinds of solar salt/MWCNTs composites with different doping amounts were prepared by a high-temperature melting method. The results showed that doping with MWCNTs can indeed improve the thermal properties of solar salt. We studied their quantitative structure-activity relationship (QSAR) in order to explain these phenomena. According to the TG-DSC analysis, there was almost no change in the melting point and decomposition temperature; the XRD analysis revealed that the bulk of the material was still NaNO3 and KNO3, which did not change; and according to Archimedes' method, the density of the materials also changes little. The thermal conductivity of the material was measured by the laser flash method; the results showed that the thermal conductivity of the sample with 0.3% doping increased by 293%, reaching 1.65 W (m K)(-1). XPS analysis showed that the MWCNTs were purified and the impurity groups were largely removed after high-temperature melting. From the laser Raman analysis, the V-3 frequency peak of the sample with 0.3% doping was red-shifted, and for the other samples was blue-shifted. The SEM images showed that the sample with 0.3% doping was the most uniformly dispersed. When the doping amounts are appropriate, the improvement in thermal conductivity may be attributed to two reasons: (1) the MWCNTs can be uniformly dispersed, as the SEM shows; (2) tiny thermally conductive channels may be formed on the interface between the molten salt and the MWCNTs, thereby generating a boundary effect. This kind of composite material may help improve solar heat storage and heat transfer capacity, and thereby increase the efficiency of solar thermal power generation.
DOI	10.1039/c8ra03019g
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6703
专题	中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Wu, Yanze,Li, Jinli,Wang, Min,et al. Solar salt doped by MWCNTs as a promising high thermal conductivity material for CSP[J]. RSC ADVANCES,2018,8(34):19251-19260.
APA	Wu, Yanze.,Li, Jinli.,Wang, Min.,Wang, Huaiyou.,Zhong, Yuan.,...&Li, Yan.(2018).Solar salt doped by MWCNTs as a promising high thermal conductivity material for CSP.RSC ADVANCES,8(34),19251-19260.
MLA	Wu, Yanze,et al."Solar salt doped by MWCNTs as a promising high thermal conductivity material for CSP".RSC ADVANCES 8.34(2018):19251-19260.

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