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

机译：MWCNT掺杂的太阳能盐是一种有前途的高导热率CSP材料

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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 NaNO _(3) and KNO _(3) , 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.
机译：与其他熔融盐相比，太阳能盐在太阳能热发电中具有巨大优势，但其导热系数需要进一步提高。多壁碳纳米管（MWCNT）具有出色的热性能，可以改善作为添加剂的材料的导热性。本研究采用高温熔融法制备了五种掺杂量不同的太阳盐/ MWCNTs复合材料。结果表明，掺杂多壁碳纳米管确实可以改善太阳盐的热性能。为了解释这些现象，我们研究了它们的定量构效关系（QSAR）。 TG-DSC分析表明，熔点和分解温度几乎没有变化。 XRD分析表明，该物质的大部分仍为NaNO_（3）和KNO_（3），没有变化。根据阿基米德的方法，材料的密度也几乎没有变化。通过激光闪光法测量材料的热导率;结果表明，掺杂量为0.3％的样品的热导率提高了293％，达到1.65 W（m K）〜（？1）。 XPS分析表明，高温熔融后，MWCNT被纯化并且杂质基团被大量去除。根据激光拉曼分析，掺杂0.3％的样品的V _（3）频率峰发生红移，而其他样品发生蓝移。 SEM图像表明，掺杂0.3％的样品是最均匀分散的。当掺杂量合适时，热导率的提高可归因于两个原因：（1）如SEM所示，MWCNT可均匀分散。 （2）在熔融盐和MWCNT之间的界面上可能会形成微小的导热通道，从而产生边界效应。这种复合材料可以帮助改善太阳能的储热和传热能力，从而提高太阳能热发电的效率。

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