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

机译：由MWCNT掺杂的太阳能盐作为CSP的有希望的高导热率材料

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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.
机译：相比于其它的熔融盐太阳能盐在太阳能热发电很大的优势，但其热导率有待进一步提高。多壁碳纳米管（MWCNT）具有优良的热性能，可提高材料作为添加剂的热传导率。在这项研究中，通过高温熔融法准备了5种不同掺杂量太阳能盐/多壁碳纳米管复合材料的。结果表明，与多壁碳纳米管掺杂确实可以提高太阳能盐的热性能。我们为了解释这些现象，研究了它们的定量构效关系（QSAR）。根据TG-DSC分析，有在熔点和分解温度几乎没有变化; XRD分析表明，该材料的大部分是静止的NaNO 3和KNO 3，其中并没有改变;并根据阿基米德法，该材料的密度也变化不大。的材料的热传导率通过激光闪光法测量;表明，用0.3％的掺杂的试样的热导率增加了293％，达到1.65宽（m K）的结果（ - 1）。 XPS分析表明，多壁碳纳米管进行纯化和杂质组后高温熔化在很大程度上去除。从激光拉曼分析，用0.3％的掺杂样品的V-3频率峰红移，而对于其它样品是蓝移。该SEM图像表明，用0.3％的掺杂样品是最均匀地分散。当掺杂量是适当的，在热传导性的改善可以归因于两个原因：（1）多壁碳纳米管可均匀地分散，作为SEM显示; （2）微小导热通道可熔融盐和多壁碳纳米管之间的界面上形成，从而产生一个边界效应。这种复合材料的可能有助于改善太阳能蓄热和热传递能力，并由此增加太阳能热发电的效率。

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  • 来源
    《RSC Advances》 |2018年第34期|共10页
  • 作者

    Wu Yanze; Li Jinli; Wang Min; Wang Huaiyou; Zhong Yuan; Zhao Youjing; Wei Ming; Li Yan;

  • 作者单位

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens &

    Highly Efficient Utilizat Sa Xining 810000 Qinghai Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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