Enhancement of p-type thermoelectric power factor by low-temperature calcination in carbon nanotube thermoelectric films containing cyclodextrin polymer and Pd
Enhancement of p-type thermoelectric power factor by low-temperature calcination in carbon nanotube thermoelectric films containing cyclodextrin polymer and Pd
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DOI：
10.1063/5.0051070
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发表时间：
2021-06-14
影响因子：
4
通讯作者：
Toshima, Naoki
中科院分区：
文献类型：
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作者：
Hata, Shinichi;Kusada, Mokichi;Toshima, Naoki
有机热电器件中碳纳米管（CNTs）的p型特性迫切需要改善，以满足大规模、低品位热能应用的需要。在这里，我们提出了一种合适的方法，以显着提高功率因数（PF），通过低温煅烧诱导的绝缘γ-环糊精聚合物（P γ CyD），这是用作膜状碳纳米管的增溶剂的热解，通过增加电导率。低温煅烧方法，它可以用来实现良好的CNT束之间的电接触，显示增强行为作为一个普遍的现象，不仅P γ CyD，但也为CNT膜的其他常用的聚合物。为了缓和煅烧温度，加入Pd催化剂，并将最佳温度从340 ℃降低到250 ℃。结果，CNT膜的PF值为570 μ Wm（-1）K（-2），发现其为原始CNT膜的PF值的两倍以上。此外，我们证明了基于这种p型CNT膜的热电发电机的能量收集能力;具有10个p型热电元件的热电发电机显示出10.3 μ W的最大功率输出，温差为75摄氏度，这与迄今为止证明的一些最好的单组分有机热电器件的最大功率输出相当。这种出色的输出功率表明，易于处理的CNT薄膜与低温热处理可以为热电发电机的发展开辟新的途径。(C)2021年作者。所有文章内容，除非另有说明，是根据知识共享署名（CC BY）许可证（http：//creativecommons.org/licenses/by/4.0/）。
The p-type properties of carbon nanotubes (CNTs) in organic thermoelectric devices need urgent improvement for large-scale, low-grade thermal energy applications. Here, we present a suitable approach to significantly enhance the power factor (PF) by increasing the electrical conductivity through the low-temperature calcination-induced pyrolysis of the insulating gamma-cyclodextrin polymer (P gamma CyD), which is used as a solubilizer of film-like CNTs. The low-temperature calcination method, which can be used to realize good electrical contact between CNT bundles, shows enhancement behavior as a universal phenomenon for not only P gamma CyD but also other commonly used polymers for CNT films. To moderate the calcination temperature, the Pd catalyst was added, and the optimal temperature was reduced from 340 degrees C to 250 degrees C. Consequently, the PF value of the CNT film was 570 mu Wm(-1)K(-2), which was found to be more than twice that of the original CNT film. In addition, we demonstrated the energy harvesting capability of a thermoelectric generator based on this p-type CNT film; a thermoelectric generator with 10 p-type thermoelectric elements showed a maximum power output of 10.3 mu W with a temperature difference of 75 degrees C, which is comparable to the maximum power output of some of the best single-component organic thermoelectric devices demonstrated to date. This outstanding output power shows that easy-to-handle CNT films with low-temperature heat treatment can open new avenues for the development of thermoelectric generators. (C) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).