Promoting Dual Electronic and Ionic Transport in PEDOT by Embedding Carbon Nanotubes for Large Thermoelectric Responses
Promoting Dual Electronic and Ionic Transport in PEDOT by Embedding Carbon Nanotubes for Large Thermoelectric Responses
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DOI：
10.1021/acsami.8b06850
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发表时间：
2018-07-18
影响因子：
9.5
通讯作者：
Yu, Choongho
中科院分区：
文献类型：
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作者：
Choi, Kyungwho;Kim, Suk Lae;Yu, Choongho
利用非传统有机材料进行热电（TE）能量转换，由于其机械柔性、重量轻和易于加工，在可穿戴电子产品和卷对卷制造中具有很大的前景。虽然典型的有机材料具有低热导率的优点，这会产生大的温度梯度，但相对小的热功率（或塞贝克系数）通常需要大量的TE腿来制造实际的TE器件。在这里，我们表明，聚（3，4-乙撑二氧噻吩）-甲苯磺酸酯（PEDOT-Tos）和碳纳米管（CNT）的混合物可以产生非常大的热电势，类似于14 mV/K在室温下通过化学还原。具有良好的导电性，在室温下观察到类似于1200 μ W/m K-2的非凡功率因数。大的功率因数可以归因于突出的双电子和离子传导，这是可能的，以促进通过嵌入在PEDOT中的CNT由于载流子迁移率的改善，相比之下，在文献中仅PEDOT样品的劣和广泛变化的TE性能。虽然较高的CNT浓度给出较大的电子贡献，但较长的还原或较低的CNT浓度提供较大的离子贡献。同时，良好分离的碳纳米管创建的PEDOT-Tos干预的碳纳米管结，抑制热传输。利用高TE响应的进一步研究可以极大地帮助开发实用的可穿戴和/或可批量生产的热能收集和存储设备。
Thermoelectric (TE) energy conversion with nontraditional organic materials is promising in wearable electronics and roll-to-roll manufacturing because of mechanical flexibility, lightweight, and easy processing. Although typical organic materials have a benefit of low thermal conductivity that creates a large temperature gradient, relatively small thermopower (or Seebeck coefficient) often requires copious number of TE legs to fabricate practical TE devices. Here, we show that hybrids of poly(3,4-ethylenedioxythiophene)-tosylate (PEDOT-Tos) and carbon nanotubes (CNTs) can produce extremely large thermopower, similar to 14 mV/K at room temperature by a chemical reduction. With decent electrical conductivity, an extraordinary power factor of similar to 1200 mu W/m K-2 at room temperature was observed. The large power factor could be attributed to prominent dual electronic and ionic conduction, which is likely to be promoted by embedding the CNTs in PEDOT due to the improvement in the carrier mobility, in comparison with the inferior and widely varying TE properties of PEDOT-only samples in the literature. While a higher CNT concentration gave a larger electronic contribution, a longer reduction or a lower CNT concentration provided a larger ionic contribution. Meanwhile, well-separated CNTs created CNT junctions intervened by PEDOT-Tos, suppressing the thermal transport. Further research utilizing the high TE responses could greatly help to develop practical wearable and/or mass-producible thermal energy harvesting and storage devices.