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Thermoelectric all-carbon heterostructures for a flexible thermoelectric generator
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-11-11 , DOI: 10.1039/d0se01591a Hyeonseok Hwang 1, 2, 3, 4 , Kwang-Suk Jang 1, 2, 3, 4
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-11-11 , DOI: 10.1039/d0se01591a Hyeonseok Hwang 1, 2, 3, 4 , Kwang-Suk Jang 1, 2, 3, 4
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Carbon nanotubes (CNTs) are thermoelectric materials with immense potential because of their flexible, lightweight, and solution-processable properties. Herein, we report a facile method for improving the thermoelectric performance of CNTs for application in flexible thermoelectric generators. By introducing carbon nanoparticles (CNPs) between the CNTs, all-carbon heterostructures could be formed. A barrier energy at the CNT–CNP interface can directly enhance the Seebeck coefficient (S). The all-carbon heterostructure films exhibited S and power factor values as high 54.0 ± 1.4 μV K−1 and 503 ± 49 μW m−1 K−2, respectively, which are 1.9 and 2.3 times higher than those of the CNT films without the heterostructures. Note that the thermoelectric performance is considered only from the point of view of the power factor. For complete characterization, the evaluation of thermal conductivity would be required. Using the all-carbon heterostructures as thermoelectric elements, a flexible thermoelectric generator of three-dimensionally stacked elements was fabricated for efficiently harvesting energy from a vertical temperature difference. The thermoelectric generator with a thermal contact area of 6 cm2 exhibited a maximum output power of 4.8 μW from a vertical temperature difference of 30 K. Thus, we developed a facile strategy for synthesizing high-performance thermoelectric all-carbon heterostructures and demonstrated their superior ability to harvest thermoelectric energy.
中文翻译：
柔性热电发电机的热电全碳异质结构
碳纳米管（CNTs）是具有巨大潜力的热电材料，因为它们具有柔韧性，重量轻和可溶液加工的特性。在此，我们报告了一种用于柔性热电发生器中提高CNTs热电性能的简便方法。通过在碳纳米管之间引入碳纳米颗粒（CNP），可以形成全碳异质结构。CNT-CNP界面处的势垒能量可以直接提高塞贝克系数（S）。全碳异质结构膜的S和功率因数分别高达54.0±1.4μVK -1和503±49μWm -1 K -2分别是没有异质结构的CNT膜的1.9和2.3倍。注意，仅从功率因数的角度考虑热电性能。为了完全表征，将需要对导热系数进行评估。使用全碳异质结构作为热电元件，制造了三维堆叠元件的柔性热电发生器，用于从垂直温差有效地收集能量。热接触面积为6 cm 2的热电发电机 在30 K的垂直温差下，其最大输出功率为4.8μW。因此，我们开发了一种用于合成高性能热电全碳异质结构的简便策略，并展示了其捕获热电能量的卓越能力。
更新日期：2020-11-23
中文翻译：
柔性热电发电机的热电全碳异质结构
碳纳米管（CNTs）是具有巨大潜力的热电材料，因为它们具有柔韧性，重量轻和可溶液加工的特性。在此，我们报告了一种用于柔性热电发生器中提高CNTs热电性能的简便方法。通过在碳纳米管之间引入碳纳米颗粒（CNP），可以形成全碳异质结构。CNT-CNP界面处的势垒能量可以直接提高塞贝克系数（S）。全碳异质结构膜的S和功率因数分别高达54.0±1.4μVK -1和503±49μWm -1 K -2分别是没有异质结构的CNT膜的1.9和2.3倍。注意，仅从功率因数的角度考虑热电性能。为了完全表征，将需要对导热系数进行评估。使用全碳异质结构作为热电元件，制造了三维堆叠元件的柔性热电发生器，用于从垂直温差有效地收集能量。热接触面积为6 cm 2的热电发电机 在30 K的垂直温差下，其最大输出功率为4.8μW。因此，我们开发了一种用于合成高性能热电全碳异质结构的简便策略，并展示了其捕获热电能量的卓越能力。
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