Ultrahigh‐Power‐Factor Carbon Nanotubes and an Ingenious Strategy for Thermoelectric Performance Evaluation

Zhou, Wenbin; Fan, Qingxia; Zhang, Qiang; Li, Kewei; Cai, Le; Gu, Xi; Yang, Feng; Zhang, Nan; Xiao, Zhuojian; Hui-liang, Chen; Xiao, Shiqi; Wang, Yanchun; Liu, Huaping; Zhou, Weiya; Xie, Songhai

doi:10.1002/smll.201600501

Cited by 78 publications

(69 citation statements)

References 39 publications

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“…5 and Supplementary Table 3. More details of the measuring apparatus and method can be also found in our recent study55. The resistance and voltage were measured using a Keithley 2400 multimetre, and the whole system was controlled by a computer through LabVIEW programmes.…”

Section: Methodsmentioning

confidence: 99%

High-performance and compact-designed flexible thermoelectric modules enabled by a reticulate carbon nanotube architecture

et al. 2017

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It is a great challenge to substantially improve the practical performance of flexible thermoelectric modules due to the absence of air-stable n-type thermoelectric materials with high-power factor. Here an excellent flexible n-type thermoelectric film is developed, which can be conveniently and rapidly prepared based on the as-grown carbon nanotube continuous networks with high conductivity. The optimum n-type film exhibits ultrahigh power factor of ∼1,500 μW m−1 K−2 and outstanding stability in air without encapsulation. Inspired by the findings, we design and successfully fabricate the compact-configuration flexible TE modules, which own great advantages compared with the conventional π-type configuration modules and well integrate the superior thermoelectric properties of p-type and n-type carbon nanotube films resulting in a markedly high performance. Moreover, the research results are highly scalable and also open opportunities for the large-scale production of flexible thermoelectric modules.

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Section: Methodsmentioning

confidence: 99%

High-performance and compact-designed flexible thermoelectric modules enabled by a reticulate carbon nanotube architecture

et al. 2017

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“…The electric thermally conductivities of CNS will be smaller than 0.001 W m −1 K −1 assessed by the Wiedemann–Franz law, which has been proved reasonable for CNTs; therefore, the heat carried by electrons can be neglected, and the low k ⊥ in Figure A is contributed by mechanical vibrations in the air and CNTs. The k ⊥ is quite lower than k Air (0.026 W m −1 k −1 ), and also smaller than the k of CNT‐based TE materials, which is commonly larger than 0.4 W m −1 K −1 . Measurements carried out at high temperatures and Figure S2 also confirm that k ⊥ < k Air (Data S3).…”

mentioning

confidence: 84%

“…It is still very promising to further enhance the performance of the CNT composites. The three‐dimensional sponges synthesized by packing the CNTs or nanowires into bulk may have an even better TE performances …”

mentioning

confidence: 99%

“…The electric conductivities ( σ ⊥ and σ ∥ ) are tested using the four point probe method, as shown in Figure B. Because the σ ⊥ of CNS mainly depends on that of CNTs, there is no large difference between σ ⊥ of CNS and σ of CNT/polymer nanocomposites, which is about 250 to 280 S m −1 . The σ of CNTs along the axis direction is higher than that along the radial direction; therefore, the σ ⊥ of CNS is smaller than σ ∥ .…”

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confidence: 99%

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High cross‐plane thermoelectric performance of carbon nanotube sponge films

Huang

2019

Int J Energy Res

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Summary In this study, carbon nanotubes (CNTs) are packed to prepare CNT films with chemical‐vapor‐deposition method and vacuum filtration, then the films are piled up to make anisotropic three‐dimensional CNT sponges (CNS). This sponge is demonstrated to be a promising thermoelectric material. Its cross‐plane figure of merit (ZT⊥) is much larger than that along the in‐plane direction (ZT∥), and the maximum ZT⊥ is about 2.99 × 10−3 at 290 K. This high ZT⊥ is attributed to small thermal conductivity of CNS in ⊥ direction, because of small size of pores in CNS and the low k of CNTs along the radial direction.

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“…Although the superior thermoelectric properties of single‐crystalline 2D materials have been revealed, the performance of large‐area polycrystalline films should also be addressed because it is more important to build and integrate practical devices for IoT. Table 2 summarizes the reported room‐temperature power factor values for large‐area graphene, black phosphorus, and TMDC films fabricated by various scalable methods, and a comparison with commonly used flexible thermoelectric materials is also displayed . The power factors for large‐area samples are approximately one or two orders of magnitude smaller than the maximum values for single‐crystalline samples and commonly used carbon nanotubes and organic polymers.…”

Section: Summary Of the Thermoelectric Properties In 2d Materialsmentioning

confidence: 99%

2D Materials for Large‐Area Flexible Thermoelectric Devices

Kanahashi

Takenobu

2019

Advanced Energy Materials

162

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The rapid development of the concept of the “Internet of Things (IoT)” requires wearable devices with maintenance‐free batteries, and thermoelectric energy conversion based on large‐area flexible materials has attracted much attention. Among large‐area flexible materials, 2D materials, such as graphene and related materials, are promising for thermoelectric applications due to their excellent transport properties and large power factors. In this Review, both single‐crystalline and polycrystalline 2D materials are surveyed using the experimental reports on thermoelectric devices of graphene, black phosphorus, transition metal dichalcogenides, and other 2D materials. In particular, their carrier‐density dependent thermoelectric properties and power factors maximized by Fermi level tuning techniques are focused. The comparison of the relevant performances between 2D materials and commonly used thermoelectric materials reveals the significantly enhanced power factors in 2D materials. Moreover, the current progress in thermoelectric module applications using large‐area 2D material thin films is summarized, which consequently offers great potential for the use of 2D materials in large‐area flexible thermoelectric device applications. Finally, important remaining issues and future perspectives, such as preparation methods, thermal transports, device designs, and promising effects in 2D materials, are discussed.

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Ultrahigh‐Power‐Factor Carbon Nanotubes and an Ingenious Strategy for Thermoelectric Performance Evaluation

Cited by 78 publications

References 39 publications

High-performance and compact-designed flexible thermoelectric modules enabled by a reticulate carbon nanotube architecture

High-performance and compact-designed flexible thermoelectric modules enabled by a reticulate carbon nanotube architecture

High cross‐plane thermoelectric performance of carbon nanotube sponge films

2D Materials for Large‐Area Flexible Thermoelectric Devices

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