Green biopolymer-CNT films exhibit high thermoelectric power factor and electrical conductivity for low temperature heat energy harvesting

Wang, Yizhuo; Li, Kuncai; Wang, Jing; Dai, Xiaolin; Sun, Xu; Chong, Daotong; Yan, Junjie; Zhang, Liuyang; Wang, Hong

doi:10.1039/d2ta07670e

Cited by 11 publications

(9 citation statements)

References 62 publications

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“…Previous works also reported that the electrical conductivity increased with the decrease of porosity in CNTs films or their composite films after compressing. [16,[58][59][60][61][62][63] It was interesting to see that the Seebeck coefficient in the direction parallel to the winding direction (S ∥ ) decreased by only 12% (Figure 2e, from 73.3 to 64.4 μV K −1 ) although the 𝜎 ∥ raised dramatically by 17 times after the MWCNT films were compressed for 90 min. The maintained Seebeck coefficient of MWCNT films after compressing was mainly due to the unchanged chemical environment (unchanged doping level) of individual MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

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Densification Induced Decoupling of Electrical and Thermal Properties in Free‐Standing MWCNT Films for Ultrahigh p‐ and n‐Type Power Factors and Enhanced ZT

Li,

Sun,

Wang

et al. 2023

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Generating sufficient power from waste heat is one of the most important things for thermoelectric (TE) techniques in numerous practical applications. The output power density of an organic thermoelectric generator (OTEG) is proportional to the power factors (PFs) and the electrical conductivities of organic materials. However, it is still challenging to have high PFs over 1 mW m−1 K−2 in free‐standing films together with high electrical conductivities over 1000 S cm−1. Herein, densifying multi‐walled carbon nanotube (MWCNT) films would increase their electrical conductivity dramatically up to over 10 000 S cm−1 with maintained high Seebeck coefficients >60 µV K−1, thus leading to ultrahigh PFs of 7.25 and 4.34 mW m−1 K−2 for p‐ and n‐type MWCNT films, respectively. In addition, it is interesting to notice that the electrical properties increase faster than the thermal conductivities, resulting in enhanced ZT of 3.6 times in MWCNT films. An OTEG made of compressed MWCNT films is fabricated to demonstrate the heat‐to‐electricity conversion ability, which exhibits a high areal output power of ∼12 times higher than that made of pristine MWCNT films. This work demonstrates an effective way to high‐performance nanowire/nanoparticle‐based TE materials such as printable TE materials comprised of nanowires/nanoparticles.

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Section: Resultsmentioning

confidence: 99%

“…Previous works also reported that the electrical conductivity increased with the decrease of porosity in CNTs films or their composite films after compressing. [ 16,58–63 ]…”

Section: Resultsmentioning

confidence: 99%

Densification Induced Decoupling of Electrical and Thermal Properties in Free‐Standing MWCNT Films for Ultrahigh p‐ and n‐Type Power Factors and Enhanced ZT

Li,

Sun,

Wang

et al. 2023

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“…The ϕ P for the PEDOT:PSS/Ag and PE-DOT:PSS/BBL:PEI devices from this work are 4.8 × 10 −4 μW cm −2 K −2 and 6.4 × 10 −5 μW cm −2 K −2 , respectively, and fit among the highest reported values for polymer-based TEGs, [52][53][54] although recently reported carbon nanotube-based TEGs have eclipsed power densities of 0.75 μW cm −2 K −2 . [55,56] The thermocouple densities for PEDOT:PSS/Ag and PEDOT:PSS/BBL:PEI devices are 19480 and 1842 TCs cm −2 , respectively. Among organic TEGs, these values represent the highest thermocouple densities reported in literature by more than an order of magnitude.…”

Section: Comparison To the State Of The Artmentioning

confidence: 99%

A Rolled Organic Thermoelectric Generator with High Thermocouple Density

Pataki,

Zahabi,

et al. 2024

Adv Funct Materials

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The surge in the number of distributed microelectronics and sensors requires versatile, scalable, and affordable power sources. Heat‐harvesting organic thermoelectric generators (TEGs) are regarded as potential key components of the future energy landscape. Recent advances in the performance of organic thermoelectric materials have made practical applications of organic TEGs more feasible than ever before, yet the challenges of designing and fabricating organic TEGs suitable for real scenarios are scarcely addressed. Specifically, small sensors and wearables demand for micro‐thermoelectric generators (µTEGs) with high power density architectures and small form factors, while typical demonstrations of organic TEGs are characterized by < 10 thermocouples (TCs) per cm2. This work presents a rolled, organic µTEG architecture combining large‐area, solution‐based deposition techniques, such as inkjet and spray‐coating, and an ultrathin parylene substrate to achieve a thermocouple density of 1842 TCs cm−2. Such demonstrative µTEG reaches a thermoelectric conversion performance of 0.15 µW cm−2 at ΔT = 50 K. Such power output is well in line with finite element method simulations, which highlight the benefit of the architecture and show that remarkable power densities, in the mW cm−2 range at ΔT = 10 K, are realistically achievable with geometrical improvements and already ongoing advancements in organic thermoelectric inks.

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“…Efforts have been made to improve the performance of TE materials by decoupling the three key parameters. [37][38][39][40][41][42][43][44][45][46] Big progress has been achieved in inorganic TE materials in the past years. [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] He et al enhanced the ZT to 2.7 at 750 K in germanium telluride-based high-entropy materials and realized a high experimental conversion efficiency of 13.3% by highentropy concept tuning electron and phonon decoupling.…”

Section: Key Te Parameters Of 2d C-mofsmentioning

confidence: 99%

Recent advances of 2D conductive metal–organic frameworks in thermoelectrics

Li,

Wang,

Wang

2024

J. Mater. Chem. A

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Green biopolymer-CNT films exhibit high thermoelectric power factor and electrical conductivity for low temperature heat energy harvesting

Abstract: Exploring high performance flexible thermoelectric materials with biopolymer hybrids fulfills the concept of green energy produced by green materials. The power generation ability of a thermoelectric (TE) device is strongly...

Cited by 11 publications

References 62 publications

Densification Induced Decoupling of Electrical and Thermal Properties in Free‐Standing MWCNT Films for Ultrahigh p‐ and n‐Type Power Factors and Enhanced ZT

Densification Induced Decoupling of Electrical and Thermal Properties in Free‐Standing MWCNT Films for Ultrahigh p‐ and n‐Type Power Factors and Enhanced ZT

A Rolled Organic Thermoelectric Generator with High Thermocouple Density

Recent advances of 2D conductive metal–organic frameworks in thermoelectrics

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