Organic Thermoelectric Textiles for Harvesting Thermal Energy and Powering Electronics

Chongan Di; Kun Zhang; Qihao Zhang; Qinye Bao; Shiren Wang; Wenlong Jin; Xinhou Wang; Xinyi Chen; Xue Han; Yanping Liu

arxiv: 1907.04883 · v1 · pith:3OZUMRCHnew · submitted 2019-07-10 · ⚛️ physics.app-ph

Organic Thermoelectric Textiles for Harvesting Thermal Energy and Powering Electronics

Yuanyuan Zheng , Qihao Zhang , Wenlong Jin , Yuanyuan Jing , Xinyi Chen , Xue Han , Qinye Bao , Yanping Liu

show 5 more authors

Xinhou Wang Shiren Wang Yiping Qiu Kun Zhang Chongan Di

This is my paper

Pith reviewed 2026-05-24 23:07 UTC · model grok-4.3

classification ⚛️ physics.app-ph

keywords thermoelectric textileswearable power generationcarbon nanotube yarnspacer fabricbody heat harvestingpower densityon-body electronics

0 comments

The pith

Knitted carbon nanotube yarns in spacer fabrics generate 51.5 mW/m² from body heat differences while staying wearable.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes a scalable knitting method to turn segmented carbon nanotube yarns into three-dimensional spacer fabric thermoelectric textiles. Finite element analysis combined with experiments shows that the fabric geometry controls the temperature gradient and power output. Optimized versions reach 51.5 mW per square meter and 173.3 microwatts per gram per kelvin at a 47.5 kelvin difference, and they directly run small electronics on the body. This approach keeps the material flexible, stable, and suitable for clothing integration.

Core claim

Knitting carbon nanotube yarn based segmented thermoelectric yarn into organic spacer fabric produces three-dimensional thermoelectric textiles whose power generation depends on fabric structure; the best designs deliver 51.5 mW/m² power density and 173.3 μW/(g·K) specific power at ΔT = 47.5 K and can continuously power on-body healthcare and environmental monitoring devices.

What carries the argument

The spacer fabric structure formed by knitting segmented thermoelectric yarns, whose geometry is tuned via finite element analysis to maintain temperature gradients across the out-of-plane direction.

If this is right

Large-scale production of flexible thermoelectric generators becomes feasible without losing performance.
Body-heat differences can supply continuous power to sensors and small electronics without batteries.
The textiles remain conformable enough to be incorporated into regular clothing.
Stability under wear allows repeated use for monitoring applications.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same knitting route could be tested with other thermoelectric yarns to raise the temperature tolerance or efficiency.
Combining the textiles with small capacitors might buffer output when body movement changes the temperature gradient.
Real-world trials on moving subjects would show how much the reported numbers hold up under dynamic conditions.

Load-bearing premise

The fabric structure created by the knitting process itself is what drives the measured power output and that this structure and performance survive large-scale production and everyday use.

What would settle it

Measure the power output of the knitted spacer-fabric TET against an otherwise identical flat or differently patterned arrangement of the same yarns at the same temperature difference; a large drop would falsify the claim that structure is decisive.

read the original abstract

Wearable thermoelectric devices show promises to generate electricity in a ubiquitous, unintermittent and noiseless way for on-body applications. Three-dimensional thermoelectric textiles (TETs) outperform other types in smart textiles owing to their out-of-plane thermoelectric generation and good structural conformability with fabrics. Yet, there has been lack of efficient strategies in scalable manufacture of TETs for sustainably powering electronics. Here, we fabricate organic spacer fabric shaped TETs by knitting carbon nanotube yarn based segmented thermoelectric yarn in large scale. Combing finite element analysis with experimental evaluation, we elucidate that the fabric structure significantly influences the power generation. The optimally designed TET with good wearability and stability shows high output power density of 51.5 mW/m2 and high specific power of 173.3 uW/(g.K) at delta T= 47.5 K. The promising on-body applications of the TET in directly and continuously powering electronics for healthcare and environmental monitoring is fully demonstrated. This work will broaden the research vision and provide new routines for developing high-performance and large-scale TETs toward practical applications.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

The paper gives a workable knitting route for CNT-yarn thermoelectric spacer fabrics and reports 51.5 mW/m² power density, but the FEA-experiment link for structure optimization lacks the validation details needed to trust the design claims.

read the letter

The main point is a fabrication method that knits segmented CNT yarns into large organic spacer fabrics to make out-of-plane thermoelectric textiles, with measured output of 51.5 mW/m² and 173.3 µW/(g·K) at 47.5 K delta T, plus a demo of powering small devices on body. That combination of scale, conformability, and numbers is the concrete advance here. The work shows the knitting process can be done at larger sizes while keeping thermoelectric function and some stability under wear. They also use FEA to explore how fabric geometry changes heat flow and power, then pick an optimized layout that matches their experiments. This is useful for anyone trying to move from lab patches to fabric-scale harvesters. The soft spot is the thin support for the central claim that structure matters a lot. The abstract gives the final numbers but no error bars, no raw traces, no yarn property measurements, and no clear account of how the FEA handled contact resistance or effective conductivity. If those inputs are off, the predicted optimum and the attributed performance gain do not transfer. The stress-test note on model validation is the right place to press. No circularity or invented entities, just standard experimental reporting with one under-documented step. This paper is for groups working on wearable energy textiles who need fabrication recipes more than new theory. A reader who wants to try knitting their own devices could extract the process steps and try to reproduce the numbers. It is coherent enough on its own terms to go to referees rather than desk reject, though the methods and FEA sections will need expansion before acceptance.

Referee Report

3 major / 1 minor

Summary. The paper claims to fabricate scalable three-dimensional organic thermoelectric textiles (TETs) by knitting carbon nanotube yarn into spacer fabric structures. Combining finite element analysis (FEA) with experiments, it reports that fabric structure significantly influences out-of-plane power generation, with an optimally designed TET achieving 51.5 mW/m² power density and 173.3 µW/(g·K) specific power at ΔT = 47.5 K, plus demonstrations of on-body powering of electronics.

Significance. If substantiated, the work would be significant for enabling large-scale production of wearable thermoelectric devices via knitting, addressing a key barrier to practical on-body energy harvesting for healthcare and monitoring applications. The FEA-guided structural optimization and emphasis on wearability/stability represent methodological strengths.

major comments (3)

[Abstract/Results] Abstract and Results: The reported performance numbers (51.5 mW/m² and 173.3 µW/(g·K)) lack error bars, raw data, replicate counts, or measurement protocols, which is load-bearing for the central claim that the optimally designed TET delivers high output and that structure influences generation.
[Finite Element Analysis] FEA section: The claim that FEA combined with experiments shows fabric structure significantly influences generation rests on model-experiment agreement, but the manuscript provides no details on how contact resistances between yarns, effective thermal conductivity of CNT segments, or out-of-plane heat flow boundary conditions are implemented or validated; without this the predicted optimum cannot be assessed for transferability.
[Methods] Methods/Experimental: No information is given on the number of samples, variability across knitted devices, or quantitative stability/wearability tests, undermining support for the claims of large-scale manufacture while preserving performance.

minor comments (1)

[Abstract] Abstract: The final sentence contains a grammatical error ('applications ... is fully demonstrated').

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their detailed and constructive comments on our manuscript. We have carefully considered each point and provide point-by-point responses below. We will make revisions to incorporate additional details and data as outlined.

read point-by-point responses

Referee: [Abstract/Results] Abstract and Results: The reported performance numbers (51.5 mW/m² and 173.3 µW/(g·K)) lack error bars, raw data, replicate counts, or measurement protocols, which is load-bearing for the central claim that the optimally designed TET delivers high output and that structure influences generation.

Authors: We agree that the presentation of performance metrics requires additional supporting information to fully substantiate the claims. In the revised version, we will add error bars to the reported values based on measurements from multiple samples (n ≥ 3), include a description of the measurement protocols in the Methods section, and provide raw data and replicate counts in the supplementary materials. This will clarify the variability and reliability of the results. revision: yes
Referee: [Finite Element Analysis] FEA section: The claim that FEA combined with experiments shows fabric structure significantly influences generation rests on model-experiment agreement, but the manuscript provides no details on how contact resistances between yarns, effective thermal conductivity of CNT segments, or out-of-plane heat flow boundary conditions are implemented or validated; without this the predicted optimum cannot be assessed for transferability.

Authors: We recognize that more comprehensive details on the FEA implementation are needed. The revised manuscript will include an expanded description of the model: contact resistances were incorporated as thermal and electrical boundary conditions calibrated using experimental data from yarn junctions; the effective thermal conductivity of the CNT yarn segments was derived from independent measurements; out-of-plane heat flow was modeled with Dirichlet boundary conditions matching the experimental temperature differences. We will also present additional validation plots comparing FEA predictions to experimental results for various fabric structures to demonstrate the model's reliability. revision: yes
Referee: [Methods] Methods/Experimental: No information is given on the number of samples, variability across knitted devices, or quantitative stability/wearability tests, undermining support for the claims of large-scale manufacture while preserving performance.

Authors: We concur that details on sample replication and quantitative assessments of stability and wearability are essential. In the revision, we will specify the number of samples tested (typically 5 per configuration), report variability as standard deviations, and add quantitative data on stability (e.g., performance retention after 500 bending cycles and washing tests) and wearability (e.g., comfort and durability assessments). These experiments were conducted and support the claims of scalability and robustness. revision: yes

Circularity Check

0 steps flagged

No circularity; claims rest on fabrication, FEA modeling, and direct measurements.

full rationale

The paper fabricates segmented CNT-yarn thermoelectric textiles via knitting, applies finite element analysis to explore structure effects on heat flow and power, then reports measured output power density and specific power on the physical devices at a stated ΔT. No equations or results are shown to reduce to self-definition, fitted parameters renamed as predictions, or load-bearing self-citations. The central numbers (51.5 mW/m², 173.3 µW/(g·K)) are presented as experimental outcomes on the optimized knitted samples, with FEA used only for design insight rather than as the source of the quoted performance values. This is the normal case of an experimental materials paper whose derivation chain is externally falsifiable via replication of the fabrication and testing protocol.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Experimental device-fabrication paper; abstract describes no mathematical derivations, fitted parameters, axioms, or new postulated entities. Performance values are presented as measured outcomes.

pith-pipeline@v0.9.0 · 5761 in / 1118 out tokens · 27851 ms · 2026-05-24T23:07:03.518239+00:00 · methodology

discussion (0)

Reference graph

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The density of the CNT yarn is assumed to be 1.2 g/cm3

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Figure 6 | Demonstrating scalable manufacture of weft-knitted spacer fabric based TETs

Overall, this section signifies the scalable manufacturing of TET using conventional industrial textile process. Figure 6 | Demonstrating scalable manufacture of weft-knitted spacer fabric based TETs. a. Illustration of industrial weft-knitting process with a computerized flat knitting machine. The twisted core yarn comprised of TEYs with polyester filame...

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Wang, L. et al. Application challenges in fiber and textile electronics. Adv. Mater . (Deerfield Beach, Fla.), e1901971-e1901971 (2019)

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Shi, J. et al. Smart textile-integrated microelectronic systems for wearable applications. Adv. Mater (Deerfield Beach, Fla.), e1901958-e1901958 (2019)

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Zhang, M. et al. A hybrid fibers based wearable fabric piezoelectric nanogenerator for energy harvesting application. Nano Energy 13, 298-305 (2015)

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Lee, M. et al. A hybrid piezoelectric structure for wearable nanogenerators. Adv. Mater . 24, 1759-1764 (2012)

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Zhou, Y . et al. A universal method to produce low-work function electrodes for organic electronics. Science 336, 327-332 (2012). Author Contributions K.Z. conceived the idea, designed the experiment. K.Z. and C.D. guided the project. Y. Z. performed fabric modeling. Y . Z and Q. Z. performed finite element simulation and data analysis. Y .Z. prepared all...

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The diameter of the CNT yarn is 40 µm. The density of the CNT yarn is assumed to be 1.2 g/cm3. So the total weight of the TE material is about π×(2×10-3)2×8.38×1.2=1.3×10-4 g. Supplementary References 1 Sun, Y uanhui , et al. Flexible n-Type High-Performance Thermoelectric Thin Films of Poly(nickel-ethylenetetrathiolate) Prepared by an Electrochemical Met...

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