Combination of PVA with Graphene to Improve the Seebeck Coefficient for Thermoelectric Generator Applications

Mahmoud, Lama; Samad, Yarjan Abdul; Alhawari, Mohammad; Mohammad, Baker; Liao, Kin; Ismail, Mohammed

doi:10.1007/s11664-014-3451-4

Cited by 16 publications

(12 citation statements)

References 12 publications

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“…Presumably, this effect could be attributed to the influence of PVOH on the existing thermoelectric properties of material. Previously, the same effect of the increase of Seebeck coefficient by ~30% was reported for graphene and sodium cobalt oxide nanoparticles after their introduction into the PVOH matrix [ 30 , 31 ]. However, the mechanism of the increase of Seebeck coefficient upon introduction of the material into PVOH is not clarified yet.…”

Section: Resultssupporting

confidence: 63%

Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler

et al. 2021

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This research is devoted to the fabrication of polyvinyl alcohol (PVOH) based n-type thermoelectric composites with innovative hybrid bismuth selenide-multiwalled carbon nanotube (Bi2Se3-MWCNT) fillers for application in flexible thermoelectric devices. Hybrid fillers were synthesized by direct deposition of Bi2Se3 on multiwalled carbon nanotubes using a physical vapor deposition method, thus ensuring direct electrical contact between the carbon nanotubes and Bi2Se3. The Seebeck coefficient of prepared PVOH/Bi2Se3-MWCNT composites was found to be comparable with that for the Bi2Se3 thin films, reaching −100 µV·K−1 for the composite with 30 wt.% filler, and fluctuations of the resistance of these composites did not exceed 1% during 100 repetitive bending cycles down to 10 mm radius, indicating the good mechanical durability of these composites and proving their high potential for application in flexible thermoelectrics. In addition, other properties of the fabricated composites that are important for the use of polymer-based materials such as thermal stability, storage modulus and linear coefficient of thermal expansion were found to be improved in comparison with the neat PVOH.

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Section: Resultssupporting

confidence: 63%

Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler

et al. 2021

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“…These points are illustrated in Table , which summarizes the Seebeck coefficient and the power output found in the few works available in the literature regarding PVA–inorganic thermoelectric printed films. Despite the results in the improvement of thermoelectric properties with the presence of PVA, − extensive studies are still needed to explore the full potential of PVA as an organic polymer in flexible thermoelectric systems. In particular, the synergetic combination of the inorganic Bi 2 Te 3 thermoelectric material and the easy production of doped-PVA should be explored.…”

Section: Introductionmentioning

confidence: 99%

Printed Flexible μ-Thermoelectric Device Based on Hybrid Bi₂Te₃/PVA Composites

Pires

Cruz

Silva

et al. 2019

ACS Appl. Mater. Interfaces

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Inorganic–polymer composites have become promising materials to be processed by printing technologies because of their unique properties that allow the fabrication of flexible wearable electronics at reduced manufacturing costs. In the present work, a complete methodological process of assembling a flexible microthermoelectric generator based on inorganic−polymer materials is presented. The used microparticles were prepared by a top-down approach beginning with a previously prepared material by solid-state reaction and later scaled down through the use of ball milling. It was found that the necessity to proceed with a chemical treatment with HCl to reduce Bi2O3 present on the surface of the microparticle leads to a power factor (PF) of 2.29 μW K–2 m–1, which is two times higher than that of the untreated sample. On the fabrication of flexible inorganic–organic thermoelectric thick films based on Bi2Te3 microparticles (<50 μm) and the poly(vinyl alcohol) (PVA) polymer with different thicknesses ranging from 11 to 265 μm and with different Bi2Te3 weight percentages (wt %), we found that PVA allowed achieving a homogeneous dispersion of the parent inorganic thermoelectric materials, while still maintaining their high performance. The best produced ink was obtained with 25 wt % of PVA and 75 wt % of chemically treated Bi2Te3 micropowder with a Seebeck coefficient of −166 μV K–1 and a PF of 0.04 μW K–2 m–1. For this optimized concentration, a flexible thermoelectric device was fabricated using n-type thermoelectric inks, which constitutes a major advantage to be applied in printing techniques because of their low curing temperature. The device architecture was composed of 10 stripes with 0.2 × 2.5 cm2 each in a one-leg configuration. This prototype yielded a power output up to ∼9 μW cm–2 with a 46 K temperature gradient (ΔT), and the results were combined with numerical simulations showing a good match between the experimental and the numerical results. The thermoelectric devices studied in this work offer easy fabrication, flexibility, and an attractive thermoelectric output for specific power requirements such as for environmental health monitoring.

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“…Recently, huge improvements of the Seebeck coefficient have been found by using other forms of carbon such as carbon nanotube and graphene [ 10 , 11 , 12 ]. However, these promising materials are not available in textile yarns which can be inserted into wearable textiles.…”

Section: Introductionmentioning

confidence: 99%

Seebeck Coefficient of Thermocouples from Nickel-Coated Carbon Fibers: Theory and Experiment

et al. 2018

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Thermocouples made of etched and non-etched nickel-coated carbon yarn (NiCCY) were investigated. Theoretic Seebeck coefficients were compared to experimental results from measurements of generated electric voltage by these thermocouples. The etching process for making thermocouples was performed by immersion of NiCCY in the solution containing a mixture of hydrochloric acid (HCl) (37% of concentration), and hydrogen peroxide (H2O2) in three different concentrations—3%, 6%, and 10%. Thirty minutes of etching to remove Ni from NiCCY was followed by washing and drying. Next, the ability to generate electrical voltage by the thermocouples (being a junction of the etched and the non-etched NiCCY) was measured in different ranges of temperatures, both a cold junction (291.15–293.15 K) and a hot junction (293.15–325.15 K). A formula predicting the Seebeck coefficient of this thermocouple was elaborated, taking into consideration resistance values of the tested samples. It was proven that there is a good agreement between the theoretical and experimental data, especially for the yarns etched with 6% and 10% peroxide (both were mixed with HCl). The electrical resistance of non-fully etched nickel remaining on the carbon fiber surface (R1) can have a significant effect on the thermocouples’ characteristics.

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Combination of PVA with Graphene to Improve the Seebeck Coefficient for Thermoelectric Generator Applications

Cited by 16 publications

References 12 publications

Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler

Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler

Printed Flexible μ-Thermoelectric Device Based on Hybrid Bi₂Te₃/PVA Composites

Seebeck Coefficient of Thermocouples from Nickel-Coated Carbon Fibers: Theory and Experiment

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Combination of PVA with Graphene to Improve the Seebeck Coefficient for Thermoelectric Generator Applications

Cited by 16 publications

References 12 publications

Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler

Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler

Printed Flexible μ-Thermoelectric Device Based on Hybrid Bi2Te3/PVA Composites

Seebeck Coefficient of Thermocouples from Nickel-Coated Carbon Fibers: Theory and Experiment

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Printed Flexible μ-Thermoelectric Device Based on Hybrid Bi₂Te₃/PVA Composites