State of the art in composition, fabrication, characterization, and modeling methods of cement-based thermoelectric materials for low-temperature applications

Liu, Xiaoli; Jani, Ruchita; Orisakwe, Esther; Johnston, Conrad; Chudziński, Piotr; Qu, Ming; Norton, Brian; Holmes, Niall; Kohanoff, Jorge; Stella, Lorenzo; Yin, Hongxi; Yazawa, Kazuaki

doi:10.1016/j.rser.2020.110361

Cited by 34 publications

(13 citation statements)

References 180 publications

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“…Since the probable application of the present cement-based TE technology is in structures, where high thermal gradients are typically rare, we purposefully picked a rather mild thermal gradient. The σ, S , and PF = 1.51 × 10 4 μWm –1 K –2 values reported here are the highest among carbonaceous cement-based composites …”

Section: Resultsmentioning

confidence: 54%

“…Since the probable application of the present cement-based TE technology is in structures where high thermal gradients are typically rare, we purposefully picked a rather mild thermal gradient (Δ T = 25 Κ) to test our thermoelectric generator. Comparing the thermoelectric values reported here with other p-type cement composites, it can be derived from Table that our work presents the highest values among carbonaceous cement-based composites …”

Section: Resultsmentioning

confidence: 58%

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Structural Carbon-Enhanced Cementitious Thermoelectric Generators (TEGs): Optimal Energy Filtering and TEG Design for Outstanding Energy Harvesting

Vareli,

Gkaravela,

Polyviou

et al. 2023

ACS Appl. Electron. Mater.

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We report on the development of a cementitious structural thermoelectric generator (TEG), exhibiting a significantly improved power density of 1.2 W/m 2 , via the optimization of the thermoelectric response of individual thermoelements and the TEG assembly. Toward this aim, we combined nano carbon black (nCB) and single-walled carbon nanotubes (SWCNTs) within the cementitious matrix to maximize the carrier-filtering effect for optimal thermoelectric efficiency. The multidimensional carbon nanomaterials self-assembled through electrostatic forces during the dispersion process in aqueous media and formed conductive networks inside the cement matrix at low filler contents. Simultaneously, the additional interfaces between the nCB and the SWCNT nano-reinforcement supported the selective scattering of low-energy carriers. Thus, cementitious thermoelements with significantly enhanced Seebeck coefficient were produced. To our knowledge, the Seebeck, S (+4644.2 μV/K), and power factor, PF (1.51 × 10 4 μW/mK 2 ), values attained in this study are the highest ever reported to date for nanoadditivebased cementitious thermoelectric nanocomposites. The optimal design of the proposed Hybrid TEG device (utilizing thermoelements with only SWCNTs and with SWCNTs/nCB reinforcement) resulted in a decrease of the internal electrical resistance of our cementitious thermoelectric generator, further optimizing its power output, which enabled, under a small ΔΤ of 25 K, the generation of enough power for the autonomous operation of microelectronic devices, like wireless sensors.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 58%

Structural Carbon-Enhanced Cementitious Thermoelectric Generators (TEGs): Optimal Energy Filtering and TEG Design for Outstanding Energy Harvesting

Vareli,

Gkaravela,

Polyviou

et al. 2023

ACS Appl. Electron. Mater.

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“…There are two common laboratory methods for preparing thermoelectric cementitious composites: the wet method (casting) and the dry method (compression). 69 The wet method is based on the traditional casting, adding additives, and thermoelectric materials to improve the preparation process. The wet preparation divides into four steps: dispersion, mixing, pouring, and molding.…”

Section: Thermoelectric Cementitious Compositesmentioning

confidence: 99%

Recent advances in thermoelectric technology to harvest energy from the pavement

Jian

Zhou

Wang

et al. 2022

Intl J of Energy Research

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Summary Reducing the excessive use of fossil fuels and developing new sustainable energy sources are challenges and urgent issues people face today. Pavements are rich in thermal energy when exposed to the sun for long periods of time. Thermoelectric technology allows for the conversion of thermal and electrical energy from the temperature difference that exists between the pavement and the underground. Thermoelectric technology applied to pavements could not only harvest energy to power wireless sensors, LED lights or store it in supercapacitors, but also absorb the temperature of the pavement to reduce damage to the pavement. The review summarized previous pavement thermoelectric energy harvesting systems in the areas of the types, advantages and disadvantages, power generation, and economic benefits. Methods to improve the conversion efficiency of thermoelectric energy harvesting devices are discussed in detail, especially the optimization of the cold end, the external environment, and the structure. Starting from the properties of thermoelectric cementitious composites, the applications and future developments of thermoelectric cementitious composites are presented in more detail. The thermoelectric cementitious composites are grouped into thermoelectric pavement energy harvesting solid systems. Finally, the integrated use of thermoelectric generator and thermoelectric cementitious composites for road energy harvesting is proposed. The article provided directions and references for future research on thermoelectric technology in pavement energy harvesting.

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“…While standard cement formulations show only a mild thermoelectric effect [14][15][16][17][18][19], the inclusion of additives such as carbon and steel fibres, inorganic compounds like graphite and/ or metallic oxides such as ZnO, Bi 2 O 3 or Fe 2 O 3 , or standard thermoelectric materials like Bi 2 Te 3 , can enhance the thermometric performance considerably. The challenges and opportunities presented by these composite materials have been discussed extensively in the recent literature , and been the objects of recent reviews [45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of cement composite analogues from first principles calculations

Orisakwe,

Johnston,

Jani

et al. 2023

Mater. Res. Express

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Buildings are responsible for a considerable fraction of the energy wasted globally every year, and as a result, excess carbon emissions. While heat is lost directly in colder months and climates, resulting in increased heating loads, in hot climates cooling and ventilation is required. One avenue towards improving the energy efficiency of buildings is to integrate thermoelectric devices and materials within the fabric of the building to exploit the temperature gradient between the inside and outside to do useful work. Cement-based materials are ubiquitous in modern buildings and present an interesting opportunity to be functionalised. We present a systematic investigation of the electronic transport coefficients relevant to the thermoelectric materials of the calcium silicate hydrate (C-S-H) gel analogue, tobermorite, using Density Functional Theory calculations with the Boltzmann transport method. The calculated values of the Seebeck coefficient are within the typical magnitude (200 - 600 µV/K) indicative of a good thermoelectric material. The tobermorite models are predicted to be intrinsically p-type thermoelectric material because of the presence of large concentration of the Si-O tetrahedra sites. The calculated electronic ZT for the tobermorite models have their optimal values of 0.983 at (400 K and 1017 cm-3) for tobermorite 9 Å, 0.985 at (400 K and 1017 cm-3) for tobermorite 11 Å and 1.20 at (225 K and 1019 cm-3) for tobermorite 14 Å, respectively.

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State of the art in composition, fabrication, characterization, and modeling methods of cement-based thermoelectric materials for low-temperature applications

Cited by 34 publications

References 180 publications

Structural Carbon-Enhanced Cementitious Thermoelectric Generators (TEGs): Optimal Energy Filtering and TEG Design for Outstanding Energy Harvesting

Structural Carbon-Enhanced Cementitious Thermoelectric Generators (TEGs): Optimal Energy Filtering and TEG Design for Outstanding Energy Harvesting

Recent advances in thermoelectric technology to harvest energy from the pavement

Thermoelectric properties of cement composite analogues from first principles calculations

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