Enhanced thermoelectric performance of low carbon cement-based composites by reduced graphene oxide

Jian, Wei; Jia, Zhongzhi; Wang, Yuan; Jiang, Yichang; Miao, Zhuang; Zhou, Yuqi; Zhang, Hao

doi:10.1016/j.enbuild.2021.111279

Cited by 34 publications

(13 citation statements)

References 39 publications

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“…When the weight fraction of MnO 2 in the composite was 77.7%, the electrical conductivity of the PANI/MnO 2 composite reached a maximum value of 1.9 ± 0.03 S/cm. The obtained Seebeck coefficient and electrical conductivity of the materials in this work are similar to the composites from Wei, Sampad Ghosh, and some other researchers [44][45][46]. The Seebeck coefficient and electrical conductivity of those compacted composites with complex conductive "networks" inside are higher than those of the simple composite system, such as the unidirectional fibre-reinforced composites [47].…”

Section: Thermoelectric Properties Of Pani/mno2 Composite and Cement-...supporting

confidence: 82%

“…When the PANI/MnO 2 composite content was 5.0 wt.% of the cement, the electrical conductivity of the cement-matrix composites reached a maximum value of 0.015 ± 0.0003 S/cm, and the maximum Seebeck coefficient was −2.02 × 10 3 ± 40 µV/K. The obtained maximum Seebeck coefficient was higher than the reported values, such as −880 µV/K of cement composites with 1 wt.% expanded n-type nitrogen-doped CNTs, 746 µV/K of cement composites with 3 wt.% expanded graphite, 168.12 µV/K of cement composites with 1 wt.% reduced graphene oxide, and 36.3 µV/K of cement composites with 0.45 wt.% Bi 2 Te 3 [14,44,48,49]. It is mainly caused by the rod-shaped PANI/MnO 2 composite, acting as a one-dimensional nanostructured material.…”

Section: Thermoelectric Properties Of Pani/mno2 Composite and Cement-...contrasting

confidence: 59%

“…At this content, PANI covered 1.91% of the volume of the cement matrix, resulting in a good conductive network according to the classical percolation theory [40]. The obtained maximum electrical conductivity was 10,000 times that of plain cement paste, 80 times that of cement composites with 5.0 wt.% MnO 2 powder, and it was higher than the reported values, such as 0.0064 S/cm cement composites with 3 wt.% expanded graphite, 0.0027 S/cm of cement composites with 1 wt.% reduced graphene oxide, 0.0011 S/cm of cement composites with 0.45 wt.% Bi 2 Te 3 , and a bit lower than the cement composites with 1 wt.% expanded n-type nitrogen-doped CNTs (0.0195 S/cm) [14,44,48,49]. The thermoelectric effect of the cement-matrix composites with added PANI/MnO 2 composite was more remarkable than that of those cement composites with added CNTs, expanded graphite, reduced graphene oxide, or Bi 2 Te 3 .…”

Section: Thermoelectric Properties Of Pani/mno2 Composite and Cement-...mentioning

confidence: 99%

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Cement-Based Thermoelectric Device for Protection of Carbon Steel in Alkaline Chloride Solution

Liao

Zhang

et al. 2022

Materials

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The thermoelectric cement-based materials can convert heat into electricity; this makes them promising candidates for impressed current cathodic protection of carbon steel. However, attempts to use the thermoelectric cement-based materials for energy conversion usually results in low conversion efficiency, because of the low electrical conductivity and Seebeck coefficient. Herein, we deposited polyaniline on the surface of MnO2 and fabricated a cement-based thermoelectric device with added PANI/MnO2 composite for the protection of carbon steel in alkaline chloride solution. The nanorod structure (70~80 nm in diameter) and evenly dispersed conductive PANI provide the PANI/MnO2 composite with good electrical conductivity (1.9 ± 0.03 S/cm) and Seebeck coefficient (−7.71 × 103 ± 50 μV/K) and, thereby, increase the Seebeck coefficient of cement-based materials to −2.02 × 103 ± 40 μV/K and the electrical conductivity of cement-based materials to 0.015 ± 0.0003 S/cm. Based on this, the corrosion of the carbon steel was delayed after cathodic protection, which was demonstrated by the electrochemical experiment results, such as the increased resistance of the carbon steel surface from 5.16 × 102 Ω·cm2 to 5.14 × 104 Ω·cm2, increased charge transfer resistance from 11.4 kΩ·cm2 to 1.98 × 106 kΩ·cm2, and the decreased corrosion current density from 1.67 μA/cm2 to 0.32 μA/cm2, underlining the role of anti-corrosion of the PANI/MnO2 composite in the cathodic protection system.

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Section: Thermoelectric Properties Of Pani/mno2 Composite and Cement-...supporting

confidence: 82%

Section: Thermoelectric Properties Of Pani/mno2 Composite and Cement-...contrasting

confidence: 59%

Section: Thermoelectric Properties Of Pani/mno2 Composite and Cement-...mentioning

confidence: 99%

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Cement-Based Thermoelectric Device for Protection of Carbon Steel in Alkaline Chloride Solution

Liao

Zhang

et al. 2022

Materials

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“…Thermoelectric cementitious composites have even shown good thermoelectric properties as reported in recent years 104,105 . In particular, researchers in reducing the carbon content still maintain excellent thermoelectric properties for improving the mechanical properties of thermoelectric cement matrix 106,107 . However, the practical application of thermoelectric cementitious composites is still in the exploratory stage.…”

Section: Integrated Use Of Thermoelectric Technology In Pavement Ener...mentioning

confidence: 98%

“…104,105 In particular, researchers in reducing the carbon content still maintain excellent thermoelectric properties for improving the mechanical properties of thermoelectric cement matrix. 106,107 However, the practical application of thermoelectric cementitious composites is still in the exploratory stage. Although there are reports indicating that concrete structural surfaces have temperature gradients to the use the thermoelectric technology.…”

Section: Integrated Use Of Thermoelectric Technology In Pavement Ener...mentioning

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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Thermoelectric Power Factor of Boron‐Doped Carbon Nanotubes Reinforced Cementitious Composites

Wei,

Wang,

Hui

et al. 2023

Energy Tech

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In recent years, fossil fuel emissions and human activities have generated a lot of heat energy, causing environmental temperatures to rise. Thermoelectric cementitious composites that use temperature difference power generation to achieve the transformation of thermal and electrical energy can achieve a reduction in urban environmental temperature and alleviate resource depletion. However, the low thermoelectric conversion efficiency at this stage restricts its development. In this paper, boron‐doped carbon nanotubes (B‐CNTs) are proposed to improve the thermoelectric properties of cement materials by doping boron into carbon nanotubes through the thermal diffusion method. At H3BO3: CNTs = 1:4, the synthesized boron‐doped carbon nanotubes improved the Seebeck coefficient, which was mainly due to the increase in defect content and the appearance of additional phases around the Fermi energy level, leading to enhanced thermoelectric properties due to the increase in carrier scattering intensity. The thermoelectric optimum of the cement matrix composite with 7.0 wt% boron‐doped carbon nanotube content was 1.1×10‐4, which was three times higher than that of the undoped carbon nanotube. This paper provides a research idea to modify the thermoelectric properties of the material by doping the carbon material.This article is protected by copyright. All rights reserved.

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Enhanced thermoelectric performance of low carbon cement-based composites by reduced graphene oxide

Cited by 34 publications

References 39 publications

Cement-Based Thermoelectric Device for Protection of Carbon Steel in Alkaline Chloride Solution

Cement-Based Thermoelectric Device for Protection of Carbon Steel in Alkaline Chloride Solution

Recent advances in thermoelectric technology to harvest energy from the pavement

Thermoelectric Power Factor of Boron‐Doped Carbon Nanotubes Reinforced Cementitious Composites

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