Numerical analysis of energy conversion efficiency and thermal reliability of novel, unileg segmented thermoelectric generation systems

Aljaghtham, Mutabe; Çelik, Emrah

doi:10.1002/er.6416

Cited by 21 publications

(6 citation statements)

References 52 publications

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“…The power was measured only for a small single leg, so that the result showed low power output at small ΔT (8K), which indicates a measurable power that can be obtained for ΔT above 8 K. The numerical simulation curves generated by ANSYS numerical model, a three-dimensional, 20-node coupling elements SOLID226 were selected to simulate the TE current and voltage, similar to the reference studies reported. [42][43][44][45] A single circular leg module with its dimensions was used for TE power calculations as shown in Figure 7F. Finally, it can be concluded that the numerical simulation curves are in good agreement with the experimental results.…”

Section: Power Generation Characteristicsmentioning

confidence: 60%

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

Salah

Alshahrie

Aljaghtham

et al. 2022

Adv Elect Materials

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highly efficient TE materials that possess a high electrical conductivity (σ), large Seebeck coefficient (S), and low thermal conductivity (κ) is very important. The values of these TE properties are ultimately affecting the value of the dimensionless parameter figure of merit ZT, which evaluates the efficiency of TE materials, and it is expressed as S 2 σT/κ, where T is the absolute temperature. [1] In the last 7-8 decades many materials have been developed and tested for the TE efficiency. In the 1950s, Bi 2 Te 3 was emerged as a promising inorganic TE material, [2] n-type Bi 2 Te 3-x Se x and p-type Bi 2-x Sb x Te 3 [3] were further found to show higher TE performance. Since then, a wide variety of materials, such as oxides, sulfides, silicides, selenides, skutterudites, intermetallic compounds, organic polymers, etc., have been proposed and investigated for TE applications. [4][5][6][7][8][9] Nanocarbon materials and their composites are also studied extensively in recent years. [10][11][12] Most of these materials, however, still demonstrate low TE efficiency at low temperature range of 200-400 K.A limited number of TE materials such as Cu 2 Se, [13] Ag 2 Se, [14] Bi 2 Te 3 nanostructures, [15,16] and Bi 0.5 Sb 1.5 Te 3 /PEDOT:PSS composite, [17] have been developed to be used near the room temperature (RT). Another work was also continued to develop TE materials with high ZT such as Mg 3 Sb 2 -based, which exhibits ZT near 1. [18] Although, these efforts were performed mainly for developing TE materials at RT, evolving more TE materials at RT are still in the early stages. Many reports have recently identified that copper iodide (CuI) is a promising material, which demonstrates good TE performance near RT. [19][20][21][22][23][24] The gamma phase (zinc blende structure) of CuI (denoted as γ-CuI) has a wide band gap (3.1 eV) with electron holes as charge carriers and it is classified as a flexible transparent p-type semiconductor. CuI is an environmentally friendly material due to its nontoxicity and naturally abundant elements, id est copper and iodine. In this material, iodine is a heavy element which leads to reduce the thermal conductivity and therefore enhances TE efficiency. The γ-CuI has been investigated for several applications, such as transparent electrode for solar cells, RT blue-emitting devices, vacuum fluorescent, and field emission displays. [19] Many researches have produced CuI in different forms including nanoparticles (NPs) and evaluated them for TE applications. [19][20][21][22][23][24] Recently, the effect of doping CuI NPs with several activators to enhance the TE performance has been reported. Some of the activators such as terbium (Tb) and iron (Fe) Thermoelectric (TE) materials are of great importance for harvesting thermal energy from waste or solar heat. One of the promising TE materials is copper iodide (CuI), which is nontoxic, earth-abundant, and has a high Seebeck coefficient at room temperature (RT). The TE performance of CuI nanoparticles (NPs) is found to be further enhance...

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Section: Power Generation Characteristicsmentioning

confidence: 60%

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

Salah

Alshahrie

Aljaghtham

et al. 2022

Adv Elect Materials

Self Cite

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“…The experimental results were also validated by generating numerical simulation curves ( Figure 5 a–f). These curves were generated by a three-dimensional ANSYS numerical model with 20 node coupling elements, SOLID226, selected to simulate the thermoelectric current and voltage, similar to the work reported in the literature [ 48 , 49 , 50 , 51 ]. More details about this model are described in the Supplementary Data .…”

Section: Resultsmentioning

confidence: 99%

High Thermoelectric Power Generation by SWCNT/PPy Core Shell Nanocomposites

et al. 2022

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Polypyrrole (PPy) is a conducting polymer with attractive thermoelectric (TE) properties. It is simple to fabricate and modify its morphology for enhanced electrical conductivity. However, such improvement is still limited to considerably enhancing TE performance. In this case, a single-wall carbon nanotube (SWCNT), which has ultrathin diameters and exhibits semi-metallic electrical conductivity, might be a proper candidate to be combined with PPy as a core shell one-dimensional (1D) nanocomposite for higher TE power generation. In this work, core shell nanocomposites based on SWCNT/PPy were fabricated. Various amounts of pyrrole (Py), which are monomer sources for PPy, were coated on SWCNT, along with methyl orange (MO) as a surfactant and ferric chloride as an initiator. The optimum value of Py for maximum TE performance was determined. The results showed that the SWCNT acted as a core template to direct the self-assembly of PPy and also to further enhance TE performance. The TE power factor, PF, and figure of merit, zT, values of the pure PPy were initially recorded as ~1 µW/mK2 and 0.0011, respectively. These values were greatly increased to 360 µW/mK2 and 0.09 for the optimized core shell nanocomposite sample. The TE power generation characteristics of the fabricated single-leg module of the optimized sample were also investigated and confirmed these findings. This enhancement was attributed to the uniform coating and good interaction between PPy polymer chains and walls of the SWCNT through π–π stacking. The significant enhancement in the TE performance of SWCNT/PPy nanocomposite is found to be superior compared to those reported in similar composites, which indicates that this nanocomposite is a suitable and scalable TE material for TE power generation.

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“…Thermoelectric performance can be characterized by the dimensionless thermoelectric figure‐of‐merit ZT , which is expressed as ZT = α 2 σ Τ /( κ L + κ c ), where α , σ , κ c , κ L , and T represent Seebeck coefficient, electrical conductivity, carrier thermal conductivity, lattice thermal conductivity, and absolute temperature, respectively [5] . ZT value largely determines the efficiency of power generation and thermoelectric refrigeration [5–8] . Therefore, increasing ZT is a key in thermoelectric materials research [3,9,10] …”

Section: Introductionmentioning

confidence: 99%

Effects of Bi Alloying on the Thermoelectric Properties of p‐Type Mg₃Sb_2‐xBi_x Solid Solutions

Zhu

et al. 2022

ChemNanoMat

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Bismuth is the most common alloying element for high-performance Mg 3 Sb 2 -based thermoelectric compounds. However, the electrical and thermal transport data is lacking for undoped Mg 3 (Sb, Bi) 2 solid solutions. In this study, theoretical calculation results show that Bi alloying can reduce the band gap of Mg 3 Sb 2 , favoring the regulation of carrier concentration. Both Mg 3 Sb 2 and Mg 3 SbBi compounds present a single band structure on the valence band maximum at Γ of the Brillouin zone. Incorporating the Bi element can slightly increase the density of states (DOS) on the valence band maximum, which is beneficial for the Seebeck coefficient. Mg 3 Sb 2-x Bi x (0 � x � 0.8) compounds were experimentally prepared via ball milling (BM) combined with the spark plasma sintering (SPS) technique. The carrier concentration, electrical conductivity, and power factor of the samples tend to increase with the increasing Bi content. Bismuth alloying significantly reduces the total thermal conductivity in the low-temperature range, with the lowest value of 0.65 Wm À 1 K À 1 obtained at ~400 K for the x = 0.2 sample. The peak ZT value of 0.077 at 800 K and the average ZT of 0.051 in the temperature range of 450-800 K are obtained for the x = 0.2 sample, which is 93% and 219% higher than those of the unalloyed sample, respectively. This work reveals the Bi-alloying induced transport mechanism and provides fundamental thermoelectric data regarding the undoped Mg 3 Sb 2-x Bi x (0 � x � 0.8) solid solutions.

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Numerical analysis of energy conversion efficiency and thermal reliability of novel, unileg segmented thermoelectric generation systems

Cited by 21 publications

References 52 publications

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

High Thermoelectric Power Generation by SWCNT/PPy Core Shell Nanocomposites

Effects of Bi Alloying on the Thermoelectric Properties of p‐Type Mg₃Sb_2‐xBi_x Solid Solutions

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Numerical analysis of energy conversion efficiency and thermal reliability of novel, unileg segmented thermoelectric generation systems

Cited by 21 publications

References 52 publications

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

High Thermoelectric Power Generation by SWCNT/PPy Core Shell Nanocomposites

Effects of Bi Alloying on the Thermoelectric Properties of p‐Type Mg3Sb2‐xBix Solid Solutions

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Effects of Bi Alloying on the Thermoelectric Properties of p‐Type Mg₃Sb_2‐xBi_x Solid Solutions