Fabrication and Testing of a Tubular Thermoelectric Module Based on Oxide Elements

Merkulov, O.V.; Politov, B.V.; Chesnokov, K. Yu.; Markov, A.A.; Леонидов, И. А.; Патракеев, М.В.

doi:10.1007/s11664-018-6150-8

Cited by 14 publications

(19 citation statements)

References 54 publications

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“…With the discovery of attractive TE properties in Na x CoO 2 ceramics in 1997 [15], a lot of effort has been put in the research and development of CoO-based materials, as well as other transition metal oxides [16], which have important 'default' advantages (abundance, low-cost, environmental 'friendliness', low reactivity and high thermochemical stability) over established TE materials, enabling them to be considered for power generation applications at high temperatures and in oxidizing conditions [17][18][19][20][21]. While the best performing n-type TE oxides were found in the family of perovskite-type titanates [22][23][24][25], manganites [26][27][28][29] and ZnO-based materials [30][31][32], one of the most promising p-type TE materials (considered as the best choice for a p-type leg in a high-temperature TE module) continues to be the so-called Ca 3 Co 4 O 9 compound, belonging to the family of misfit-layered cobaltites [26].…”

Section: Introductionmentioning

confidence: 99%

Redox-Promoted Tailoring of the High-Temperature Electrical Performance in Ca3Co4O9 Thermoelectric Materials by Metallic Cobalt Addition

et al. 2020

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This paper reports a novel composite-based processing route for improving the electrical performance of Ca3Co4O9 thermoelectric (TE) ceramics. The approach involves the addition of metallic Co, acting as a pore filler on oxidation, and considers two simple sintering schemes. The (1-x)Ca3Co4O9/xCo composites (x = 0%, 3%, 6% and 9% vol.) have been prepared through a modified Pechini method, followed by one- and two-stage sintering, to produce low-density (one-stage, 1ST) and high-density (two-stage, 2ST) ceramic samples. Their high-temperature TE properties, namely the electrical conductivity (σ), Seebeck coefficient (α) and power factor (PF), were investigated between 475 and 975 K, in air flow, and related to their respective phase composition, morphology and microstructure. For the 1ST case, the porous samples (56%–61% of ρth) reached maximum PF values of around 210 and 140 μWm−1·K−2 for the 3% and 6% vol. Co-added samples, respectively, being around two and 1.3 times higher than those of the pure Ca3Co4O9 matrix. Although 2ST sintering resulted in rather dense samples (80% of ρth), the efficiency of the proposed approach, in this case, was limited by the complex phase composition of the corresponding ceramics, impeding the electronic transport and resulting in an electrical performance below that measured for the Ca3Co4O9 matrix (224 μWm−1·K−2 at 975K).

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Section: Introductionmentioning

confidence: 99%

Redox-Promoted Tailoring of the High-Temperature Electrical Performance in Ca3Co4O9 Thermoelectric Materials by Metallic Cobalt Addition

et al. 2020

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“…Although the cold side temperature did not remain at room temperature, the temperature difference thus created, that is, 400-800 K was optimal for the current 3D-printed TE materials according to their temperature-dependent TE properties. As the temperature difference increased, the output voltage increased [13,[46][47][48][49][50] almost linearly and output power increased quadratically, achieving a maximum output voltage of 83.2 mV and power of 216.3 mW at a temperature difference of 300 K (Figure 4e, Figure S23, Supporting Information). Furthermore, the maximum power density of 153.7 mW cm -2 was significantly larger than those of reported tubular TEGs (Figure 4f).…”

Section: D Printing Of Power-generating Te Tubesmentioning

confidence: 99%

Doping‐Induced Viscoelasticity in PbTe Thermoelectric Inks for 3D Printing of Power‐Generating Tubes

Lee

Choo

et al. 2021

Advanced Energy Materials

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Thermoelectric (TE) technologies offer promising means to enhance fossil energy efficiencies by generating electricity from waste heat from industrial or automobile exhaust gases. For these applications, thermoelectric modules should be designed from the perspective of system integration for efficient heat transfer, system simplification, and low processing cost. However, typical thermoelectric modules manufactured by traditional processes do not fulfil such requirements, especially for exhaust pipes. Hence, a 3D‐printing method for PbTe thermoelectric materials is reported to design high‐performance power‐generating TE tubes. The electronic doping‐induced surface charges in PbTe particles are shown to significantly improve the viscoelasticities of inks without additives, thereby enabling precise shape and dimension engineering of 3D bulk PbTe with figures of merit of 1.4 for p‐type and 1.2 for n‐type materials. The performance of the power‐generating TE tube fabricated from 3D‐printed PbTe tubes is demonstrated experimentally and computationally as an effective strategy to design system‐adaptive high‐performance thermoelectric generators.

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“…Much work has been devoted to developing the Bi 2 Te 3 -based module [20,23,24,28], which is capable of generating power efficiently at room temperature. Although there are several works that fabricated tubular modules with higher operating temperatures, power density is not so high [22,37]. Our SKD module takes advantage of both the temperature range and power output while preserving the curved morphology of the whole device.…”

Section: Measurement and Estimation Of The Output Characteristicmentioning

confidence: 99%

“…Ring-type TEGs, or tubular TEGs, have been designed as alternatives to deal with the aforementioned challenges and to achieve high efficiency via conformal contact to the heat source [22,23]. Nonetheless, most of the studies in terms of tubular TEG limit their material to the bismuth telluride (Bi 2 Te 3 ), which is for low-temperature power generation [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Skutterudite-Based Tubular Thermoelectric Generator

et al. 2020

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The conversion efficiency of the thermoelectric generator (TEG) is adversely affected by the quality of thermal contact between the module and the heat source. TEGs with the planar substrate are not suitable for the curved heat sources. Several attempts have been made to tackle this issue by fabricating complex tubular-shaped TEGs; however, all efforts have been limited to low-temperature applications. Furthermore, the electrical contact resistance of the module is critical to achieving a high-power output. In this work, we developed the tubular TEG with significantly low specific contact resistance by optimizing the joining process. We show that the modified resistance welding (MRW) performed by spark plasma sintering (SPS) is an efficient joining method for the fabrication of the TE module, with high feasibility and scalability. This research seeks to suggest important design rules to consider when fabricating TEGs.

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Fabrication and Testing of a Tubular Thermoelectric Module Based on Oxide Elements

Cited by 14 publications

References 54 publications

Redox-Promoted Tailoring of the High-Temperature Electrical Performance in Ca3Co4O9 Thermoelectric Materials by Metallic Cobalt Addition

Redox-Promoted Tailoring of the High-Temperature Electrical Performance in Ca3Co4O9 Thermoelectric Materials by Metallic Cobalt Addition

Doping‐Induced Viscoelasticity in PbTe Thermoelectric Inks for 3D Printing of Power‐Generating Tubes

Fabrication of Skutterudite-Based Tubular Thermoelectric Generator

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