Anisotropic Thermoelectric Performance and Sustainable Thermal Stability in Textured Ca3Co4O9/Ag Nanocomposites

Myung Eun Song, Heonjoong Lee, Min Gyu Kang, Wenjie Li, Deepam Maurya, Bed Poudel, Shashank Priya

Research output: Contribution to journalArticle

Abstract

The Ca3Co4O9 (CCO) with layered structure has been considered as a potential candidate for high-temperature thermal energy harvesting application. However, CCO's layered structure imparts anisotropy in transport properties, which results in anisotropic thermoelectric performance. So far, limited attempt has been made to understand the anisotropic thermoelectric performance of CCO, which often results in erroneous estimation of the thermoelectric response. Here, we fabricated highly textured CCO/x wt % Ag (x = 0, 1, 3, 5) nanoinclusion composites using the spark plasma sintering (SPS) technique and systematically investigated correlation between microstructure and anisotropic thermoelectric properties. The thermoelectric response was measured along both in-plane and out-of-plane directions (perpendicular and parallel to the pressure axis). We developed a two-step SPS method to achieve enhanced degree of texturing and increased electrical conductivity along ab-planes. The addition of Ag nanoinclusions was found to increase the overall electrical conductivity and thermoelectric power factor due to improved electrical connections among the grains. The peak ZT value for the CCO/3 wt % Ag composites, measured along both perpendicular and parallel directions, was found to be 0.14 and 0.06 at 640 °C, respectively. Almost the same values of resistivity, power factor, and ZT were maintained after repeated thermal cycling. These results reveal that CCO/3 wt % Ag composites have the desired thermal stability, which will make the thermoelectric module reliable for the intended period of operation.

Original languageEnglish (US)
Pages (from-to)4292-4301
Number of pages10
JournalACS Applied Energy Materials
Volume2
Issue number6
DOIs
StatePublished - Jun 24 2019

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Nanocomposites
Thermodynamic stability
Spark plasma sintering
Composite materials
Texturing
Energy harvesting
Thermoelectric power
Thermal cycling
Thermal energy
Transport properties
Anisotropy
Microstructure
Temperature
Electric Conductivity
Direction compound

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Chemical Engineering (miscellaneous)
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Anisotropic Thermoelectric Performance and Sustainable Thermal Stability in Textured Ca3Co4O9/Ag Nanocomposites",
abstract = "The Ca3Co4O9 (CCO) with layered structure has been considered as a potential candidate for high-temperature thermal energy harvesting application. However, CCO's layered structure imparts anisotropy in transport properties, which results in anisotropic thermoelectric performance. So far, limited attempt has been made to understand the anisotropic thermoelectric performance of CCO, which often results in erroneous estimation of the thermoelectric response. Here, we fabricated highly textured CCO/x wt {\%} Ag (x = 0, 1, 3, 5) nanoinclusion composites using the spark plasma sintering (SPS) technique and systematically investigated correlation between microstructure and anisotropic thermoelectric properties. The thermoelectric response was measured along both in-plane and out-of-plane directions (perpendicular and parallel to the pressure axis). We developed a two-step SPS method to achieve enhanced degree of texturing and increased electrical conductivity along ab-planes. The addition of Ag nanoinclusions was found to increase the overall electrical conductivity and thermoelectric power factor due to improved electrical connections among the grains. The peak ZT value for the CCO/3 wt {\%} Ag composites, measured along both perpendicular and parallel directions, was found to be 0.14 and 0.06 at 640 °C, respectively. Almost the same values of resistivity, power factor, and ZT were maintained after repeated thermal cycling. These results reveal that CCO/3 wt {\%} Ag composites have the desired thermal stability, which will make the thermoelectric module reliable for the intended period of operation.",
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Anisotropic Thermoelectric Performance and Sustainable Thermal Stability in Textured Ca3Co4O9/Ag Nanocomposites. / Song, Myung Eun; Lee, Heonjoong; Kang, Min Gyu; Li, Wenjie; Maurya, Deepam; Poudel, Bed; Priya, Shashank.

In: ACS Applied Energy Materials, Vol. 2, No. 6, 24.06.2019, p. 4292-4301.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Anisotropic Thermoelectric Performance and Sustainable Thermal Stability in Textured Ca3Co4O9/Ag Nanocomposites

AU - Song, Myung Eun

AU - Lee, Heonjoong

AU - Kang, Min Gyu

AU - Li, Wenjie

AU - Maurya, Deepam

AU - Poudel, Bed

AU - Priya, Shashank

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Y1 - 2019/6/24

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SN - 2574-0962

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