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Improved High Temperature Thermoelectric Properties in Misfit Ca 3 Co 4 O 9 by Thermal Annealing

Author

Listed:
  • Arindom Chatterjee

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain)

  • Alexandros El Sachat

    (Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15341 Athens, Greece)

  • Ananya Banik

    (New Chemistry Unit, School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 06484, India)

  • Kanishka Biswas

    (New Chemistry Unit, School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 06484, India)

  • Alejandro Castro-Alvarez

    (Laboratorio de Bioproductos Farmacéuticos y Cosméticos, Centro de Excelencia en Medicina Traslacional, Facultad de Medicina, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4780000, Chile)

  • Clivia M. Sotomayor Torres

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain
    ICREA—Catalan Institute for Research and Advanced Studies, 08010 Barcelona, Spain)

  • José Santiso

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain)

  • Emigdio Chávez-Ángel

    (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain)

Abstract

Ca 3 Co 4 O 9 , a p-type thermoelectric material based on transition-metal oxides, has garnered significant interest due to its potential in thermoelectric applications. Its unique misfit-layered crystal structure contributes to low thermal conductivity and a high Seebeck coefficient, leading to a thermoelectric figure of merit (zT) of ≥1 at 1000 K. Conventionally, it has been believed that thermopower reaches its upper limit above 200 K. However, our thermopower measurements on polycrystalline Ca 3 Co 4 O 9 samples have revealed an unexpected increase in thermopower above 380 K. In this study, we investigate the effects of high oxygen pressure annealing on Ca 3 Co 4 O 9 and provide an explanation based on the mixed oxide states of cobalt and carrier hopping. Our results demonstrate that annealing induces modifications in the defect chemistry of Ca 3 Co 4 O 9 , leading to a decrease in electron hopping probability and the emergence of a thermal activation-like behavior in thermopower. These findings carry significant implications for the design and optimization of thermoelectric materials based on misfit cobaltates, opening new avenues for enhanced thermoelectric performance.

Suggested Citation

  • Arindom Chatterjee & Alexandros El Sachat & Ananya Banik & Kanishka Biswas & Alejandro Castro-Alvarez & Clivia M. Sotomayor Torres & José Santiso & Emigdio Chávez-Ángel, 2023. "Improved High Temperature Thermoelectric Properties in Misfit Ca 3 Co 4 O 9 by Thermal Annealing," Energies, MDPI, vol. 16(13), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:5162-:d:1186850
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    References listed on IDEAS

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    1. Yayu Wang & Nyrissa S. Rogado & R. J. Cava & N. P. Ong, 2003. "Spin entropy as the likely source of enhanced thermopower in NaxCo2O4," Nature, Nature, vol. 423(6938), pages 425-428, May.
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