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Hybrid thermo-electrochemical energy harvesters for conversion of low-grade thermal energy into electricity via tungsten electrodes

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  • Jung, Sang-Mun
  • Kwon, Jaesub
  • Lee, Jinhyeon
  • Lee, Byung-Jo
  • Kim, Kyu-Su
  • Yu, Dong-Seok
  • Kim, Yong-Tae

Abstract

Thermo-electrochemical cells utilizing aqueous hexacyanoferrate electrolytes are recognized as an effective energy harvesting system for low-grade waste heat (≤170 °C) owing to their high stability and simple design. Nevertheless, the power generation of thermo-electrochemical cells is low due to the Seebeck coefficient of hexacyanoferrate electrolyte. Herein, we propose hybrid thermo-electrochemical cells using tungsten electrodes, exploiting the redox reaction of hexacyanoferrate and oxidation of the tungsten electrode. Enhanced Seebeck coefficient was attributed to the combination of the two reactions: the redox reaction of the electrolyte and oxidation reaction of tungsten electrodes. The developed tungsten electrode-based hybrid thermo-electrochemical cells generated a Seebeck coefficient of 1.66 mV K−1 and 425 mW m−2 at a dT of 50 °C, ~ 70% higher the power output of platinum and carbon electrodes. From an economic viewpoint, the cost of tungsten makes up for its inevitable consumption due to dissolution and the cost of periodic electrode replacement. Our system is an innovative solution, which might contribute to the commercialization of thermo-electrochemical cells.

Suggested Citation

  • Jung, Sang-Mun & Kwon, Jaesub & Lee, Jinhyeon & Lee, Byung-Jo & Kim, Kyu-Su & Yu, Dong-Seok & Kim, Yong-Tae, 2021. "Hybrid thermo-electrochemical energy harvesters for conversion of low-grade thermal energy into electricity via tungsten electrodes," Applied Energy, Elsevier, vol. 299(C).
    • Handle: RePEc:eee:appene:v:299:y:2021:i:c:s030626192100742x
    DOI: 10.1016/j.apenergy.2021.117334
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    References listed on IDEAS

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    1. Ebrahimi, Khosrow & Jones, Gerard F. & Fleischer, Amy S., 2014. "A review of data center cooling technology, operating conditions and the corresponding low-grade waste heat recovery opportunities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 622-638.
    2. Jiangjiang Duan & Guang Feng & Boyang Yu & Jia Li & Ming Chen & Peihua Yang & Jiamao Feng & Kang Liu & Jun Zhou, 2018. "Aqueous thermogalvanic cells with a high Seebeck coefficient for low-grade heat harvest," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    3. Imran, Muhammad & Usman, Muhammad & Park, Byung-Sik & Lee, Dong-Hyun, 2016. "Volumetric expanders for low grade heat and waste heat recovery applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 1090-1109.
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    5. Seok Woo Lee & Yuan Yang & Hyun-Wook Lee & Hadi Ghasemi & Daniel Kraemer & Gang Chen & Yi Cui, 2014. "An electrochemical system for efficiently harvesting low-grade heat energy," Nature Communications, Nature, vol. 5(1), pages 1-6, September.
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    Cited by:

    1. Yu, Chengbin & Park, Juhyuk & Ryoun Youn, Jae & Seok Song, Young, 2022. "Integration of form-stable phase change material into pyroelectric energy harvesting system," Applied Energy, Elsevier, vol. 307(C).

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