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

Author

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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. Hyeongwook Im & Taewoo Kim & Hyelynn Song & Jongho Choi & Jae Sung Park & Raquel Ovalle-Robles & Hee Doo Yang & Kenneth D. Kihm & Ray H. Baughman & Hong H. Lee & Tae June Kang & Yong Hyup Kim, 2016. "High-efficiency electrochemical thermal energy harvester using carbon nanotube aerogel sheet electrodes," Nature Communications, Nature, vol. 7(1), pages 1-9, April.
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    3. 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.
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    6. 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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    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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