期刊
ELECTROCHIMICA ACTA
卷 335, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.135651
关键词
Thermoelectrochemical cell; Iron perchlorate; Redox couple; Seebeck coefficient; Hydration structure
资金
- Mid-Career Researcher Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [NRF-2017R1A2B4004470]
- National Research Foundation of Korea [2017R1A2B4004470] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Thermoelectrochemical cells (TECs) are promising devices for harvesting heat waste, but their widespread use has been hindered by their low thermopower densities. High-power TECs require an electrolyte solution that exhibits both high Seebeck coefficient (S-e) and high ionic conductivity; thus far, this has been a challenge. Recently, we demonstrated that proper selection of the counter anion of Fe(III)/(II) salts can resolve the aforementioned issue, that n-type (positive S-e) TECs employing the Fe(III)/(II) perchlorate redox couple display unprecedented high areal power densities compared to TECs employing Fe(III)/(II) chloride or Fe(III)/(II) sulfate couple. Herein, we unravel that the excellent performance of the Fe(III)/(II) perchlorate is ascribed to the non-coordinating nature of its perchlorate anion, which suppresses the formation of the ion pairs that reduce the S-e and ionic conductivity. UV-Vis and dielectric relaxation analysis revealed that the redox reaction of the hexa aquo complexes (Fe(H2O)(6)(3+/2+)), formed Fe(III)/(II) perchlorate, is accompanied by a hydration-number change larger than those of anion-coordinated species, which are dominant in chloride or sulfate media. In addition, p-type TECs can be combined in-series with p-type (negative S-e) TECs to provide output powers high enough for practical application. (C) 2020 Elsevier Ltd. All rights reserved.
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