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A Novel Thermocell System Using Proton Solvation Entropy
Author(s) -
Kobayashi Takashi,
Yamada Teppei,
Tadokoro Makoto,
Kimizuka Nobuo
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004562
Subject(s) - redox , solvation , chemistry , electron transfer , proton coupled electron transfer , proton , seebeck coefficient , electron , thermoelectric effect , thermodynamics , inorganic chemistry , physics , solvent , quantum mechanics , organic chemistry
The entropy change associated with proton‐coupled electron transfer (PCET) reactions significantly enhance the Seebeck coefficient ( S e ) of thermocells. A redox pair of [Ru(H x im) 6 ] 2+/3+ (Him=imidazole, x= 0≈1) releases three protons in their one‐electron redox reactions in thermocells, which gave a remarkably high S e of −3.7 mV K −1 as confirmed by temperature‐dependent square wave voltammetry. The value of S e is proportional to the redox reaction entropy (Δ S rc ), which increased with the number of dissociating protons. This result demonstrates the utility of PCET reaction toward efficient thermoelectric conversion.