A Novel Thermocell System Using Proton Solvation Entropy
Takashi Kobayashi, Teppei Yamada, Makoto Tadokoro, Nobuo Kimizuka
Abstract
Abstract 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.
Topics & Concepts
RedoxSolvationChemistryElectron transferProton-coupled electron transferProtonSeebeck coefficientElectronEntropy (arrow of time)Physical chemistryThermoelectric effectThermodynamicsInorganic chemistrySolventPhysicsQuantum mechanicsOrganic chemistryAdvanced battery technologies researchElectrochemical Analysis and ApplicationsElectrocatalysts for Energy Conversion