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dc.contributor.authorKang, X.
dc.contributor.authorBørset, Marit Takla
dc.contributor.authorBurheim, Odne Stokke
dc.contributor.authorHaarberg, Geir Martin
dc.contributor.authorXu, Q.
dc.contributor.authorKjelstrup, Signe
dc.identifier.citationElectrochimica Acta. 2015, 182 342-350.nb_NO
dc.description.abstractWe report Seebeck coefficients of electrochemical cells with molten carbonate mixtures as electrolytes and carbon dioxide|oxygen electrodes. The system is relevant for use of waste heat and off-gases with concentration of carbon dioxide different from air, as for example in the metallurgical industry. The coefficient is −1.25 mV K−1 for a nearly equimolar mixture of lithium and sodium carbonate with dispersed magnesium oxide at 750 °C, one bar total pressure and a pressure ratio of carbon dioxide to oxygen of 2:1. The value is slightly lower when sodium is replaced by potassium. The theoretical expression of the Seebeck coefficient was established using the theory of non-equilibrium thermodynamics. We used this expression to predict an increase to −1.4 mV K−1 when lowering the gas partial pressures to 0.015 and 0.2 bar, respectively, for carbon dioxide and oxygen, a gas composition that can represent that of the off-gases from a silicon furnace which we are concerned with. The absolute value of the Seebeck coefficient increases by 0.2 mV K−1 when the cell average temperature increases from 550 to 850 °C. The presence of a second component in the electrolyte increases the coefficient significantly above the values obtained with one component, compatible with a lowering of the transported entropy of the carbonate ion. A concentration cell, using the off-gas from the silicon furnace as anode gas and air as cathode gas, will add 0.14 V at 550°C to the absolute value of the potential. The series construction has the potential to offer a power density at matched load conditions in the order of 0.5 kW m−2.nb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titleSeebeck coefficients of cells with molten carbonates relevant for the metallurgical industrynb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalElectrochimica Actanb_NO
dc.relation.projectHøgskolen i Sør-Trøndelag: 2224013nb_NO
dc.relation.projectNorges forskningsråd: 221672nb_NO
dc.description.localcode© 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (
cristin.unitnameInstitutt for kjemi
cristin.unitnameInstitutt for energi- og prosessteknikk
cristin.unitnameInstitutt for materialteknologi

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal