dc.contributor.author | Kang, X. | |
dc.contributor.author | Børset, Marit Takla | |
dc.contributor.author | Burheim, Odne Stokke | |
dc.contributor.author | Haarberg, Geir Martin | |
dc.contributor.author | Xu, Q. | |
dc.contributor.author | Kjelstrup, Signe | |
dc.date.accessioned | 2017-10-27T06:44:25Z | |
dc.date.available | 2017-10-27T06:44:25Z | |
dc.date.created | 2015-10-19T12:55:37Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Electrochimica Acta. 2015, 182 342-350. | nb_NO |
dc.identifier.issn | 0013-4686 | |
dc.identifier.uri | http://hdl.handle.net/11250/2462477 | |
dc.description.abstract | We 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.language.iso | eng | nb_NO |
dc.publisher | Elsevier | nb_NO |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no | * |
dc.title | Seebeck coefficients of cells with molten carbonates relevant for the metallurgical industry | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | publishedVersion | nb_NO |
dc.source.pagenumber | 342-350 | nb_NO |
dc.source.volume | 182 | nb_NO |
dc.source.journal | Electrochimica Acta | nb_NO |
dc.identifier.doi | 10.1016/j.electacta.2015.09.059 | |
dc.identifier.cristin | 1281594 | |
dc.relation.project | Høgskolen i Sør-Trøndelag: 2224013 | nb_NO |
dc.relation.project | Norges forskningsråd: 221672 | nb_NO |
dc.description.localcode | © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). | nb_NO |
cristin.unitcode | 194,66,25,0 | |
cristin.unitcode | 194,64,25,0 | |
cristin.unitcode | 194,66,35,0 | |
cristin.unitname | Institutt for kjemi | |
cristin.unitname | Institutt for energi- og prosessteknikk | |
cristin.unitname | Institutt for materialteknologi | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |