Mathematical modelling of the MCFC cathode: On the linear polarisation of the NiO cathode
1997 (English)In: Journal of Electroanalytical Chemistry, ISSN 0022-0728, Vol. 432, no 1-2, 121-128 p.Article in journal (Refereed) Published
Experimental polarisation curves for the porous lithiated NiO cathode used in molten carbonate fuel cells very often exhibit a linear shape over a wide potential range. It is shown by means of mathematical modelling that this linear behaviour can be explained by the interplay of intrinsic electrode kinetics, diffusion of electroactive species through an electrolyte film and the effective ohmic resistance of the pore electrolyte, providing that the cathodic transfer coefficient has a value of about 1.5. In contrast, with the generally assumed value of 0.5 of this transfer coefficient and with reasonable values of the effective electrolyte conductivity, predicted polarisation curves will always bend downwards over the overvoltage region of interest. The evolution of the polarisation curves with increasing electrolyte fill can be simulated by a model according to which the electroactive surface area becomes gradually blocked with the increasing amount of electrolyte.
Place, publisher, year, edition, pages
1997. Vol. 432, no 1-2, 121-128 p.
fuel cell, MCFC, gas diffusion electrodes, mathematical modelling, oxygen reduction, CARBONATE FUEL-CELLS, MOLTEN, REDUCTION, OXYGEN, ELECTRODE, PERFORMANCE, ANODE
IdentifiersURN: urn:nbn:se:kth:diva-12880ISI: A1997YC70200014OAI: oai:DiVA.org:kth-12880DiVA: diva2:319516
QC 201005182010-05-182010-05-182010-05-18Bibliographically approved