The ohmic resistance of anode-supported solid oxide fuel cells having a manganese-based cathode was lowered when operated in synthetic coal gas containing hydrogen chloride. This effect was not observed for cells with cathodes that did not contain manganese. Substantial amounts of Mn were found throughout the grain boundaries of the 8 mole% yttria-stabilized zirconia (8YSZ) electrolyte. Exposure to HCl partially removed Mn near the anode/electrolyte interface, presumably by volatilization as MnCl2(g). This work suggests that one of the underlying causes of higher than expected electrolyte resistance in anode-supported SOFCs is a lowering of the ionic conductivity of 8YSZ by incorporation of manganese.
Revised: July 13, 2010 |
Published: April 9, 2010
Citation
Marina O.A., L.R. Pederson, E.C. Thomsen, D.J. Edwards, C.A. Coyle, and C.N. Cramer. 2010.SOFC Ohmic Resistance Reduction by HCl-Induced Removal of Manganese at the Anode/Electrolyte Interface.Electrochemical and Solid-State Letters 13, no. 6:B63-B67.PNNL-SA-71023.doi:10.1149/1.3380668