Correlating sulfur poisoning of SOFC nickel anodes by a temkin isotherm

Abstract

Experimental data on sulfur's impact on solid oxide fuel cell (SOFC) nickel anodes have been analyzed using an isotherm for the sulfur coverage on the Ni surface: θS =1.45-9.53× 10-5 T+4.17× 10-5 T ln Y, where Y is the ratio between the partial pressures of hydrogen sulfide and hydrogen. The loss of performance, Pl, of the SOFC can be correlated by Pl = k* (θS - θmin), where θmin >0 depends on the current density and anode material. The data range covered is 700-1000°C, concentration of hydrogen sulfide 0.05-50 ppm. © 2008 The Electrochemical Society. All rights reserved.