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: θ s = 1.45 - 9.53 X 10 -5 T+ 4.17 X 10 -5 T ln Y, where Y is the ratio between the partial pressures of hydrogen sulfide and hydrogen. The loss of performance, P l , of the SOFC can be correlated by P l = k*(θ s - θ min ), where θ min > 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.