The syngas, H-2 + CO gas mixture with various H-2/CO ratios, is used as the anode fuel of solid oxide fuel cell with La0.7Ag0.3Co0.2Fe0.8O3 (LACF) and 2 wt% Ag-added La0.58Sr0.4Co0.2Fe0.8O3 (LSCF) as the anode, respectively, both being in composite with 50 wt%Ce0.9Gd0.1O1.95 (GDC). Both the current-voltage and the fixed-voltage measurements are performed at 800 degrees C. The reactivity with H-2 as the fuel is larger than that with CO. The syngas reactivity increases with increasing H-2 content. The results of the current-voltage and the fixed-voltage measurements are in agreement with each other. Ag-added LSCF-GDC has better reactivity with H-2, CO and syngas and better stability in the H-2 atmosphere than LACF-GDC as the anode material. (C) 2010 Elsevier B.V. All rights reserved.