This work presents a modified TSR model of the nitric oxide/hydrogen fuel cell operating in potentiostatic mode with the co-current flow direction. The developed model accounts for the component and the energy balances in gas channels, liquid catholyte and catalyst layers together with charge balances at electrode/electrolyte interfaces. The simulation results indicate the influence of catalyst selectivity and mass transfer on the distribution of concentration, temperature and current density. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.