Cobalt-free perovskite Ba0.5Sr0.5Fe0.9Mo0.1O3-delta (BSFMo) was investigated as a single-phase cathode for intermediate-to-low-temperature solid oxide fuel cells (IL-SOFCs). The X-ray diffraction (XRD) Rietveld refinement, electrical conductivity, thermogravimetric (TG) measurements, the phase reaction were investigated. The doping of high-valence Mo cations into Fe-site obviously enhanced the electrical conductivity of BSFMo sample with the maximum value of 174 S cm(-1). XRD results showed that BSEMo cathode was chemically compatible with the BaZr0.1Ce0.7Y0.1Yb0.1O3-delta (BZCYYb) electrolyte for temperatures up to 1000 degrees C. Laboratory-sized tri-layer cells of NiO-BZCYYb/BZCYYb/BSEMo were operated from 550 to 700 degrees C with humidified hydrogen (similar to 3% H2O) as fuel and the static air as oxidant, respectively. An open-circuit potential of 1.001 V, the maximum power density of 428 mW cm(-2), and a low electrode polarization resistance of 0.148 Omega cm(2) were achieved at 700 degrees C. The experimental results indicated that the single-phase BSFMo is a promising candidate as cathode material for IL-SOFCs. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.