The catalytic activity of highly porous Ru/Se/C-based catalysts was investigated. Fuel cell measurements were carried out in a 5 cm(2) cell using pure hydrogen and oxygen at a temperature of 75 degrees C and ambient pressure. Maximum power densities of 100, 144 and 150 mW cm(-2) were observed for membrane electrode assemblies (MEA) containing of 0.04,0.12 and 0.22 mg cm(-2) ruthenium, respectively. The catalysts were further characterized by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). (C) 2008 Elsevier B.V. All rights reserved.