Nickel-cermet anode-supported inicrotubular solid oxide fuel cells (SOFCs) based on a La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathode exhibit high power density at temperatures <= 650 degrees C. Current collecting is a major obstacle toward the integration of these single cells in a cube-shaped modules such integration would finally lead to a higher volumetric power density. This study aims to develop and modify current collectors for high performance in compact high power cube-shaped SOFC modules. The feasibility of using porous LSCF that has been infiltrated by Ag as a current collector for high performance SOFC modules is investigated. The well-dispersed Ag particles enhance the electrical conductivity and increase the thermal expansion coefficient of LSCF. Based on the oxygen content measured by thermogravimetry and the crystal structure analyzed by synchrotron X-ray diffraction, it appears that the enhancements of thermal expansion and electrical conductivity are related to the formation of oxygen vacancies and the increased covalency of the (Co, Fe)-O bond in LSCF respectively. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3184149] All rights reserved.