This paper investigates experimentally and analytically the effect of pressurization on the anodic concentration polarization of a planar anode-supported full cell with flow distributors in both anode and cathode using a recently-established high-pressure dual-chamber SOFC test facility. In it the power generating characteristics and electrochemical impedance spectra of such single-cell are measured at constant flow rates (anode: 0.5 slpm H-2 + 0.4 slpm N-2; cathode: 0.9 slpm air) and at a fixed operating temperature (T = 800 degrees C) but with five different pressures (p) varying incrementally from to 1 atm to 5 atm. Measurements show that the high frequency arcs of impedance spectra decrease rather weakly with increasing p, while the low frequency arcs with characteristic frequencies occurring at about 0.5 similar to 1 Hz decrease strongly with increasing p. It is found that the ohmic resistance is independent of p, but the polarization resistance and the calculated anodic concentration overvoltage decrease noticeably with increasing p. (C) 2014 The Electrochemical Society. All rights reserved.