Anode-supported micro-tubular solid oxide fuel cells (SOFCs) based on a proton and oxide ion mixed conductor electrolyte, BaZr0.1Ce0.7Y0.1Yb0.1O3-delta (BZCYYb), have been fabricated using phase inversion and dip-coating techniques with a co-firing process. The single cell is composed of NiO-BZCYYb anode, BZCYYb electrolyte and La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF)-BZCYYb cathode. Maximum power densities of 0.08, 0.15, and 0.26 W cm(-2) have been obtained at 500,550 and 600 degrees C, respectively, using H-2 as fuel and ambient air as oxidant. (C) 2010 Elsevier B.V. All rights reserved.