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Anode-supported micro-tubular solid oxide fuel cells (SOFCs) based on a proton and oxide ion mixed conductor electrolyte, BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3−δ (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 La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF)–BZCYYb cathode. Maximum power densities of 0.08, 0.15, and 0.26Wcm⁻² have been obtained at 500, 550 and 600°C, respectively, using H₂ as fuel and ambient air as oxidant.