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An annular micro-stack array consisting of four fuel cells has been fabricated and operated successfully in single-chamber conditions using a nitrogen-diluted oxygen-methane mixture as the operating gas. The single cells consist of a state-of-the-art porous NiO/Y(2)O(3)-stabilized ZrO(2) (YSZ) anode support, a YSZ electrolyte membrane and a modified La(0.7)Sr(0.3)MnO(3) (LSM) cathode. The annular configuration of the array is favorable for utilizing the heating effect. The maximum power output of the annular stack decreases with increasingCH(4)/O(2) ratio. Its performance increases with increasing CH(4) flow rate and decreases with increasing N(2) flow rate. The power output of the stack is similar to 380 mW at CH(4)/O(2)=1 and an N(2) flow rate of 100 sccm and the average maximum power density of each cell is similar to 190 mW cm(-2). The average performance of each cell in the annular micro-stack array is higher than that of an additional single cell placed next to the stack. (C) 2010 Elsevier B.V. All rights reserved.