Microtubular (MT) geometry of solid oxide cells have a number of distinctive properties, such as high volumetric power density, thermocycling stability and fast start-up capability. In this study, we evaluate the performance of the MT cell with LNO-SDC as air electrode under both fuel cell and electrolysis cell mode operation. While working in the fuel cell mode, the maximum power densities of MT cell reached 533, 740 and 792 mW cm-2 at 750, 800 and 850 °C, respectively. Moreover, the MT cell exhibit excellent long-term stability with no critical performance degradation operating at 750 °C. In the electrolysis mode, current density at 800 °C reached value of 780 mA cm-2 under applied voltage of 1.3 V with fuel gas containing 30 % H2O. The results on CO2 electrolysis indicate remarkable efficiency of studied MT cell with current density of 854 mA cm-2 at an applied voltage of 1.5 V.