Abstract
In this paper, the power generation characteristics of a small tubular solid oxide fuel cell (SOFC) are investigated, particularly we focus on the effects of steam addition to fuel flow on the cell performance. In the experiments, the single cell is placed in the electric furnace and hydrogen and nitrogen mixture, of which volume ratio (H_2/N_2) is 10%/90%, is supplied to the inside of the cell tube (anode side) as fuel. The temperature of furnace is controlled to keep constant at 800℃. In the case of wet condition, steam is added in the fuel flow, and the mole fractions of steam to hydrogen are set in the range from 0.159 to 0.173. It is found that the operating voltage in the wet fuel condition is smaller than that in the case without steam. The difference of voltage between wet and dry operations is increase with current increasing. It is likely that this characteristics depend on the concentration and activation overpotential caused by the decrease of mass transfer rate. In addition, it is clarified that the maximum power output values of steam addition cases fall approximately 40% to the results of dry conditions.
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