D206 メゾスケール構造を有する燃料極支持型SOFCの発電特性に関する数値シミュレーション(OS4 水素・燃料電池),動力エネルギーシステム部門20周年,次の20年への新展開)

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We investigate the use of mesoscale-structure control, i.e., at a size range of 10-100 μm, on the electrode/electrolyte interfaces of a solid oxide fuel cell to enhance its power density. Such structure enlarges the electrode/electrolyte interface area, and influences the cell performance. We focus on applying the mesoscale-structure control to an anode supported cell, and adopt a rectangular wave-shaped electrolyte as the mesoscale structure. A 2-D numerical simulation of the cell with mesoscale structure by using an equivalent electrical circuit model, dusty-gas model, and random packing model is carried out to clarify its effect. The ohmic loss of ionic conduction and activation overpotential are decreased by mesoscale-structure control, and consequently total overpotential is reduced by 12%. It confirms that the cell performance is enhanced by the mesoscale structure. The electrochemical reaction distribution in electrodes is mostly caused by the ion potential distribution due to the rectangular wave-shaped electrolyte.
2010-06-20