| Summary: | 碩士 === 元智大學 === 機械工程學系 === 93 === This study is focused on the design and evaluation of the solid oxide fuel cell (SOFC) based on asymmetric membrane electrode assembly (MEA). In the beginning, the planar SOFC single cell is built and its performance is evaluated. We found that the ohmic resistance can be decreased with proper pressing between stainless steel current collector and MEA. In addition, the reduction of NiO within anode to Ni under dilute H2 environment also further decreases the ohmic resistance. The decrease of ohmic resistance results in higher performance. Meanwhile, increasing the cell temperature promotes the cell performance due to lower electrolyte resistivity and higher electrode activities as expected. Based on the experience built on the single cell, two-cell stack were further built and its performance is also evaluated. By properly distributing the air and dilute H2 to corresponding parts with proper sealing, the voltage doubles at a certain current density comparing to the single cell. However, the cell performance decays after long-term operation probably due to cathode poison from the Cr oxide formed on the stainless steel current collector.
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