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the cell to seal the gap between the cell and the alumina cell holder. Figure 3: Exploded view of the INL test fixture used to support and seal the NASA 5 cm by 5 cm Solid Oxide Cells while providing steam flow & sweep gas flows. On the air-side of the cell, a gold mesh is placed in contact with the air-side electrode. This gold mesh is held against the air- side electrode by a gold plated current collector / air flow distributor fabricated from inconel plate. Air is introduced to the top side of the cell through a gold plated inconel inlet tube welded to the current collector / air flow distributor plate. The air inlet tube is double walled in order to serve its second purpose, which is the conduction of electrical current to/from the SOEC air-side electrode. The airflow distributor has an array of square protuberances milled into its surface (see Figure X), creating a gap for airflow while also compressing the gold mesh against the air-side electrode. Several air outlet holes are distributed in the center of airflow distributor. After exiting the airflow distributor, the air impinges on the cathode side of the cell and flows radially outward through the array of protuberances. After sweeping the air-side electrode, the air exits into the furnace volume. An airside electrode voltage tap wire, insulated by alumina tubing and beads, is spot welded to the airflow distributor and runs alongside the air inlet tube/current collector and out of the furnace hot-zone for connection to the test stand data acquisition system. Figure 4: Overview of the 5 cm by 5 cm cell test fixture and hot-zone apparatus. A fixed compressive load is applied to the entire cell stack up between the alumina cell holder and an alumina load tube/inconel pusher plate by means of weights, as shown in Figure 2. This load simultaneously compresses the cell against the nickel mesh, flow field and foil on the bottom steam/hydrogen side of the cell and against the gold mesh on the air side. It also compresses the cell against the seal around the outer edge of the cell which rests on the shelf milled into the alumina cell holder. The HastX weight plates are held in alignment by the upper portion of threaded rods which extend upward from the base of the test fixture for this purpose. A fixed compressive load is independently applied between the 4PDF Image | Electrolysis Cells Operated Fuel Cell Steam Electrolysis
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