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Table 7-4 Recent Technology Advances on Planar Cells and Potential Benefits Technology Advance Potential Benefit Design Electrode supported thin electrolyte unit cells – e.g., anode • Lower resistance of electrolyte • Increased power density System Lower temperature of operation • Use of metallic Interconnects and manifolding possible Materials Metallic interconnect plates • Lower cost • Lower resistance interconnect • Mechanical solution to thermal expansion of stack Materials More conductive electrolyte materials: Sc – Zr Oxides Ce – Gd Oxides • Reduced voltage drop across electrolyte An example of a stack geometry is shown in Figure7-22a (68). The cassette-type repeat unit with a plain rectangular ceramic cell, a metal picture frame with cavities for manifolding, and a matching separator plate is not uncommon among developers of planar anode-supported SOFC with metal interconnects. Units such as the one shown typically result in a pitch of 5 to 10 unit cells per inch. The bipolar plate has several functions, including providing a gas barrier between the anode and cathode, providing a series electrical connector between the anode and cathode, and flow field distribution. Individual cell assemblies, each including an anode, electrolyte, and cathode are stacked with metal interconnecting plates between them. The metal plates are shaped to permit the flow of fuel and air to the membranes. The electrolyte and interconnect layers are made by tape casting. The electrodes are applied by the slurry method, by screen-printing, by plasma spraying, or by tape-casting/tape calendaring. Fuel cell stacks are formed by layers of unit cells, much like other fuel cell technologies. Tests of single cells and two-cell stacks of SOFCs with a planar configuration (5cm diameter) have demonstrated power densities up to 1.8 W/cm2 (Figure 7-23) under ideal conditions. 7-36PDF Image | Fuel Cell Handbook (Seventh Edition)
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