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By G. Matthewson

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296. M. W. Scheffler, “Phosphoric Acid Fuel Cell Subsystem Technology Final Report,” GRI-88/0215, prepared by International Fuel Cells Corporation for GRI, Research Project FCR-9594, September 1988, p. 3-6, 3-9. 55 T. , 61(2), pp. 133-187, (1981) 56 R. J. M. N. 17, p. 310. W. , “Eighty Months of Commercial Experience with PC25 Fuel Cell Power Plant,” 1998 Fuel Cell Seminar Abstracts, Palm Springs, November, p. 27. , p. 28. H. R. G. S. Department of Energy under contract no. DE-AC21-94MC31166, November, 1998, p.

As previously described, the electrochemical reactions take place at the surface of the so-called three-phase zone in the electrode. The physical picture of this zone is depicted in Figure 2-7. To increase the current density (and thereby the cell power output), each of the polarizations must be addressed. Methods to reduce these polarizations include maximizing the number of contact sites, increasing the partial pressure of the reactant gases, and minimizing the diffusion pathways40. 2-9 Figure 2-7 Model of 3-Phase Zone in Cell Structure41 Reactant Utilization In general, increasing reactant gas utilization or decreasing inlet concentrations result in decreased cell performance due to increased concentration polarization and Nernst losses42.

Electrode performance generally decays slowly with operation. Performance decay is associated with sintering of Pt particles and obstruction of gas diffusion pores due to flooding of the catalyst layer by electrolyte and water22. Separator Plates The function of separator plates is to act as current collectors by providing the electrical connection between cells and (ii) to separate the reactant and oxidant gas streams in adjacent cells23. In some designs it also contains the gas channels for introducing the reactant gases and removing the products and inerts.

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Constructing an astronomical telescope by G. Matthewson

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