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This can be attributed to lower diffusion (concentration) polarization at the cathode and an increase in the theoretical cell potential. Also, activation polarizations at the cathode are also reduced due to the increased partial pressures of oxygen and water. The increase in water partial pressure is significant because it affects the acid concentration which results in a concomitant rise in ionic conductivity38. As cell temperature increases, the reversible cell potential decreases. However, in most fuel cells, this thermodynamic disadvantage is typically offset by reductions in cell polarizations due to improved reaction kinetics.
94. 15 R. J. M. N. Mugerwa, Plenum Press, New York, NY, 1993, p. 306. , p. 309. 17 K. Kordesch and G. Simader, Fuel Cells and Their Applications, VCH Publishers, New York, NY, 1996, p. 97. 18 R. J. M. N. Mugerwa, Plenum Press, New York, NY, 1993, p. 303. 19 Ibid. , p. 305. 21 Ibid. 22 Ibid. 23 K. R. J. S. Department of Energy under Contract DE-AC03-76F00098, May 1988, pp. 37-53. 24 R. J. M. N. Mugerwa, Plenum Press, New York, NY, 1993, p. 301. , p. 309. D. R. Dunbar, “Phosphoric Acid Fuel Cell Technical Report,” Center For Energy Studies, Marquette University, Milwaukee, WI, 1993.
Each fuel cell technology has its advantages and given the ever-increasing electric capacity demands, they may all find a market niche. 2-19 Table 2-4 Comparison of 200 kWe PC25 Emissions vs. W. , “Eighty Months of Commercial Experience with PC25 Fuel Cell Power Plant,” 1998 Fuel Cell Seminar Abstracts, Palm Springs, November, p. 24. H. R. G. S. Department of Energy under contract no. DE-AC21-94MC31166, November, 1998, p. 1-15. 3 R. J. M. N. 285-288. S. Kemp, “ On-Site Fuel Cell Power Plant Technology and Development Program Annual Report-1984,” GRI85/0195, prepared by United Technologies Corp.