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In this ebook famous specialists spotlight state-of-the-art study priorities and talk about the state-of-the-art within the box of stable oxide gasoline cells giving an replace on particular topics akin to protonic conductors, interconnects, electrocatalytic and catalytic strategies and modelling approaches.Fundamentals and advances during this box are illustrated to assist younger researchers deal with matters within the characterization of fabrics and within the research of tactics, infrequently tackled in scholarly books.
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Extra resources for Advances in Medium and High Temperature Solid Oxide Fuel Cell Technology
This tells us two things: ﬁrstly, the thermodynamical efﬁciency of high-temperature fuel cells is deﬁnitely lower than that of low-temperature fuel cells due to the additional entropy the higher temperature introduces; secondly, in exploiting the full potential of the fuel cell, the higher heating value (HHV) should be the point of reference and efforts should be made to fully use the latent heat stored in the water vapour. This is something often not considered in fuel cell system engineering.
2), but the insigniﬁcant utilization makes this value incomparable to ASR derived from experiments with high fuel utilization, because the concentration polarization resistance due to the fuel and air conversion can be a considerable fraction of the total cell resistance. Thus, it is, in general, necessary to specify also the fuel and oxygen utilization together with temperature and apparent activation energy. 1 %, this changes the H2O/H2 ratio by a factor of 2, which in turn changes the Emf by 34 mV at 850 °C.
15 A sketch of the influence of gas impurities in durability test of cells in electrolysis mode. The as provided gas contained a few ppb of sulfur (about the detection limit), and the other gas was cleaned using a scrubber of hot Ni–YSZ electrode powder. , TEM (Hauch et al. 2008). An example of how to test for—and the effect of—impurities coming from a fuel electrode gas stream is presented in Fig. 15. The as-provided-gas was analyzed by gas chromatography, but only sulfur with a concentration just about the detection limit of ca.