New PDF release: A detailed approach to model transport, heterogeneous

By Vinod Janardhanan

ISBN-10: 3866441843

ISBN-13: 9783866441842

This ebook lays out a numerical framework for the certain description of heterogeneous chemistry, electrochemistry and porous media shipping in solid-oxide gasoline cells (SOFC). Assuming hydrogen because the in basic terms electrochemically energetic species, a transformed Butler-Volmer equation is used to version the electrochemical cost move.

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Extra resources for A detailed approach to model transport, heterogeneous chemistry, and electrochemistry in solid-oxide fuel cells

Example text

Studied the C deposition effects on Ni/YSZ anodes at various YSZ dopant levels. They observed dissociative adsorption of methane (Eq. 23) and subsequent C deposition (Eq. 22) at temperatures above 780°C. [52]. Though open circuit conditions can result in detrimental C deposition at low S/C ratio, in certain cases the cell can be recovered by applying load [13]. It is worth mentioning that activity of YSZ as a reforming catalyst has also been reported in the literature [65]. Based on the study of bimetallics Lee et.

2 Fuel processing The main reason that SOFCs can run on hydrocarbons is the high temperature of operation. This high temperature is ideal for reforming reactions to produce electrochemically active synthesis gas (H2 and CO). The electrochemical activity of various chemical species is still a topic of open debate. However, there is no doubt on the electrochemical activity of H2 and CO [47, 48, 49]. Therefore, any fuel used in SOFC must be finally converted into H2 and/or CO to enable charge transfer reactions.

6) The symbols in the bracket stand for the corresponding surface to which the particular species is attached. For example H(Ni) stands for a hydrogen atom attached to Ni surface, and (Ni) represents a free Ni surface. O× (YSZ) is a lattice oxygen and V•• (YSZ) is an oxygen vacancy. The hydrogen adsorption desorption reaction also appears in the heterogeneous chemistry mechanism listed in Appendix. Although, in principle any of these reactions can be rate limiting, the work presented here follows the report of Zhu et al.

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A detailed approach to model transport, heterogeneous chemistry, and electrochemistry in solid-oxide fuel cells by Vinod Janardhanan


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