By Vinod Janardhanan
This booklet lays out a numerical framework for the exact description of heterogeneous chemistry, electrochemistry and porous media delivery in solid-oxide gasoline cells (SOFC). Assuming hydrogen because the basically electrochemically lively species, a changed Butler-Volmer equation is used to version the electrochemical cost move.
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This ebook lays out a numerical framework for the exact description of heterogeneous chemistry, electrochemistry and porous media shipping in solid-oxide gasoline cells (SOFC). Assuming hydrogen because the simply electrochemically lively species, a transformed Butler-Volmer equation is used to version the electrochemical cost move.
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Additional info for A detailed approach to model transport, heterogeneous chemistry, and electrochemistry in solid-oxide fuel cells
The amount of energy requires to drive the electrons depend on the relative potential difference between the anode and the electrolyte. The electric potential of the anode is always lower than that of the electrolyte. e. making it less negative). At equilibrium anode eleceq trical potential difference Eaeq = φeq a − φe,a the reaction proceeds in the anodic and cathodic direction at equal and opposite rates. The activation overpotential ηa is the potential difference exceeding the equilibrium potential difference between the anode and the electrolyte.
Excerpting the potential of elementary heterogeneous chemistry for steam reforming of CH4 on Ni, this dissertation explores the performance of SOFCs under internal reforming conditions. The elementary mechanism is thoroughly validated for SOFC operating conditions by specially designed experiments carried out at Colorado School of Mines. Validity of electrochemical model parameters is ensured by comparison with experimental data. The work also explores various porous media transport models and Aim of current study 9 their validity for application in fuel cell anodes.
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. The fuel processing can be achieved either internal or external to a fuel cell stack . Using external reformer, however, results in extra cost added to the overall system and hence internal reforming is a very attractive option.