Calculation procedure for mass transfer in fuel cells

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Journal titleJournal of Power Sources
IssueApril 2
Pages185192; # of pages: 8
SubjectFuel cells; Transport phenomena; Mass transfer; Concentration polarisation; Over-potential; Diffusion
AbstractAn analysis of mass transfer losses, or concentration over-potentials in fuel cells is provided. An elementary theory, based on an equivalent film thickness, as proposed in some texts, is derived. This is followed by a more rigorous theoretical treatment of mass transfer theory, for which the mass transfer factor is obtained as a function of the driving force. The solution for the driving force is derived, for the well-known one-dimensional convection–diffusion problem. It is shown that mass transfer in planar and square geometries approximates this idealised situation. A linearised theory, appropriate for low mass flow rates is also presented. The methodology is illustrated using the simple example of a solid oxide fuel cell (SOFC). It is shown that the simplified theory is only applicable for very dilute binary mixtures. A step-by-step procedure for computing mass transfer in fuel cells is detailed, together with a discussion of the scope and range of application of the results.
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AffiliationNational Research Council Canada; NRC Institute for Chemical Process and Environmental Technology
Access conditionavailable
Peer reviewedYes
NRC number47886
NPARC number8925708
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Record identifier29b58b83-e7eb-43f4-9b7f-4b99db48801b
Record created2009-04-23
Record modified2016-05-09
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