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Estimation of Limiting Current Density

In order to derive the limiting current density, let us equate the net mass transfer rate of a reactant gas given by Equation 6.102 and the gas consumption rate based on the current density as follows  [Pg.269]

Equation 6.127 can also be used to estimate the reactant gas concentration [Pg.269]

Notice that in situations where net mass transfer resistance is controlled by the diffusion resistance in the electrode-gas diffusion layer only, the reactant gas concentration at the reaction surface is given as [Pg.269]

Equating 6.127 for the current density as a function of reactant gas concentration [Pg.269]

Equation 6.80 shows that the current density depends directly on the reactant gas concentration in the channel as well as the reactant gas concentration at the electrode-electrolyte interface. The current density increases with higher gas concentration, Q in the channel and lower concentration, Q i, at the reaction surface. For a given electrode-gas diffusion layer and gas channel design with a fixed Q value, the maximum current density or the [Pg.269]


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