Effect of Oxygen Concentration on Current Density Distribution in the Land-Channel Direction
In our previous studies, we have measured the current density distribution in the land-channel geometry at 340 µm resolution and found that in a wet condition, current densities are higher in channel areas than in land areas [2-3].
In this work, we are going to present current density distribution as a function of oxygen concentration in the land-channel direction. This method can be used to obtain local polarization curves at 35 degree C and 100% RH (see attached Figure) under the land and channel. Subsequently, it will be used to measure local limiting currents and can be used to resolve oxygen diffusion resistance distribution in the land-channel direction. Similarly, using hydrogen pumping, in low hydrogen concentration effect of land-channel geometry on the current density distribution can be analyzed.
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