For large area SOFC testing I am using Scribner's test station. For the cell test I am using Ni-mesh and Ni wire as voltage send and current collector which is connected with the manifold using Ni-paste. So I found a large ohmic resistance (70~80%) of the cell compared to the total resistance while the polarization resistance is only 20~30%. So I doubt whether the position of the voltage send dose affect for high contact resistance. Please find the figure for the setup.
A large ohmic resistance of the cell compared to the polarization resistance could be due to the resistance of the electrolyte itself. You can reduce the effect of the electrolyte resistance by placing the current probe as close as possible to the cell.
Depending on the operating conditions, yes.
As Alexei V Ermakov suggests, reducing the ohmic drop caused by the electrolyte can help. Using a probe with a high surface area, or distributed to different points of the fuel cell is a good idea.
Jules
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