The Meaning of Polurization Curve

In electrochemistry, polarization is a collective term for certain mechanical side-effects (of an electrochemical process) by which isolating barriers develop at the interface between electrode and electrolyte.

So How about the Curve?

The polarization curve does not have a lot of specificity; however, it is one of the most common methods of testing a fuel cell. It also allows an easy comparison to other published polarization curves. The polarization curve displays the voltage output of the fuel cell for a given current density loading. Polarization curves are usually obtained with a potentiostat/galvanostat, which draws a fixed current from the fuel cell and measures the fuel cell output voltage.