Bipolar single-component

In comparison to single-component films, bipolar semiconducting blends are much more challenging. The necessity to have percolation networks for both electrons and holes, each one conducted by one component of the blend, imposes strict requirements for the supra-molecular organization of the two materials. On one side an extended intermixing of the two semiconductors at the molecular level will... 

Schematic indication of unit (single) cell components, including bipolar plates, and the relationship between the unit cell and cell row or multiple-cell stack. (Reprinted with permission from Costamagna, P. and S. Srinivasan. 2001. Journal of Power Sources 102 242-252.)...

Fig. 2. Components of a single polymer electrolyte fuel cell used for laboratory investigations. In a stack, relatively thinner current collectors will become bipolar plates with the flow fields machined on both sides.

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