Polymer electrolyte membranes electrical characterisation

Kleemann J, Finsterwalder F, Tillmetz W (2009) Characterisation of mechanical behaviour and coupled electrical properties of polymer electrolyte membrane fuel cell gas diffusion layers. J Power Sources 190 92-102... 

FIGURE 5.4 Calculated electrical conductivity as a function of applied compressive load. The values were calculated based on the data reported by Kleemann et al. (2009). (Reprinted from the Journal of Power Sources, 190, Kleemann, J., Finsterwalder, F., and Tillmetz, W. Characterisation of mechanical behaviour and coupled electrical properties of polymer electrolyte membrane fuel cell gas diffusion layers. Selected Papers presented at the 11th ULM Electrochemical Days, 92-102, Copyright (2009), with permission from Elsevier.)... 

The maximum power of fuel cells H2/O2 and CH3OH/O2 with a membrane based on polymer complexes PBI/H3PO4 [7] was as high as 0.25 W cm at a current density of 700mAcm . The electrical resistance of electrolyte membranes was 0.4 the thickness and surface area of the membranes were 0.01 cm and 1 cm, and the doping level was 500 mol%. The measured electrical resistance of the cell was equivalent to a conductivity of 0.025 S cm It was found that the electrical resistance of the fuel cell is independent of the water content in the gas (water produced at the cathode is sufficient for maintaining the necessary conductivity of the electrolyte). This type of fuel cell was characterised by continuous operation at a current density of 200 mA cm over a period of 200 h (and for longer time periods) without reduction of the membrane performance. 

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